Microsoft Windows helpctr.exe command execution

ms-win-helpctr-command-execution (59267) The risk level is classified as HighHigh Risk

Description:

The Microsoft Windows Help and Support Center(helpctr.exe) could allow a remote attacker to execute arbitrary commands on the system, caused by an error in the the MPC::HTML::UrlUnescapeW() function when unescaping URLs. By persuading a victim to visit a specially-crafted Web site, a remote attacker could exploit this vulnerability using an ASX file containing a HtmlView element specifying an HTML page containing a specially-crafted hcp:// URI in an IFRAME in conjunction with a cross-site scripting vulnerability in the GetServerName() function from sysinfo/commonFunc.js to bypass the FromHCP restricted whitelist and execute arbitrary commands on the system.

*CVSS:

Base Score: 9.3
  Access Vector: Network
  Access Complexity: Medium
  Authentication: None
  Confidentiality Impact: Complete
  Integrity Impact: Complete
  Availability Impact: Complete
 
Temporal Score: 7.3
  Exploitability: Proof-of-Concept
  Remediation Level: Official-Fix
  Report Confidence: Confirmed

Consequences:

Gain Access

Remedy:

Apply the appropriate patch for your system, as listed in Microsoft Security Bulletin MS10-042. See References.

References:

  • IBM Internet Security Systems Protection Alert: Microsoft Windows Help and Support Center Could Allow Remote Code Execution.
  • Microsoft Security Advisory (2219475): Vulnerability in Windows Help and Support Center Could Allow Remote Code Execution.
  • Microsoft Security Bulletin MS10-042: Vulnerability in Help and Support Center Could Allow Remote Code Execution (2229593).
  • Offensive Security Exploit Database [06-10-2010]: Microsoft Windows Help Centre Handles Malformed Escape Sequences Incorrectly.
  • Offensive Security Exploit Database [07-08-2010]: Real Player 12.0.0.879 0day for WinXP.
  • BID-40721: Microsoft Help and Support Center 'sysinfo/sysinfomain.htm' Cross Site Scripting Weakness
  • BID-40725: Microsoft Windows Help And Support Center Trusted Document Whitelist Bypass Vulnerability
  • CVE-2010-1885: The MPC::HexToNum function in helpctr.exe in Microsoft Windows Help and Support Center in Windows XP and Windows Server 2003 does not properly handle malformed escape sequences, which allows remote attackers to bypass the trusted documents whitelist (fromHCP option) and execute arbitrary commands via a crafted hcp:// URL, aka Help Center URL Validation Vulnerability.
  • SA40076: Microsoft Windows helpctr.exe Invalid URL Processing Vulnerability
  • SECTRACK ID: 1024084: Microsoft Help and Support Center URL Escaping Flaw Lets Remote Users Execute Arbitrary Commands
  • US-CERT VU#578319: Microsoft Windows Help and Support Center URI processing vulnerability

Platforms Affected:

  • Microsoft Windows Server 2003 SP2 x64
  • Microsoft Windows Server 2003 SP2 Itanium
  • Microsoft Windows Server 2003 SP2
  • Microsoft Windows XP SP3
  • Microsoft Windows XP SP2 x64 Professional
  • Microsoft Windows XP SP2
  • Real RealPlayer 12.0.0.879

Reported:

Jun 10, 2010

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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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