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Home - Vulnerability NotesPrint
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CERT-In Vulnerability Note CIVN-2009-0120
Multiple Vulnerabilities in Microsoft SMBv2 could allow Remote Code Execution

Original Issue Date:October 15, 2009

Severity Rating: HIGH

Systems Affected

  • Microsoft Windows Vista, Windows Vista Service Pack 1
  • Microsoft Windows Vista Service Pack 2
  • Microsoft Windows Vista x64 Edition
  • Microsoft Windows Vista x64 Edition Service Pack 1
  • Microsoft Windows Vista x64 Edition Service Pack 2
  • Microsoft Windows Server 2008 for 32-bit Systems
  • Microsoft Windows Server 2008 for 32-bit Systems Service Pack 2
  • Microsoft Windows Server 2008 for x64-based Systems
  • Microsoft Windows Server 2008 for x64-based Systems Service Pack 2
  • Microsoft Windows Server 2008 for Itanium-based Systems
  • Microsoft Windows Server 2008 for Itanium-based Systems Service Pack 2

Overview

Multiple vulnerabilities have been reported in Microsoft Server Message Block Version 2 SMBv2 which could allow remote attacker to execute arbitrary code and could cause Denial of Service condition.

Description

1. SMBv2 Infinite Loop Vulnerability ( CVE-2009-2526   )

A denial of service vulnerability exists in Microsoft SMBv2. This vulnerability is caused due to the improper validation of fields inside SMBv2 packets. A remote attacker could exploit this vulnerability by sending specially crafted malformed SMB version 2 SMBv2 packets to the target system running Server Services. Remote attacker could attempt to exploit this vulnerability without any authentication. Successful exploitation of this vulnerability could allow remote attacker to cause the target machine to stop responding until restarted.

2.  SMBv2 Command Value Vulnerability ( CVE-2009-2532   )

An unauthenticated remote code execution vulnerability exists in Microsoft SMB which is caused due to improper use of unvalidated data while processing SMB Multi-Protocol Negotiate Request packets. An unauthenticated, remote attacker could exploit this vulnerability by sending specially crafted SMBv2 packets to the target system running Server Services. Successful exploitation of this vulnerability could allow remote attacker to execute arbitrary code on the target system with elevated privileges.

3. SMBv2 Negotiation Vulnerability ( CVE-2009-3103civn-2009-114   )

An unauthenticated remote code execution vulnerability exists in Microsoft SMB. This vulnerability is caused because _Smb2ValidateProviderCallback function in the Windows SMB2 srv2.sys component fails to properly check the size of headers in SMB2 messages before using that input in memory operations. An unauthenticated, remote attacker could exploit this vulnerability by sending malicious request to target system running Server Services. An invalid pointer dereference condition could cause while processing malformed inputs, could allow remote attacker to manipulate memory pointers which could leads to memory corruption. Successful exploitation of this vulnerability could allow remote attacker to execute arbitrary code on the target system with elevated privileges.

Workaround

  • Disable SMB v2
  • Block TCP ports 139 and 445 at the firewall

    • Solution

    Apply appropriate patches as mentioned in Microsoft Security Bulletin MS09-050

    Vendor Information

    Microsoft
    http://www.microsoft.com/technet/security/bulletin/ms09-050.mspx
    http://www.microsoft.com/technet/security/bulletin/MS09-001.mspx

    References

    VUPEN
    http://www.vupen.com/english/advisories/2009/2886

    CISCO
    http://tools.cisco.com/security/center/viewAlert.x?alertId=19173
    http://tools.cisco.com/security/center/viewAlert.x?alertId=19176
    http://tools.cisco.com/security/center/viewAlert.x?alertId=19000

    SecurityTracker
    http://www.securitytracker.com/alerts/2009/Oct/1023004.html

    CERT-In
    CIVN-2009-0114

    CVE Name
    CVE-2009-2526
    CVE-2009-2532
    CVE-2009-3103

    Disclaimer

    The information provided herein is on "as is" basis, without warranty of any kind.

    Contact Information

    Email: info@cert-in.org.in
    Phone: +91-11-2436857

    Postal address

    Indian Computer Emergency Response Team (CERT-In)
    Ministry of Electronics and Information Technology
    Government of India
    Electronics Niketan
    6, CGO Complex, Lodhi Road,
    New Delhi - 110 003
    India

     
    Indian Computer Emergency Response Team - CERT-In, Ministry of Electronics and Information Technology, Government of India.
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