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Insecure Library Loading
Moderately critical

Microsoft Windows "MsgBox()" HLP File Execution Vulnerability

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Description


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

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

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 "MsgBox()" HLP File Execution Vulnerability

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