Microsoft Windows Server CIFS code execution

ms-win-server-browser-bo (65376) The risk level is classified as HighHigh Risk

Description:

Microsoft Windows Server could allow a remote attacker to execute arbitrary code on the system, caused by the improper parsing of Computer Browser messages by the Common Internet File System (CIFS) Browser Protocol implementation. By sending a specially-crafted browser message, a remote attacker could exploit this vulnerability to corrupt the browser pool to execute arbitrary code on the system with system-level privileges.

*CVSS:

Base Score: 10
  Access Vector: Network
  Access Complexity: Low
  Authentication: None
  Confidentiality Impact: Complete
  Integrity Impact: Complete
  Availability Impact: Complete
 
Temporal Score: 7.4
  Exploitability: Proof-of-Concept
  Remediation Level: Official-Fix
  Report Confidence: Uncorroborated

Consequences:

Gain Access

Remedy:

Apply the appropriate patch for your system, as listed in the latest Microsoft Security Bulletin. See References.

— OR —

Use Microsoft Automatic Update if it is supported by your operating system. The original bulletin issued by Microsoft has been superseded.

References:

  • Microsoft Security Bulletin MS11-019: Vulnerabilities in SMB Client Could Allow Remote Code Execution (2511455).
  • Microsoft Security Bulletin MS11-043: Vulnerability in SMB Client Could Allow Remote Code Execution (2536276).
  • Offensive Security Exploit Database [02-14-2011]: MS Windows Server 2003 AD Pre-Auth BROWSER ELECTION Remote Heap Overflow.
  • The Microsoft Security Response Center (MSRC): Notes on exploitability of the recent Windows BROWSER protocol issue.
  • BID-46360: Microsoft Windows 'BROWSER ELECTION' Buffer Overflow Vulnerability
  • CVE-2011-0654: Integer underflow in the BowserWriteErrorLogEntry function in the Common Internet File System (CIFS) browser service in Mrxsmb.sys or bowser.sys in Active Directory 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 allows remote attackers to execute arbitrary code or cause a denial of service (system crash) via a malformed BROWSER ELECTION message, leading to a heap-based buffer overflow, aka Browser Pool Corruption Vulnerability. NOTE: some of these details are obtained from third party information.
  • OSVDB ID: 70881: Microsoft Windows SMB Browser Election Request Server Name String Overflow
  • SA43299: Microsoft Windows SMB Browser Election Request Parsing Vulnerability
  • US-CERT VU#323172: Microsoft Windows browser election message kernel pool overflow

Platforms Affected:

  • Microsoft Windows 7 x32
  • Microsoft Windows 7 x64
  • Microsoft Windows Server 2003 SP2 x64
  • Microsoft Windows Server 2003 SP2 Itanium
  • Microsoft Windows Server 2003 SP2
  • Microsoft Windows Server 2008 R2 x64
  • Microsoft Windows Server 2008 x64
  • Microsoft Windows Server 2008 x32
  • Microsoft Windows Server 2008 Itanium
  • Microsoft Windows Server 2008 R2 Itanium
  • Microsoft Windows Server 2008 SP2 Itanium
  • Microsoft Windows Server 2008 SP2 x64
  • Microsoft Windows Server 2008 SP2 x32
  • Microsoft Windows Vista SP1 x64
  • Microsoft Windows Vista SP1
  • Microsoft Windows Vista SP2
  • Microsoft Windows Vista SP2 x64
  • Microsoft Windows XP SP2 x64 Professional
  • Microsoft Windows XP SP3

Reported:

Feb 14, 2011

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The information within this database may change without notice. Use of this information constitutes acceptance for use in an AS IS condition. There are NO warranties, implied or otherwise, with regard to this information or its use. Any use of this information is at the user's risk. In no event shall IBM be held liable for any damages whatsoever arising out of or in connection with the use or spread of this information.

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