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iDEFENSE Security Advisory 2011-02-08.1

iDEFENSE Security Advisory 2011-02-08.1
Posted Feb 8, 2011
Authored by iDefense Labs, Yaniv Miron, Kobi Pariente | Site idefense.com

iDefense Security Advisory 02.08.11 - Remote exploitation of a buffer overflow vulnerability in multiple versions of Microsoft Corp.'s Windows could allow attackers to execute arbitrary code on the targeted host. An integer overflow vulnerability exists in the "shimgvw" library. During the processing of an image within a certain function, a bitmap containing a large "biWidth" value can be used to cause an integer calculation overflow. This condition can lead to the overflow of a heap buffer and may result in the execute arbitrary code on the targeted host.

tags | advisory, remote, overflow, arbitrary
systems | windows
advisories | CVE-2011-3970
SHA-256 | f6124a1b8cbfad6d5655d8dd9b8857fd339410ce72f7e673b15b3fbb4d62778c

iDEFENSE Security Advisory 2011-02-08.1

Change Mirror Download
iDefense Security Advisory 02.08.11
http://labs.idefense.com/intelligence/vulnerabilities/
Feb 08, 2011

I. BACKGROUND

The Windows Picture and Fax Viewer "shimgvw.dll" library is used by
Windows Explorer to generate thumbnail previews for media files.

II. DESCRIPTION

Remote exploitation of a buffer overflow vulnerability in multiple
versions of Microsoft Corp.'s Windows could allow attackers to execute
arbitrary code on the targeted host. <BR><BR> An integer overflow
vulnerability exists in the "shimgvw" library. During the processing of
an image within a certain function, a bitmap containing a large
"biWidth" value can be used to cause an integer calculation overflow.
This condition can lead to the overflow of a heap buffer and may result
in the execute arbitrary code on the targeted host.

III. ANALYSIS

Exploitation could allow attackers to execute arbitrary code on the
targeted host under the privileges of the current logged-on user.
Successful exploitation would require the attacker to entice his or her
victim into viewing a specially-crafted thumbnail leveraging the
vulnerability. <BR><BR> Some vectors of attack include e-mail, the
browser and network shares. In an e-mail-based attack, the attacker
must entice his or her victim into opening or previewing a
specially-crafted Office document containing a specially-crafted
thumbnail. In a browser-based attack, the victim must simply view a
maliciously crafted website. In a network share attack, such as UNC or
WebDAV, an attacker would require the victim to simply navigate to the
folder containing the crafted thumbnail.

IV. DETECTION

iDefense has confirmed the existence of this vulnerability in Microsoft
Windows XP SP3. A full list of vulnerable Microsoft products can be
found in Microsoft Security Bulletin MS11-006.

V. WORKAROUND

Microsoft has included an automated Microsoft Fix it solution for the
Modify the Access Control List (ACL) on shimgvw.dll workaround, which
can be found at the following link:

http://support.microsoft.com/kb/2483185

VI. VENDOR RESPONSE

Microsoft Corp. has released patches which address this issue.
Information about downloadable vendor updates can be found by clicking
on the URLs shown.

http://www.microsoft.com/technet/security/bulletin/ms11-006.mspx

VII. CVE INFORMATION

The Common Vulnerabilities and Exposures (CVE) project has assigned the
name CVE-2011-3970 to this issue. This is a candidate for inclusion in
the CVE list (http://cve.mitre.org/), which standardizes names for
security problems.

VIII. DISCLOSURE TIMELINE

01/12/2011 Initial Vendor Notification
01/12/2011 Initial Vendor Reply
02/08/2011 Coordinated Public Disclosure

IX. CREDIT

This vulnerability was reported to iDefense by Kobi Pariente and Yaniv
Miron.

Get paid for vulnerability research
http://labs.idefense.com/methodology/vulnerability/vcp.php

Free tools, research and upcoming events
http://labs.idefense.com/

X. LEGAL NOTICES

Copyright © 2011 iDefense, Inc.

Permission is granted for the redistribution of this alert
electronically. It may not be edited in any way without the express
written consent of iDefense. If you wish to reprint the whole or any
part of this alert in any other medium other than electronically,
please e-mail customerservice@idefense.com for permission.

Disclaimer: The information in the advisory is believed to be accurate
at the time of publishing based on currently available information. Use
of the information constitutes acceptance for use in an AS IS condition.
There are no warranties with regard to this information. Neither the
author nor the publisher accepts any liability for any direct,
indirect, or consequential loss or damage arising from use of, or
reliance on, this information.
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