Vulnerability CVE-2010-1885
Published: 2010-06-15   Modified: 2012-02-13

Description:
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."

See advisories in our WLB2 database:
Topic
Author
Date
High
Microsoft Windows Help Centre Handles Malformed Escape Sequences Incorrectly
Tavis Ormandy
16.06.2010

Type:

CWE-78

 (Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection') )

CVSS2 => (AV:N/AC:M/Au:N/C:C/I:C/A:C)

CVSS Base Score
Impact Subscore
Exploitability Subscore
9.3/10
10/10
8.6/10
Exploit range
Attack complexity
Authentication
Remote
Medium
No required
Confidentiality impact
Integrity impact
Availability impact
Complete
Complete
Complete
Affected software
Microsoft -> Windows 2003 server 
Microsoft -> Windows server 2003 
Microsoft -> Windows xp 

 References:
http://archives.neohapsis.com/archives/fulldisclosure/2010-06/0197.html
http://blogs.technet.com/b/msrc/archive/2010/06/10/windows-help-vulnerability-disclosure.aspx
http://blogs.technet.com/b/srd/archive/2010/06/10/help-and-support-center-vulnerability-full-disclosure-posting.aspx
http://www.exploit-db.com/exploits/13808
http://www.kb.cert.org/vuls/id/578319
http://www.microsoft.com/technet/security/advisory/2219475.mspx
http://www.securityfocus.com/archive/1/511774/100/0/threaded
http://www.securityfocus.com/archive/1/511783/100/0/threaded
http://www.securityfocus.com/bid/40725
http://www.securitytracker.com/id?1024084
http://www.us-cert.gov/cas/techalerts/TA10-194A.html
http://www.vupen.com/english/advisories/2010/1417
https://docs.microsoft.com/en-us/security-updates/securitybulletins/2010/ms10-042
https://exchange.xforce.ibmcloud.com/vulnerabilities/59267
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A11733
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