National Cyber Awareness System

Vulnerability Summary for CVE-2010-1885

Overview

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."

Impact

CVSS Severity (version 2.0):

CVSS Version 2 Metrics:

References to Advisories, Solutions, and Tools

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US-CERT Technical Alert: TA10-194A

Name: TA10-194A

Hyperlink:http://www.us-cert.gov/cas/techalerts/TA10-194A.html

US-CERT Vulnerability Note: VU#578319

Name: VU#578319

Hyperlink:http://www.kb.cert.org/vuls/id/578319

External Source: XF

Name: ms-win-helpctr-command-execution(59267)

Hyperlink:http://xforce.iss.net/xforce/xfdb/59267

External Source: VUPEN

Name: ADV-2010-1417

Type: Advisory

Hyperlink:http://www.vupen.com/english/advisories/2010/1417

External Source: SECTRACK

Name: 1024084

Hyperlink:http://www.securitytracker.com/id?1024084

External Source: BID

Name: 40725

Hyperlink:http://www.securityfocus.com/bid/40725

External Source: BUGTRAQ

Name: 20100610 Re: Microsoft Windows Help Centre Handles Malformed Escape Sequences Incorrectly

Hyperlink:http://www.securityfocus.com/archive/1/archive/1/511783/100/0/threaded

External Source: BUGTRAQ

Name: 20100609 Microsoft Windows Help Centre Handles Malformed Escape Sequences Incorrectly

Hyperlink:http://www.securityfocus.com/archive/1/archive/1/511774/100/0/threaded

External Source: MS

Name: MS10-042

Hyperlink:http://www.microsoft.com/technet/security/Bulletin/MS10-042.mspx

External Source: CONFIRM

Name: http://www.microsoft.com/technet/security/advisory/2219475.mspx

Type: Advisory

Hyperlink:http://www.microsoft.com/technet/security/advisory/2219475.mspx

External Source: EXPLOIT-DB

Name: 13808

Hyperlink:http://www.exploit-db.com/exploits/13808

External Source: SECUNIA

Name: 40076

Type: Advisory

Hyperlink:http://secunia.com/advisories/40076

External Source: OVAL

Name: oval:org.mitre.oval:def:11733

Hyperlink:http://oval.mitre.org/repository/data/getDef?id=oval:org.mitre.oval:def:11733

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

Hyperlink:http://blogs.technet.com/b/srd/archive/2010/06/10/help-and-support-center-vulnerability-full-disclosure-posting.aspx

External Source: MISC

Name: http://blogs.technet.com/b/msrc/archive/2010/06/10/windows-help-vulnerability-disclosure.aspx

Hyperlink:http://blogs.technet.com/b/msrc/archive/2010/06/10/windows-help-vulnerability-disclosure.aspx

External Source: FULLDISC

Name: 20100609 Microsoft Windows Help Centre Handles Malformed Escape Sequences Incorrectly

Hyperlink:http://archives.neohapsis.com/archives/fulldisclosure/2010-06/0197.html

References to Check Content

Identifier:oval:org.mitre.oval:def:11733

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

Hyperlink:http://oval.mitre.org/repository/data/DownloadDefinition?id=oval:org.mitre.oval:def:11733