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Highly critical

Microsoft Windows Help and Support Center URL Processing Vulnerability

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Release Date:  2010-06-10    Last Update:  2010-07-13    Views:  16,417

Secunia Advisory SA40076

Where:

From remote

Impact:

System access

Solution Status:

Vendor Patch

CVE Reference(s):

Description


Tavis Ormandy has discovered a vulnerability in Microsoft Windows, which can be exploited by malicious people to compromise a user's system.

The vulnerability is caused due to an error when processing escaped URLs through Microsoft Windows Help and Support Center (helpctr.exe). This can be exploited to bypass restrictions normally imposed by the "-FromHCP" command-line argument and pass arbitrary parameters to local help documents.

Successful exploitation allows execution of arbitrary commands through the use of an additional input sanitation error in the sysinfomain.htm help document when opening a specially crafted "hcp://" URL.

The vulnerability is confirmed in Windows XP SP3 with Windows Media Player 9 and Internet Explorer 8. Windows Server 2003 is also reportedly affected.


Solution:
Apply patches.

Further details available to Secunia VIM customers

Provided and/or discovered by:
Tavis Ormandy

Original Advisory:
MS10-042 (KB2229593):
http://www.microsoft.com/technet/security/bulletin/ms10-042.mspx

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

Deep Links:
Links available to Secunia VIM customers

Do you have additional information related to this advisory?

Please provide information about patches, mitigating factors, new versions, exploits, faulty patches, links, and other relevant data by posting comments to this Advisory. You can also send this information to vuln@secunia.com

Subject: Microsoft Windows Help and Support Center URL Processing Vulnerability

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