65264 : Microsoft Windows hcp:// Protocol Handler MPC::HexToNum() Function String Miscalculation Arbitrary Command Execution
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Views This Week	Views All Time	Added to OSVDB	Last Modified	Modified (since 2008)	Percent Complete
15	5021	almost 3 years ago	about 2 years ago	36 times	100%

Timeline

Disclosure Date
2010-06-10

Time to Patch	Days of Exposure
38 days	33 days

Description

Microsoft Windows contains a flaw related to the 'MPC::HexToNum()' function in 'helpctr.exe' failing to properly handle escape sequences. This may allow a remote attacker to bypass the trusted documents whitelist and execute arbitrary commands via a crafted hcp:// URL directed to the sysinfomain.htm help document.

Classification

Location: Local / Remote, Context Dependent
Attack Type: Input Manipulation
Impact: Loss of Integrity
Solution: Patch / RCS, Third-Party Solution
Exploit: Exploit Public, Exploit Commercial
Disclosure: Vendor Verified, Uncoordinated Disclosure

Solution

Currently, there are no known workarounds or upgrades to correct this issue. However, Microsoft has released a patch to address this vulnerability.

Products

Microsoft Corporation	Windows Server	2003 x64 Edition SP2
		2003 SP2
		2003 SP2 for Itanium
	Windows XP	SP3
		SP2
		Professional x64 Edition SP2

References

Security Tracker: 1024084
Exploit Database: 13808
CVE ID: 2010-1885 (see also: NVD)
Microsoft Knowledge Base Article: 2229593
Secunia Advisory ID: 40076
Bugtraq ID: 40725
SCIP VulDB ID: 4139
CERT VU: 578319
ISS X-Force ID: 59267
Metasploit ID: 65264
VUPEN Advisory: ADV-2010-1417
Mail List Post: http://archives.neohapsis.com/archives/fulldisclosure/2010-06/0197.html
http://seclists.org/fulldisclosure/2010/Jun/205
Other Advisory URL: http://blogs.technet.com/b/msrc/archive/2010/06/10/windows-help-vulnerability-disclosure.aspx
http://secunia.com/blog/103/
http://www.sophos.com/blogs/sophoslabs/?p=10045
Vendor Specific News/Changelog Entry: 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.microsoft.com/technet/security/advisory/2219475.mspx
News Article: http://www.computerworld.com/s/article/9177966/Microsoft_confirms_critical_Windows_XP_bug
http://www.computerworld.com/s/article/9178084/Hackers_exploit_Windows_XP_zero_day_Microsoft_confirms
http://www.darkreading.com/vulnerability_management/security/app-security/showArticle.jhtml?articleID=225800088
http://www.scmagazineus.com/microsoft-confirms-help-center-vulnerability/article/172155/
http://www.scmagazineus.com/microsoft-fixes-ormandy-zero-day-four-other-bugs/article/174504/
Generic Exploit URL: http://www.coresecurity.com/content/microsoft-windows-helpctr-invalid-url-processing-exploit-10-5
http://www.saintcorporation.com/cgi-bin/exploit_info/windows_helpctr_fromhcp_whitelist_bypass
Microsoft Security Bulletin: MS10-042

Tools & Filters

	47710
	ie_hcp

Credit

Tavis Ormandy

CVSSv2 Score

CVSSv2 Base Score = 9.3
Source: nvd.nist.gov | Generated: 2010-06-15 | Disagree?

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