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Last updated: 5/3/2016 11:59:52 AM

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Vulnerability Summary for CVE-2010-1885

Original release date: 06/15/2010
Last revised: 09/17/2010


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."


CVSS Severity (version 2.0):
CVSS v2 Base Score: 9.3 HIGH
Impact Subscore: 10.0
Exploitability Subscore: 8.6
CVSS Version 2 Metrics:
Access Vector: Network exploitable - Victim must voluntarily interact with attack mechanism
Access Complexity: Medium
Authentication: Not required to exploit
Impact Type: Allows unauthorized disclosure of information; Allows unauthorized modification; Allows disruption of service
Per: http://blogs.technet.com/b/msrc/archive/2010/06/10/windows-help-vulnerability-disclosure.aspx "customers running Windows Vista, Windows 7, Windows Server 2008, and Windows Server 2008 R2, are not vulnerable to this issue, or at risk of attack."

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External Source: XF
Name: ms-win-helpctr-command-execution(59267)
External Source: MISC
Name: http://blogs.technet.com/b/msrc/archive/2010/06/10/windows-help-vulnerability-disclosure.aspx
External Source: EXPLOIT-DB
Name: 13808
External Source: CONFIRM
Name: http://blogs.technet.com/b/srd/archive/2010/06/10/help-and-support-center-vulnerability-full-disclosure-posting.aspx
Type: Advisory
External Source: VUPEN
Name: ADV-2010-1417
Type: Advisory
External Source: BUGTRAQ
Name: 20100610 Re: Microsoft Windows Help Centre Handles Malformed Escape Sequences Incorrectly
US-CERT Vulnerability Note: CERT-VN
Name: VU#578319
External Source: CONFIRM
Name: http://www.microsoft.com/technet/security/advisory/2219475.mspx
Type: Advisory
External Source: FULLDISC
Name: 20100609 Microsoft Windows Help Centre Handles Malformed Escape Sequences Incorrectly
External Source: BID
Name: 40725
External Source: OVAL
Name: oval:org.mitre.oval:def:11733
External Source: MS
Name: MS10-042
US-CERT Vulnerability Note: CERT
Name: TA10-194A
External Source: BUGTRAQ
Name: 20100609 Microsoft Windows Help Centre Handles Malformed Escape Sequences Incorrectly
External Source: SECTRACK
Name: 1024084

References to Check Content

Identifier: oval:org.mitre.oval:def:11733
Check System: http://oval.mitre.org/XMLSchema/oval-definitions-5

Technical Details

Vulnerability Type (View All)
  • OS Command Injections (CWE-78)