Microsoft windows smb null session authentication vulnerability. The ...

Microsoft windows smb null session authentication vulnerability. The CVA course focuses on foundational information such as the importance of a Vulnerability Assessment and how it can help an engineer prevent serious break-ins to your organization 40/guest get file This Metasploit module will intercept direct SMB authentication requests to another host, gaining access to an authenticated SMB session if successful If this policy is enabled, the SMB CVE-2016-7237CVE-MS16-137 115 NetBIOS enumeration: Checklist Vulnerability Categories 10394 (1) - Microsoft Windows SMB Log In Possible Synopsis It was possible to log into the remote host 91 Consider one solution—disabling the bindings between the TCP/IP and NetBIOS layers of networking 93 The smb-vuln-regsvc-dos - An elevation of privilege vulnerability exists in Windows due to Kerberos falling back to NT LAN Manager (NTLM) Authentication Protocol as the default authentication protocol A null session is access without a user -name Level 2 – Send NTLM response only This post will cover 11 common internal network security misconfigurations and fixes to get you started AD hardening If the permissions are not audited, it is possible that any member of the network Enforce Strong Password Policy Objectives Describe the tools available to assess Microsoft system vulnerabilities Describe the vulnerabilities of Microsoft operating systems Describe the vulnerabilities of services running on Microsoft operating systems Explain techniques to Microsoft network server: Amount of idle time required before suspending session Because they didn't have to authenticate to a user account just to see if you're hosting any file shares to help you perform penetration tests 18% SMB NULL SESSION AUTHENTICATION A server with Microsoft Windows where is it possible to log into it using a NULL session E Linux and macOS implementations of SMB typically use Samba 2) Select an option profile Procedure : If you are a system admin , Login to the Windows Server with admin rights and on run Prompt ,type gpedit The C)VA is a fundamental cybersecurity certification course that focuses on vulnerability assessments For the Relevance Rule Pattern MS17-010-SMB_REMOTE_CODE_EXECUTION_EXPLOIT*, if the traffic direction is 'Incoming', the source is the 'Remote IP' and vice versa introduction of Active Directory - The port range scanned , firmware) that, when exploited, results in a negative impact to confidentiality, integrity, OR availability Microsoft Windows SMB NULL Session Authentication: Low Severity problem(s) found: 26917: 2: Microsoft Windows SMB Registry : Nessus Cannot Access the Windows Registry: Low Severity problem(s) found: 25701: 1: LDAP Crafted Search Request Server Information Disclosure: Low Severity problem(s) found: 25240: 1: Samba Server Detection: Low Severity Name ; On the right side table select Security You can also quickly identify any SMB null sessions The leak included many exploitation tools like EternalBlue that are based on multiple vulnerabilities in the Windows implementation of SMB protocol Vulnerability If this setting is Enabled, when a service connects with a NULL session, a system-generated session key is created, which provides no protection but allows applications to sign and encrypt data without errors It is possible to log into it using a NULL session (i Exploit Smb [MOHD9L] The bug could let an attacker exploit the way SMBv3 handles requests to run code on a target On successful authentication, the domain controller returns the UserSessionKey back to the server The name Samba comes from SMB (Server Message Block), the name of the standard protocol used by the Microsoft Windows SMB NULL Session Authentication Data that is intended to be protected might be exposed 35 - PHP Multiple Vulnerabilities - 01 - Mar16 (Linux) 2 When you open the file in Microsoft Excel, you can convert the text to columns This Metasploit module will relay SMB authentication requests to another host, gaining access to an authenticated SMB session if successful 70003 Null Session/Password NetBIOS Access 70004 NetBIOS Bindings Information 8zb The dilemma in dealing with null sessions is that Windows NT, to some degree, depends on them This could also be caused when SMB null session are disabled but this is unlikely on Windows XP CVE-2006-1184 1010317* - Microsoft Windows SMB Remote Code Execution Vulnerability (CVE-2020-1301) 1005448* - SMB Null Session Detected - 1 DCERPC Services - Client 1010106* - Identify Downloading Of PowerShell Scripts Through SMB Share (ATT&CK T1086) DNS Client 1003328* - Disallow Intra-Site Automatic Tunnel Addressing Protocol The SMB Server service in Microsoft Windows XP SP2 and SP3, Windows Server 2003 SP2, Windows Vista SP1 and SP2, Windows Server 2008 Gold, SP2, R2, and R2 SP1, and Windows 7 Gold and SP1 does not properly validate fields in SMB requests, which allows remote attackers to execute arbitrary code via a malformed request in a (1) SMBv1 or (2) SMBv2 Digitally signed SMB packets aid in preventing man-in-the-middle attacks MS-EFSR is Microsoft's Encrypting File System Remote protocol - The port scanner (s) used 9 displays But, what I love is the raw power SMB provides for manipulating Windows environments during a penetration test SMB is an application layered protocol that uses TCP Port 445 to communicate This is only enabled by default in Windows 2000 and older versions bydefault, although SMB can still be configured to use null sessions with newer operating systems it may be possible for unauthenticated remote attackers to leverage this vulnerability to gain information about the remote host The SMB Server service in Microsoft Windows XP SP2 and SP3, Windows Server 2003 SP2, Windows Vista SP1 and SP2, Windows Server 2008 Gold, SP2, R2, and R2 SP1, and Windows 7 Gold and SP1 does not properly validate fields in SMB requests, which allows remote attackers to execute arbitrary code via a malformed request in a (1) SMBv1 or (2) SMBv2 last seen: 2020-03-18 no The Windows domain to use for authentication SMBPass no The password for the specified username SMBUser no The username to authenticate as STOP_ON_SUCCESS false yes Stop guessing when a credential works for a host THREADS 1 yes The number of concurrent threads USERPASS_FILE no File containing users and passwords separated by space, one pair per line Vulnerability; Microsoft Windows Authenticated User Code Execution Vulnerability (CVE-1999-0504) Microsoft Windows Authenticated User Code Execution Vulnerability (CVE-1999-0504) Publish date: July 21, 2015 python3 butcher g An attacker could repeatedly establish SMB sessions until the server's SMB services become slow or unresponsive An attacker may use this feature to gain better knowledge of the remote host ['SecurityBlobLength'] = 0 # this is OEMPasswordLen field in another format AVDS is alone in using behavior based testing that eliminates this issue V-205828: Medium: Windows Server 2019 setting Microsoft network server: Digitally sign communications (if client agrees) must be configured to User level of security asks for username/passwd in windows while if you keep the security = share it wont ask for credentials or can access share without password Using this tool, first let us see the users of the SMB service Dependiendo de la configuración, es posible que un atacante remoto no autenticado aproveche este problema para obtener Windows network administrators may be dismayed to find that winbind exposes all domain users so that they may use their domain account credentials to log on to a UNIX/Linux system User Account Control: Virtualize file and registry write failures to per-user locations – Enable On March 10, 2020 we are addressing this vulnerability by providing the following options for administrators to harden the configurations for LDAP channel binding on Active Directory domain controllers: Domain controller: LDAP server channel binding token requirements Group Policy CIFS NULL Session Permitted: SoftNAS is designed to allow anonymous access by default Share-level authentication: The anonymous account should be used to A null session implies that access to a network resource, most commonly the IPC$ "Windows Named Pipe" share, was granted without authentication " Description Windows systems have hidden network shares that are accessible only Open terminal and type command “ enum4linux -U 192 , code) found in software and some hardware components (e 2006-05-09 1; Windows Server 2012 Gold and R2; Windows RT 8 EternalBlue works on all Windows versions prior to Windows 8 Script Summary The CVA Cybersecurity Training Course focuses on foundational information such as the importance of a Vulnerability Assessment and how it can help an engineer prevent serious break-ins to your organization Null session vulnerability is disabled on fresh Windows 2008 and earlier versions Disabled CVE-2003-1491, CVE-2004-1473 1 This would only impact a Unitrends system if it were leveraging Windows authentication A Null Session is defined as the unauthenticated sessions of the Server Message Block, which forms the core network protocol of the Windows OS Server Message Block sessions User Account Control: Switch to the secure desktop when prompting for elevation – Enable [Update 2018-12-02] I just learned about smbmap, which is just great Enumerates the users logged into a system either locally or through an SMB share Level 1 – Use NTLMv2 session security if negotiated Step 2 : Update the none Known exploit for "Microsoft Windows SMB/NETBIOS NULL Session Authentication Bypass Vulnerability" 3-encrypted tunnel over the internet-friendly UDP port 443 instead of the legacy TCP port 445 By default, Windows NT systems at least restrict the 構成によって異なりますが、認証されていないリモート攻撃者が、この問題を利用して、リモートホスト It’s possible that by having this set up, someone could log into the system with the #enum4linux -U 192 Other options include admin$ and C$ Connections to a SMB share are, for example, people connected to fileshares or making RPC calls See the images below for more information 15 is required: 33 - Microsoft Windows SMB/NETBIOS NULL Session Authentication Bypass Vulnerability 2 25 *3 = False positive BugTraq is a full disclosure mailing list for the detailed discussion and announcement of computer security vulnerabilities NULL The most common command to use when enumerating Windows ahares is nbtstat SMB is a legacy protocol used to share files and printers across local networks The SMBv1 server in Microsoft Windows Vista SP2; Windows Server 2008 SP2 and R2 SP1; Windows 7 SP1; Windows 8 , with no login or password) How to request CVE; Data storage By default security = user option will be enabled under Standalone Server option module in Windows that allows a null session to be established 0” SMB vulnerability history At the time of publication there is no known decryption method The screen shown in Figure 3 To disable NetBIOS over TCP/IP, click the plus sign next to NetBIOS Interface, select For server operating systems: Open Server Manager and then click the Manage menu and select Remove Roles and Features Domain, session Key, MIC, etc) with a long string (80-140 chars), leading LSASS 4) Double-click on LMCompatibilityLevel in the In what format are Windows and Linux hashes stored: (or the Guest account must be enabled) Again, we rate remote authenticated code execution vulnerabilities as “Important” The password is first hashed based on the LANMAN/NTLM mechanism 0 (SMBv1) server handles certain requests, aka 'Windows SMB Remote Code Execution Vulnerability' scan itself : - The version of the plugin set 0) 26920: Microsoft Windows SMB NULL Session Authentication: Medium (5 - Remove the share Included in updates: Unitrends security updates enable server signing, as shown in /etc/samba/smb As per Microsoft’s blog post on Exchange Server 0day use by the HAFNIUM actors, CVE-2021-26857 is a deserialization vulnerability in Exchange Server’s Unified Messaging (voicemail) service 説明 Active Directory Attacks リモートホストが Microsoft Windows を実行しています。 The kernel in Microsoft Windows 2000 SP4, XP SP2 and SP3, Server 2003 SP2, Vista Gold, SP1, and SP2, and Server 2008 Gold and SP2 does not properly validate a registry-key argument to an unspecified system call, which allows local users to cause a denial of service (reboot) via a crafted application, aka "Windows Kernel Null Pointer Vulnerability Seeing the output from Nmap, we can see some of the scripts failed (most likely because it was not vulnerable), but we do see that it found one vulnerability which is smb-vuln-ms17-010 An information disclosure vulnerability exists in Microsoft SharePoint when an In the “Available Options” frame, select and check the box “001 Microsoft Disable Netbios Option” The Server Message Block (SMB) Protocol is a network file sharing protocol, and as implemented in Microsoft Windows is known as Microsoft SMB Protocol Two applications start a NetBIOS session when one (the client) sends a command to “call” another client (the server) over TCP Port 139 The plugin text would have all the details Tenable provides, including a recommended fix, as well as external references The Exploit Database is a non-profit project that is provided as a public service by Offensive Security Examples of the use of this key are generating the keys needed to signing SMB packets, and the keys needed for encryption/decryption of SMB sessions It performs maintenance and management operations on encrypted data that is stored remotely and accessed over a network (docs By default, SMB is configured to use the ports 139 and 445 Depending on the configuration, it may be possible for an unauthenticated, remote attacker to leverage this issue to get information about the remote host It was possible to log into it using one of the following accounts : - NULL session - Guest account - Supplied credentials See Also Target network port (s): 139, 445 Server Message Block provides file sharing, network browsing, printing services, and interprocess communication over a network This protocol was prone to plethora of attacks from SMB Null Sessions to Eternal Blue Be thoughtful on the network you 0) 56210 Microsoft Windows Windows 7/2008 R2 - 'EternalBlue' SMB Remote Code Execution (MS17-010) Stealing Windows credentials exploiting a Microsoft Outlook flaw Description : The remote host is running one of the Microsoft Windows operating systems Set up SMB 3 The CVA course focuses on foundational information such as the importance of a Vulnerability Assessment and how it can help an engineer prevent serious break-ins to Remote and Authenticated Well for one, Windows exposes several administrative and hidden shares via SMB by default Note: Microsoft Windows uses SMB, and Unix/Linux systems use CIFS If the Guest account is enabled, anyone can access the computer without a valid user account or password APT2 is an open source, multi threaded and automated toolkit which uses tools like Nmap, Metasploit, etc CIS - Reference number in the Center for Internet Security Windows Server 2016 Benchmark v1 Open "Microsoft SQL Server Management Studio" 3 Microsoft Windows XP Unsupported Installation Detection Medium (5 They both compute a session key by mixing both challenges with the shared A little over a year ago, the SANS Institute and the National Infrastructure Protection Center (NIPC) released a document summarizing the Ten Most Critical Internet Security Vulnerabilities This module exploits a denial of service vulnerability in the SRV In the CVA course, the student will be versed with basic Null sessions could be used to gather more information about the host and its network, or to access data stored in shares that allow this type of authentication Most usage of SMB involves computers Every vulnerability is mapped to a vulnerability category (extracted from here) 1 This vulnerability is different from those described in CVE-2017-0144, CVE-2017-0145, CVE-2017-0146, and CVE-2017-0148 V-225043: Medium: The setting Microsoft network server: Digitally sign communications (if client agrees) must be configured to Enabled In this case, the remote host is running a Microsoft Windows operating system or Samba, a CIFS/SMB server for Unix ; On the left side table select Misc Microsoft Windows SMB Guest Account Local User Access: Medium: Commonly included as a basic system service on Unix-based operating systems Description Perhaps one of those will point to a solution like @Steve Gillham (Customer) recommended BugTraq serves as the cornerstone of the Internet-wide security community Clients use LM and NTLM authentication, and use NTLMv2 session security if the server supports it Samba has provided secure, " The server message block (SMB) protocol provides the basis for many network operations Click on ‘Microsoft network server: Digitally sign communications (always) NVT: Microsoft Windows SMB/NETBIOS NULL Session Authentication Bypass Vulnerability (OID: 1 This way the hackers get an idea of which user ID to crack HKLM\SYSTEM\CurrentControlSet\Services\lanmanserver\parameters\restrictnullsessaccess=1 5 Microsoft Windows Kernel Win32k Introduction The server message block (SMB) protocol is a file sharing protocol over the network, where with intended to extend the capability from access file locally, able to share across the network Null sessions are remotely exploitable; this means that attackers can use their computers to attack a vulnerable Windows machine 1) Open regedit WannaCry ransomware is propagated using the SMB EternalBlue and DoublePulsar attack methodology (CC-1353) which exploits the SMB vulnerabilities patched in Microsoft Security Bulletin MS17-010 An authenticated, remote attacker can exploit this, via an application that sends specially crafted traffic to a domain controller, to run processes in an elevated context List of CVEs: CVE-2008-4114 Nessus Plugin 56211 0) 45517: MS10-024: Vulnerabilities in Microsoft Exchange and Windows SMTP Service Could Allow Denial of Service (981832) (uncredentialed check) Medium (5 In the “Data Entry” 1 | P a g e This work is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 4 Right click and Configure Options 14 In your Lab Report file, define the terms vulnerability and exposure A "vulnerability" is a weakness in the computational logic (e 2 //-U will get userlist SMB null session is an unauthenticated netbios session between two computers Microsoft Windows 2000 a; Microsoft Windows NT; Featured Stories On February’s Patch Tuesday (2/11/2015), Microsoft released two patches that fix issues with the way Group Policy is processed by the client Countermeasure Enable the Network access: Restrict anonymous access to Named Pipes and Shares setting Adding it to the original post A common misconfiguration of SMB is null session authentication , which can allow any user to authenticate to an SMB share by providing a null username and password [Original] As I’ve been working through PWK/OSCP for the last month, one thing I’ve noticed is that enumeration of SMB is Microsoft Windows SMB svcctl MSRPC Interface SCM Service Enumeration: Medium (5 POC #2: Pre-Auth RCE Combining SMBleed with There are two primary vectors for compromising Windows systems remotely: Proprietary Windows networking protocols These include the classic Windows protocols Server Message Block (SMB), Microsoft Remote Procedure Call (MSRPC), and the NetBIOS protocols, including the NetBIOS Session Service and the NetBIOS Names Service (NBNS) py –host-file smb-hosts See also : The SMB Server service in Microsoft Windows XP SP2 and SP3, Windows Server 2003 SP2, Windows Vista SP1 and SP2, Windows Server 2008 Gold, SP2, R2, and R2 SP1, and Windows 7 Gold and SP1 does not properly validate fields in SMB requests, which allows remote attackers to execute arbitrary code via a malformed request in a (1) SMBv1 or (2) SMBv2 Case studies expose the hackers latest devious methods and illustrate field-tested remedies 2 Session Depending on the configuration, it may be possible for an unauthenticated, remote attacker to leverage this issue to get information about the remote The vulnerability scanner Nessus provides a plugin with the ID 26920 (Microsoft Windows SMB NULL Session Authentication), which helps to determine the existence of the flaw in a target environment SMB over QUIC offers an “SMB VPN” for telecommuters, mobile device users, and high security organizations 36 - PHP Multiple Vulnerabilities - 04 - Jul16 (Linux) 1010317* - Microsoft Windows SMB Remote Code Execution Vulnerability (CVE-2020-1301) 1005448* - SMB Null Session Detected - 1 DCERPC Services - Client 1010106* - Identify Downloading Of PowerShell Scripts Through SMB Share (ATT&CK T1086) DNS Client 1003328* - Disallow Intra-Site Automatic Tunnel Addressing Protocol Nmap serves various scripts to identify a state of vulnerability for specific services, similarly, it has the inbuilt script for SMB to identify its vulnerable state for given target IP 168 More details have emerged about a security feature bypass vulnerability in Windows NT LAN Manager that was addressed by Microsoft as part of its monthly Patch Tuesday updates earlier this month For the uninitiated, Windows exposes Vulnerability microsoft-ds (445/tcp) It was possible to log into the remote host using a NULL session SMB is a file, printer, and serial port sharing protocol for Windows machines on the same network or domain HKLM\SYSTEM\CurrentControlSet\Services Vulnerability Description: SMB stands for "Server Message Block" and is also known as CIFS (Common Internet File System) This can greatly enhance The remote host is running Microsoft Windows Windows NT days, so they could not make use of standard user authentication schemes like NTLM or Kerberos To create a null session, try this: C:\>net use \\PC01\ipc$ "" /user:"" The command completed successfully Step 2 – Using Qualys: 1) Create Windows authentication records This is where the SMB Login Check Scanner can be very useful, as it will connect to a range of hosts and determine if the username/password combination can access the target Step - The step number in the procedure Go to “Network Services” > ”Win/Mac/NFS” Affected Products Here is how to run the Security Updates for Microsoft A null session attack exploits an authentication vulnerability for Windows Administrative Shares; this lets an attacker connect to a local or remote share without authentication These sessions help to supply the foundation of the network file and the print sharing Vulnerability scanning with Nessus RESOLUTION The Exploit Database is maintained by Offensive Security, an information security training company that provides various Information Security Certifications as well as high end penetration testing services Microsoft Windows Server Service Crafted RPC Request Handling Remote Code Execution-Arbitrary code can be executed on the remote host due to a flaw in the 'Server' service Unless null sessions are disab led via a registry change or File and Printer Winbind and Security Also known as anonymous or guest access Find out how to block infrastructure hacks, minimize User Account Control: Run all administrators in Admin Approval Mode – Enable Launch QTS and go to the “Control Panel” On Tuesday, October 13, as part of the October 2020 Patch Tuesday release, Microsoft published a security advisory for CVE-2020-16952, a server-side include (SSI) vulnerability in Microsoft SharePoint Sure, it’s ugly and bewilderingly complex SMB enumeration: This is what you might come across pretty often Search Results 34:445 windows xp sp 2 or windows xp sp 3 35362 Critical MS09-001: Microsoft Windows SMB Vulnerabilities Remote ≈server:445 192 This category consists of QIDs that detect vulnerabilities or gather information about SNMP-based applications msc to open Local Group Policy Server Message Block (SMB) is a high-level command and data protocol used extensively in the Microsoft world for interprocess communication and file and print sharing In this example the ipc$ share is a common default share, often is use 1005448 - SMB Null Session Detected - 1 A workaround is to, - Disable null session login Exposure to null sessions can be tested by issuing the following from a command line: net use \\remote_IP_address\ipc$ ”” /u:”” The protocol gives away too much information and offers too much trust to client machines Tor Microsoft Windows SMB Shares Unprivileged Access Domain controllers accept LM, NTLM, and NTLMv2 authentication It was possible to log into it using a NULL session 86004 Enterprise Server "PageServices" File Disclosure Vulnerability CVE-2020-1301 AFFECTED SOFTWARE AND VERSION Returns information about the SMB security level determined by SMB DNS Amplification Another share, Admin$, allows one to access the Windows installation directory Channel Binding Tokens (CBT) signing events 3039, 3040, and Restart the system VNC Server Authentication-less Samba / SMB – port 445 / 139 Upgrade your operating system to more advanced and secure Windows 10 or Windows Server 2012 11 4 It starts by performing an NMap scan and then the processed results are used to launch exploit and enumeration modules according to the your configuration MS-17-010, otherwise known as ETERNALBLUE, is a unauthenticated remote code execution vulnerability in Windows SMB most famous for it’s leak by the Shadow Brokers and for driving the WannaCry worm in May 2017 Here is how to interpret the output: User-level authentication: Each user has a separate username/password that is used to log into the system Check (√) - This is for administrators to check off when she/he completes this portion Microsoft Windows SMB/NETBIOS NULL Session Authentication Bypass Vulnerability Summary The host is running SMB/NETBIOS and prone to authentication bypass Vulnerability Solution No solution or patch was made available for at least one year since disclosure of this vulnerability Disable Broadcast Traffic - Enable passwords on the share nessus --style long --match 'ms[\d]+' ID severity pluginName hostname IP Operative-System 35362 Critical MS09-001: Microsoft Windows SMB Vulnerabilities Remote ≈admin:445 192 Network security: Allow LocalSystem NULL session fallback Login with the Administrator user using Windows Authentication Nessus Plugin While Port 139 is known technically as ‘NBT over IP’, Port 445 is ‘SMB over IP’ 12" dialect, There are 2 possible packet format for SMB_COM_SESSION_SETUP_ANDX command Disable SMB NULL on Windows 2012 We reconfigured the smbclient command to access the share and we see that we find a file named raj Upgrading to version 98, XP or Server 2003 eliminates this vulnerability (NULL sessions) Nessus Plugin 26920 py examples/* 92 SMB Null-Session Last Monday we got our PCI penetration test back from our PCI auditor The link to the license terms can be found This will open the Group Policy Editor, navigate thorough the following "Computer Configuration\Windows Settings\Security Settings\Local Policies\Security Options\" The wording is a little strange, and I’m still not too sure why the term “SMB VPN” is used, but Click to start a New Scan Download The Complete Hardened Services Guide The solution implemented adds integrity Here is how to run the Security Updates for Microsoft Googling for "Windows XP SMB exploit" takes us to the Rapid7 site and documentation for a Metasploit module On most modern networks NetBIOS can be disabled in Open Control Panel, click Programs, and then click Turn Windows features on or off If you want to read more about EternalBlue, you can check out a Wikipedia page about it here SMB allows systems to share access to files, printers, and other resources on the network Module type: exploit Rank: good Platforms: Windows This module exploits a stack buffer overflow in the RPC interface to the Microsoft Message Queueing service Authentication ID: 31271: Created: Mar 02, 2012: Updated: Mar 02, 2012: Severity: They have exploited a vulnerability for SMB NULL share on a domain controller A NETBIOS/SMB share password is the default, null, or missing The server certificate creates a TLS 1 A Microsoft Server service vulnerability in which a crafted RPC request triggers an overflow during path canonicalization, also known as relative path stack corruption SNMP Not shown: 997 closed ports PORT STATE SERVICE VERSION 135/tcp open msrpc Microsoft Windows RPC 139/tcp open netbios-ssn Microsoft Windows netbios-ssn 445/tcp open microsoft-ds Microsoft Windows XP microsoft-ds Service Info: OSs: Windows, Windows XP; CPE: cpe:/o:microsoft:windows, cpe:/o:microsoft:windows_xp Nmap scan report for 10 4) Verify that authentication passed for each target host NULL セッションを使用して(つまり、ログインやパスワードなしで)、ログインできます。 Taking action to disable null sessions can be an important step in hardening the overall security Through the Dialect column, you can quickly identify any SMB 1 SMB usually rides on top of Network Basic Input/Output System (NetBIOS), a network communication protocol developed by IBM in the early 1980s Tip - Run the Authentication Report to view the authentication status (Passed or Failed) 40 smbclient //192 801991) Overview: The host is running SMB/NETBIOS and prone to authentication bypass Vulnerability Vulnerability Insight: The flaw is caused due to an SMB share, allows full access to Guest users The Microsoft Security Bulletin MS08-067 essentially explains that remote code can be executed on an unpatched Windows systems (Windows Server 2000, Windows Server 2003, and Windows XP) using a specially fashioned RPC request 96 You'll see such anonymous logons also referred to as null sessions 04 Jan Working with Active and Passive Exploits in Metasploit Pentester Metasploit,Skills; Tags: active exploits, ani_loadimage_chunksize, passive exploits, psexec no comments All exploits in the Metasploit Framework will fall into two categories: active and passive Here are the Windows 2008 registry changes This forces Windows to authenticate using the username, domain, and password of the logged-in user For Remote Only search, the QIDs/vulnerabilities detected by a Remote Scan will get listed Disable Local System NULL session fallback none *3: Samba Badlock Vulnerability: Medium: CVE-2016-2118: General: none *5: Null Session/Password NetBIOS Access: Medium: CVE-1999-0519 Server Message Block (SMB) Protocol is a network file sharing protocol, and as implemented in Microsoft Windows EternalBlue, also known as MS17-010, is a vulnerability in Microsoft's Server Message Block (SMB) protocol conf A downgrade to samba-4 Combined with SMBGhost, which was patched three months ago, SMBleed allows to achieve pre-auth Remote Code Execution (RCE) FIREWALL UDP MICROSOFT WINDOWS PACKET SOURCE PORT 53 RULESET BYPASS Bypass of firewall rules by sending UDP packets with a source port equal to 53 E 8 Host Source of a vulnerability-Organized into families The C$ share will allow one to access the C Drive on the remote machine It is the reason we are about to cover all things related to SMB Enumeration and go in-depth with Nmap SMB Scripts also Hello, TLDR; I think I found three new ways to do user enumeration on Windows domain controllers, and I wrote some scripts for it HP System Management Homepage Cross-site Request Forgery 129 ” as shown below Severity CVSS Version 3 Do not allow any shares to be accessed anonymously Concluding Microsoft Windows SMB Direct Session Takeover In order to use the WikiLeaks public submission system as detailed above you can download the Tor Browser Bundle, which is a Firefox-like browser available for Windows, Mac OS X and The CVA is a fundamental cyber security certification Cybersecurity Training Course that focuses on vulnerability assessments This command will display necessary National Vulnerability Database National Vulnerability Database NVD This option can also be appended to your local share definitions SMB The result section for this QID is blank To see all the options of this tool, just type “ enum4linux -h “ 94 Configure authentication on the target to restrict access to Description: Allows outbound SMB TCP 445 traffic to only DCs and file servers when on a trusted network First nmap is used to check for the vulnerability and then the Metasploit ms08-067_netapi module is used to exploit the Login to the Qualys Portal > Go to KnowledgeBase > click Search and select Remote Only or Authenticated Only from the Discovery Method list Web Application Vulnerabilities & Disable the sending of unencrypted passwords to third-party Server Message Block (SMB) servers Conclusion This initial exploit is known as the null session , anonymous logon or Red Button exploit (named after an early application that scanned for the null session vulnerability) The syntax is simple: Command: $ 0 plugin family Current CIFS implementation under Windows runs over port tcp/139 and/or 1; and Windows 10 Gold, 1511, and 1607; and Windows Server 2016 allows remote attackers to execute arbitrary code via crafted packets, aka "Windows SMB Remote Code Execution You will find it wherever Windows computers are sharing printers, files, and sometimes remote control This is a typically boring lab • Provides communications abstractions: named pipes, mail slots • Remote Procedure Calls (DCE/RPC Nbtstat is a Windows command that can displays information about a target Descripción: El host remoto ejecuta Microsoft Windows Next - Vulnerabilities / Misconfigurations Browse to this Path : Computer Configuration\Windows Settings\Security Settings\Local Policies\Security Options The concept of a NULL session is to provide a null username and a null password, which grants the user the 'guest' access All the smb tests will be done as ''/'' in domain ADAM Domain controllers accept LM, NTLM, and NTLMv2 authentication Select Advanced tab and change “Vendor class” to “Microsoft Windows 2000 Options” Almost 19 months ago, the security researcher Will Dormann with the CERT Coordination Center (CERT/CC) discovered a severe vulnerability in Microsoft OS-WINDOWS Microsoft Windows SMB NTLM NULL session attempt WINS spoofing via NetBIOS On most modern networks NetBIOS can be disabled in Exploiting Null Sessions with Windows Set up the LAN Manager to refuse LM and NTLMv1 authentication NET core (March 2022) as a standalone plugin via the Nessus web user interface (https://localhost:8834/): SMB is a client-server interaction protocol where clients request a file, and the server provides it to the client Vulnerabilities: Since SMB and NetBios/NetBT services are enabled by default, malicious intruders may be able to query these services to gather Replace “New Value #1” with “LMCompatibilityLevel” The tag ‘impact’ of plugin “Microsoft Windows SMB/NETBIOS NULL Session Authentication Bypass Vulnerability” says that: “Successful exploitation could allow attackers to use shares to cause the system to crash This vulnerability only applies to Windows, and this system is Linux, so Windows login does not apply Any value above 50 only caches 50 logon attempts ขั้นตอน (Steps) ผล Scan ช่องโหว่ จาก Nessus เป็นดังรูป (ทดสอบบน Windows server 2003) – Microsoft Windows SMB NULL Session Authentication 32 - PHP Multiple Double Free Vulnerabilities - Jan15 2 If you want higher authentication to do what you need, you look for a privilege escalation The Vulnerabilities in Microsoft Windows SMB LsaQueryInformationPolicy Function SID Enumeration Without Credentials is prone to false positive reports by most vulnerability assessment solutions x SMB protocol commonly known as Server Message Block protocol has been a hot target among threat actors for many years because of its complexity and open nature On Windows 2008 Server is was easy microsoft Large MTU: If have Gigabit Internet, SMB 3 The local users can be logged on either physically on the machine, or through a terminal services session txt 101 There are a common set The SMB Server service in Microsoft Windows XP SP2 and SP3, Windows Server 2003 SP2, Windows Vista SP1 and SP2, Windows Server 2008 Gold, SP2, R2, and R2 SP1, and Windows 7 Gold and SP1 does not properly validate fields in SMB requests, which allows remote attackers to execute arbitrary code via a malformed request in a (1) SMBv1 or (2) SMBv2 If the remote host is running Microsoft Windows, Learn more For example, the connection is established via anonymous login (no password #enum4linux -a <IP> //performs all basic enumeration using smb null session 0 for NULL session # UnicodePasswordLen field is 1010417* - SAP NetWeaver AS JAVA Authentication Bypass Vulnerability (CVE-2020-6287) Server Message Block Vulnerabilities Null sessions have no special rights Figure 1: Modifying the RestrictAnonymous key in the registry Disable smbv1 via PowerShell There are a wide variety of exploits for smbv1 View Analysis Description This is frequently done between machines that exchange RPC through named pipes These versions contain an interprocess communication share (IPC$) that allows a null session We connect to the SMB as user raj and find a share by the name of ‘share’ This vulnerability is also known as EternalBlue which was developed by the NSA The flaw, tracked as CVE-2021-1678 (CVSS score 4 Alternatively, the attacker could pose as the server or client after legitimate authentication and gain unauthorized access to data 299 Despite Microsoft's claim that this vulnerability can be exploited without authentication, the NDDEAPI pipe is only accessible after successful authentication ”, and the tag For Domain Controllers running Windows Server 2016, run the following three lines in an elevated Windows PowerShell session to disable SMB null sessions: New-ItemProperty -Path "HKLM:\System\CurrentControlSet\Control\Lsa" -Name RestrictAnonymous -Value 1 -PropertyType DWORD -Force Samba/NetBIOS issue CVE-2019-1443 SYS driver of the Windows operating system For these sessions, the ClientUserName column would be empty A NULL session (no login/password) allows to get information about the remote host Adversaries may use SMB to interact with file shares, allowing them to move laterally throughout a network If there is a UT Note for this step, the note number corresponds to the step number running Microsoft Windows, where it was known as “Microsoft Windows Network” before the Microsoft acknowledged the vulnerability and has published an advisory and a patch, resolving this issue Microsoft Windows SMB Login Possible This vulnerability has alerted 23,000 times in the last six months and is number six on the list For more information see [nvd] You made a couple registry changes and everything was good Some vulnerability categories are platform-specific (for example Debian and SUSE) while others are more general (for example Database and Firewall) Enforce SMB Signing dos exploit for Windows platform conf: 'server signing = auto' and ' client signing = enabled' OpenSSL Running Version Prior to 0 Then, you can sort, etc This post explain the steps for disabling SMB/NETBIOS NULL Session on domain controllers using group policy 90003 Microsoft Windows Media Services Severed Connection DoS Action: Allow the connection if it is secure The vulnerability was discovered by Ron Bowes while working on smb-enum-sessions and was They can perform session hijacking, posing as the server or client device using a legitimate authentication session and gain unauthorized access to data Vulnerability Null sessions are a weakness that can be exploited through shared folders (including the default shared folders) on devices in your environment Understanding the Windows SMB NTLM Authentication Weak Nonce Vulnerability BlackHat USA 2010 What is SMB NTLM Authentication? ‣ SMB (Server Message Block) • Microsoft Windows Protocol used for network file sharing, printer sharing, etc Vulnerabilities; CVE-1999-0519 Detail Current Description A remote code execution vulnerability exists in the way that the Microsoft Server Message Block 1 e You could disable them, but at the cost of possible disruption of certain network services (for example, Windows NT's passthrough authentication used in establishing trusted access between domains) This key is used for cryptographic operations on a session It is now a Windows-based network that gives users to create, modify and delete the shared files, folders, printers within the network The exploits in Metasploit for MS17-010 are much more stable than the Python script counterparts exe to crash Allow Local System to use computer identity for NTLMv2 authentication Countermeasure A null session implies that access to a network resource, most commonly the IPC$ “Windows Named Pipe” share, was granted without authentication This protocol is intended to provide an open cross-platform mechanism for client systems to request file services from server system over a network 0/CIFS File Sharing Support checkbox, and then click OK to close the window 0 in QTS 4 # For "NT LM 0 Tor is an encrypted anonymising network that makes it harder to intercept internet communications, or see where communications are coming from or going to Vulnerabilidades Step 1 : Apply below group policy settings to Default Domain Controller policy object or to the GPO object that is applied to your domain controllers A null session occurs when you log in to a system with no username or password The server message block (SMB) protocol provides the basis for many network operations /smbmap Back then I wrote: Microsoft released a fix as part of the Update Tuesday in May 2020 ; Select Advanced Scan ; On the top right corner click to Disable All plugins The scanner does not require authentication credentials to detect these vulnerabilities Click on LSA 3) If you don’t see LMCompatibilityLevel in the right window pane, then choose: Edit > New > REG_DWORD To disable these bindings, bring up the Control Panel, double-click on Network, and then click on the Bindings tab Authentication: NONE: Ease of Access: Affected Systems MS15-011 & MS15-014: Microsoft Active Directory Group Policy (GPO) Vulnerabilities Patched ; Navigate to the Plugins tab accounts or shared resources on this host Expand the "Security" and "Logins" folders SMB NULL session Synopsis : It is possible to log into the remote host SMB uses TCP 139 and TCP 445 ports by default 0 sessions: The value in the column would start with 1 Windows has not allowed null or anonymous Description vulnerability is a To prevent Introduction to NULL sessions NULL sessions have already been discussed in the past Still, interesting and new things to discuss NULL sessions are used to anonymously call RPC operations on a remote system NULL sessions are unauthenticated SMB sessions SMB is Windows core network protocol, not to be confused with NetBIOS! SMB operates over The SMB Server service in Microsoft Windows XP SP2 and SP3, Windows Server 2003 SP2, Windows Vista SP1 and SP2, Windows Server 2008 Gold, SP2, R2, and R2 SP1, and Windows 7 Gold and SP1 does not properly validate fields in SMB requests, which allows remote attackers to execute arbitrary code via a malformed request in a (1) SMBv1 or (2) SMBv2 Also not too meaningful because Nessus is banned on OSCP, unsurprisingly because it enumerates vulnerabilities really well although, unlike the nmap script engine, does to exploit this The vulnerability is allowed to occur because earlier versions of SMB contain a flaw that lets an attacker establish a null session connection via last Thousands of organizations used that list to prioritize their efforts so they could close the most dangerous holes first The bug is exploitable by an authenticated user with page creation privileges, which is a standard permission in SharePoint, and allows the 34 - PHP Remote Code Execution and Denial of Service Vulnerabilities - Dec13 2 e 2000,xp,2003 Vulnerabilities in NULL Session Available (SMB) is a Low risk vulnerability that is also high frequency and high visibility The mission of the CVE Program is to identify, define, and catalog A new look at null sessions and user enumeration Apparently the rpcclient version in OffSec VM does not work well with creating null sessions 0) 26920 Microsoft Windows SMB NULL Session Authentication Medium (5 Virtual Appliance can be installed on entry level Win [] Posted in Daily_Tips, Tech Stuff, Write-ups Tagged 0 exploit, 2017 owasp top 10, 2nd order sql injection, 3389 exploit, 3389 port exploit, 5 penetration, a xss, a zero day vulnerability, about sql injection, abyss web server Microsoft Windows - LSASS SMB NTLM Exchange Null-Pointer Dereference (MS16-137) Enable Microsoft Networking and click “Advanced Options” As we can see above, this system is part of a workgroup This module has been tested successfully against Windows Vista Customize Allow if Secure Settings: pick one of the options, set Override block rules = NetBIOS over TCP/IP (NBT) is installed and enabled by default for backwards compatibility with old systems (or SMB implementations); however Microsoft SMB Protocol can be used without Microsoft NetBIOS How to fix Microsoft Windows SMB Vulnerabilities Remote Code Execution (MS09-001) – Windows 2003; How to fix Microsoft Windows SMB NULL Session Authentication – Windows 2003; Web application 1 You should be able to read these details within the Analysis tab, under vulnerabilities and select vulnerability detailed list in the tool dropdown This check will crash the service if it is vulnerable and requires a guest account or higher to work sys PATHRECORD chain Multiple Vulnerabilities That will log an anonymous logon No login ID or password requred TLDR; I think I found three new ways to do user enumeration on Windows domain controllers, and I wrote some scripts for it Null sessions can not enumerate user names HKLM\System\CurrentControlSet\Control\Lsa\EveryoneIncludesAnonymous 0 – Default setting Copied! Port 445 NetBIOS null sessions are a vulnerability found in the Common Internet File System (CIFS) or SMB, depending on the operating system Likely none will be provided anymore The solution from this MSFT link is also posted in solution section of QID 45003 In this policy setting, a value of 0 disables logon caching 1; and Windows 10 Gold, 1511, and 1607; and Windows Server 2016 SecPoint comes as Virtual as well as hardware appliance Keep in mind that this is very “loud” as it will show up as a failed login attempt in the event logs of every Windows box it touches Moreover, this attack can be used to 168 Microsoft Windows NetBIOS Shares Access Control Weakness Windows *2 = False positive For a vulnerability scan be sure to select “Windows” in the Authentication section Last modified 1mo ago Adding 'restrict anonymous = 2' in smb Windows: NASL id: SMB_NULL_SESSION This includes vulnerabilities, potential vulnerabilities and information gathered checks NASL: description: The remote host is running Microsoft Windows 97 com) and is available as an RPC interface Depending on the configuration, it may be possible for an unauthenticated, remote attacker to leverage this issue to Step 1 : Apply below group policy settings to Default Domain Controller policy object or to the GPO object that is All is not lost however, since Windows XP has a very famous and reliable SMB vulnerability called MS08-067 While looking at the vulnerable function of SMBGhost, we discovered another vulnerability: SMBleed (CVE-2020-1206) Three common shares on Windows machines are the C$, Admin$, and IPC$ REM reg query HKLM \SOFTWARE\Policies\Microsoft\Windows\Installer /v AlwaysInstallElevated | Find "0x1" 1 > Could you check which security option is given in your smb A Windows null session Microsoft Windows SMB/NETBIOS NULL Session Authentication Bypass Vulnerability The host is running SMB/NETBIOS and prone to an authentication bypass vulnerability Insight The flaw is due to an SMB share, allows full access to Guest users a null password, which grants the user the 'guest' access That interface is available through the \pipe\efsrpc, \pipe\lsarpc, \pipe\samr, \pipe\lsass and HACKING WINDOWS - ENDPOINT AND SERVER HACKING - Bolster your systems security and defeat the tools and tactics of cyber-criminals with expert advice and defense strategies from the world-renowned Hacking Exposed team conf can help resolve the issue 139/tcp open netbios-ssn Microsoft Windows netbios-ssn Right click "sa" and select "Properties" Indexsinas is an SMB worm malware that affects the Server Message Block protocol in Microsoft Windows operating In order to configure the "Restrict Anonymous" setting: ·Open Regedt32 Remove Outdated Windows Null Session; Tags: null session, rpcclient, smb; no comments Rpcclient is Your Friend! By Ed Skoudis I absolutely adore the Server Message Block (SMB) protocol 6 50 3 Explanation of One Vulnerability The selected vulnerability to be exploited is the Microsoft Windows SMB NULL Session Authentication 0) 57608 SMB Signing Required Info 10114 ICMP Timestamp Request Remote Date Disclosure Info 10150 Windows NetBIOS / SMB Remote Host Information Disclosure Info 10287 Traceroute Information Info 10394 4) Close the “Group Policy” window SMBleed allows to leak kernel memory remotely Potential impact 1 – Default setting nse script checks if a Microsoft Windows 2000 system is vulnerable to a crash in regsvc caused by a null pointer dereference Boring because it just involves scanning and minimal exploitation, with a commercial product This is a nice way to shoot for low hanging misconfigurations across multiple hosts Microsoft Distributed Transaction Coordinator (MSDTC) for Windows NT 4 However, an attacker cannot reach the vulnerable code using the null session share so the attacker must be authenticated to exploit this vulnerability As result, it has shown the target machine is highly vulnerable to Ms17-010 (eternal blue) due to SMBv1 MS As the name suggests, it is a tool used for enumeration of Linux Description The remote host is running a Microsoft Windows operating system or Samba, a CIFS/SMB server for Unix Over the years, I have often used the NULL session vulnerability to enumerate lists of users, groups, shares and other interesting information from remote Windows systems Default number: 10 95 This is an active check for a protocol-specific vulnerability, not an operating system vulnerability The fact that all users in the domain can see the UNIX/Linux server in their Network Neighborhood and can browse the shares on the server seems to excite them further Es posible iniciar sesión con una sesión NULL (es decir, sin inicio de sesión ni contraseña) - The type of plugin feed (HomeFeed or ProfessionalFeed) - The version of the Nessus Engine The CVA is a fundamental cyber security certification course that focuses on vulnerability assessments Command arguments: –host-file: file containing a list of hosts, one host/IP per line PHP Running Version Prior to 5 So, once you disallow null sessions, both these QIDs will not get flagged SMB null session enumeration: enum4linux -a 10 SMB null session is available for SMB1 systems only i 25623 Windows has not allowed null or anonymous access for a very long time Nmap's connection will also show up, and is This document was generated from data supplied by the national vulnerability database, a product of the national institute of standards and technology 0, 2000 SP4, XP SP1 and SP2, and Server 2003 allows remote attackers to cause a denial of service (crash) via a BuildContextW request with a large (1) UuidString or (2) GuidIn of a certain length, which causes an out-of-range memory access, aka As the LM hash is designed for authentication of legacy Microsoft Windows operating systems, such as those prior to Microsoft Windows 2000, there shouldn’t be a business requirement for its use except in very rare circumstances none Description system, which could lead to a loss of network functionality 3) Launch a scan Beyond the enumeration I show here, it will also help enumerate shares that are readable, and can ever execute commands on writable shares exe (Start > run > type 'regedt32' and click OK) ·Locate the following key: HKEY_LOCAL_MACHINE\System\CurrentControlSet\Control\LSA ·Double Click the DWORD Value Name: 'RestrictAnonymous' ·Enter the appropriate setting according to your environment This plugin connects to \srvsvc (instead of \svcctl) to enumerate the list of services running on the remote host on top of a NULL session Server Message Block (SMB), aka Common Internet File System (CIFS), is the network-protocol that enables file exchanges between Microsoft Windows computers Microsoft Windows SMB Shares Unprivileged Access: To restrict access under Windows, open Explorer, do a right click on each share, go to the 'sharing' tab, and click on 'permissions' A little bit over a year ago, I wrote an article on this blog about CVE-2020-1113 and how it enabled code execution on a remote machine through relaying NTLM authentication over RPC triggering a scheduled task on the remote system In the Windows Features window, clear the SMB1 set "security" to "user" or "domain" or "server" as per your requirements Name: Allow outbound Domain/Private SMB 445 The concept of a NULL session is to provide a null username and Server Message Block (SMB) is built into Windows computers and can be used to transfer files from one host to another Microsoft Windows SMB Relay Code Execution Security weaknesses are increased with SMB and CIFS because it includes NULL session, WINS, and network chatter The server exe 2) Navigate to HKLM\System\CurrentControlSet\control\LSA 0 will use Large MTU Resolving “Windows NetBIOS / SMB Remote Host Information Disclosure” (2019) Vulnerability scans and penetration tests will often produce a substantial number of issues such as “Windows NetBIOS / SMB Remote Host Information Disclosure” SMB Commands Ethical Hacking CHAPTER 8 – WINDOWS VULNERABILITIES ERIC VANDERBURG It is assigned to the family Windows and running in the context remote 15 minutes 3), was described as a "remotely exploitable" bug found in a vulnerable component bound to the network stack, SMB relay attack Exploiting the weak Windows authentication protocols is on the top of the list for any adversary, because it mostly relies on a design This is the default setup of pretty much everything these days Today, Microsoft released bulletin MS08-068, which addresses a well-known flaw in the SMB authentication protocol 1010317* - Microsoft Windows SMB Remote Code Execution Vulnerability (CVE-2020-1301) 1005448* - SMB Null Session Detected - 1 DCERPCサービス - クライアント Enable SMB 3 - Whether credentialed or third-party patch management nmap --script smb-vuln* -p 445 192 Active Exploits This script displays, for each tested host, information about the Now we enumerate the user-specific share It can even import the results of a previous Microsoft has also released emergency patches for Windows operating systems that are no longer supported, including Windows XP, 2003, and 8 Interestingly enough, one of these vulnerabilities (MS15-014) makes the other one (MS15-011) not only feasible 0 International Public License New-ItemProperty -Path Microsoft Windows SMB NULL Session Authentication This is a feature of the Windows NT/2000/XP operating systems Once an attacker has made a NetBIOS connection using a null A Netlogon session is initiated by the client, whereby client and server exchange random 8-byte nonces (called client and server challenges) with each other It is important to enable SMB signing as attackers can potentially intercept the traffic after gaining unauthorized access to the network and modify unsigned Server Message Block (SMB) packets SMB lets you share files, disks 9 *1 = False positive "; tag_impact = "Successful exploitation could allow How to verify the Redis server unprotected by password authentication; Find out Articles 3 Edit GPO- Go to Computer configuration\Policies\Windows settings\Security Settings Microsoft Windows SMB NULL Session Authentication The idea is simple – use no username, no password, and get a session anyways In the same way enable the policy Network Security: Restrict NTLM: Audit Incoming NTLM Traffic Windows provides a very simple interface for sharing folders and printers via NetBIOS shares, but the permissions are frequently very open, sometimes granting full access to everyone Vulnerability: Each SMB session consumes server resources, and numerous null sessions will slow the server or possibly cause it to fail This is an inherent byproduct of having workstations with NetBIOS enabled General solution options are to upgrade to a newer release, disable respective features, remove the product or replace the product by another one Set the “Highest SMB version” to “SMB 3 If the connecting user is an administrator and network logins are allowed to the target machine, this module will execute an arbitrary payload Copy link SSH Weak Algorithms Supported: Medium Misc In the Computer Configuration -> Windows Settings -> Security Settings -> Local Policies -> Security Options section, find and enable the Network Security: Restrict NTLM: Audit NTLM authentication in this domain policy and set its value to Enable all How to Counteract Null Session Attacks Exploiting the vulnerability reportedly requires admin access or chaining with another vuln (likely CVE-2021-26855), but successful exploitation results in RCE as the MS08-063 is remote code execution vulnerability reachable over SMB Microsoft Windows SMB NULL Session Authentication smbclient -L <ip_address> smbclient -L 192 Samba is a re-implementation of the SMB networking protocol that provides file and print services for various Microsoft Windows clients Winbind and Security