[NT] Microsoft Office Works Converter Stack-based Buffer Overflow Vulnerability

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Date: 13 Feb 2008 13:14:02 +0200

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Microsoft Office Works Converter Stack-based Buffer Overflow Vulnerability
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SUMMARY

<http://office.microsoft.com/> Microsoft Word is "a word processing
application which is heavily used in corporate environments. Word comes
with Office Converters that allow it to import files from various formats
such as old versions of other word processing software". Remote
exploitation of a buffer overflow vulnerability in Microsoft Corp.'s Works
Converter allows attackers to execute arbitrary code as the current user.

DETAILS

Vulnerable Systems:
* Microsoft Office 2003 with wkcvqd01.dll version 7.03.0616.0

This vulnerability stems from improper input validation of section length
headers when converting a Microsoft Works document (WPS extension) to Rich
Text Format (RTF). When certain fields are modified, such as the length or
count values, a stack-based buffer overflow occurs. This leads to a
directly exploitable condition.

Analysis:
Exploitation allows attackers to execute arbitrary code as the user that
converts a specially crafted Works document.

Exploitation might require the installation of additional Microsoft Office
components. When installing Microsoft Office, there are several
installation options for converters. In corporate environments, the
required components are usually set to be installed from the hard drive on
first use. However, one of the installation options causes a request for
the installation media. If this option is used, the media prompt may help
mitigate exploitation.

In order to exploit this vulnerability, the targeted user must manually
choose to open the malformed Works document in Microsoft Word. The file
extension is not registered by default.

Vendor response:
Microsoft has officially addressed this vulnerability with Security
Bulletin MS08-011. For more information, consult their bulletin at the
following URL:
<http://www.microsoft.com/technet/security/Bulletin/ms08-011.mspx>
http://www.microsoft.com/technet/security/Bulletin/ms08-011.mspx

CVE Information:
<http://www.cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2008-0108>
CVE-2008-0108

Disclosure Timeline:
06/14/2007 - Initial vendor notification
06/14/2007 - Initial vendor response
02/12/2008 - Coordinated public disclosure

ADDITIONAL INFORMATION

The information has been provided by iDefense Labs.
The original article can be found at:
<http://labs.idefense.com/intelligence/vulnerabilities/display.php?id=660>
http://labs.idefense.com/intelligence/vulnerabilities/display.php?id=660

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