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TITLE:
Microsoft Windows "MsgBox()" HLP File Execution Vulnerability

SECUNIA ADVISORY ID:
SA38727

VERIFY ADVISORY:
http://secunia.com/advisories/38727/

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. Other versions may also be affected.

SOLUTION:
Avoid pressing F1 on untrusted websites. Disable Active Scripting
support.

PROVIDED AND/OR DISCOVERED BY:
Maurycy Prodeus, iSEC Security Research

ORIGINAL ADVISORY:
Microsoft:
http://blogs.technet.com/msrc/archive/2010/02/28/investigating-a-new-win32hlp-and-internet-explorer-issue.aspx

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

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