Maurycy Prodeus 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 the VBScript "MsgBox()" function allowing the execution of arbitrary HLP files. This can be exploited to execute an HLP file from e.g. an SMB share by tricking a user into pressing F1 when viewing a specially crafted website.

Successful exploitation allows execution of arbitrary commands via HLP macros.

The vulnerability is confirmed with Internet Explorer 7 on a fully patched Windows XP SP3, and additionally reported in Windows 2000 and Windows Server 2003.

Solution
Apply patches.
Further details available to Secunia VIM customers

Provided and/or discovered by
Maurycy Prodeus, iSEC Security Research

Changelog
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Original Advisory
Microsoft:
http://www.microsoft.com/technet/security/advisory/981169.mspx
http://blogs.technet.com/msrc/archive/2010/02/28/investigating-a-new-win32hlp-and-internet-explorer-issue.aspx
http://blogs.technet.com/srd/archive/2010/03/01/help-keypress-vulnerability-in-vbscript-enabling-remote-code-execution.aspx

MS10-022 (KB981169, KB981350, KB981350, KB981349):
http://www.microsoft.com/technet/security/bulletin/MS10-022.mspx

iSEC Security Research:
http://www.isec.pl/vulnerabilities/isec-0027-msgbox-helpfile-ie.txt

Other references
Further details available to Secunia VIM customers

Deep Links
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