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XnView JLS File Decompression Heap Overflow
From: "Joseph Sheridan" <joe () reactionis com>
Date: Wed, 3 Oct 2012 20:21:04 +0100

XnView JLS File Decompression Heap Overflow 

Summary

XnView Formats PlugIn is prone to an overflow condition. The JLS Plugin (xjpegls.dll) library fails to properly 
sanitize user-supplied input resulting in a heap-based buffer overflow. With a specially crafted JLS compressed image 
file, a context-dependent attacker could potentially execute arbitrary code.

Advisory page: http://www.reactionpenetrationtesting.co.uk/xnview-jls-heap.html
POC file posted at: http://www.reactionpenetrationtesting.co.uk/vuln.jls

    CVE number: CVE-2012-4988
    Impact: High
    Vendor homepage: http://www.xnview.com/
    Vendor notified: 29/06/2012
    Vendor response: Fix was promised for 1.99.1 but no fix was released
    Found by: Joseph Sheridan, Director of Reaction Information Security

About ReactionIS

Reaction Information Security is a leading independent pen test consultancy specialising in delivering the highest 
quality services including network pen testing and web application security testing. As a CESG CHECK Service Provider 
we are authorised to carry out penetration testing on classified government networks.

Affected Products

XnView 1.99 and 1.99.1, 'All Plugins 1.90' and Xjpegls.dll (version 1.96.0.0) previous versions may also be affected.

Details

XnView Formats PlugIn is prone to an overflow condition. The JLS Plugin (xjpegls.dll) library fails to properly 
sanitize user-supplied input resulting in a heap-based buffer overflow. With a specially crafted JLS compressed image 
file, a context-dependent attacker could potentially execute arbitrary code.
Impact

If a user could be enticed to open a malicious JLS file, the attack could result in remote code execution.

Solution

No solution at the time of writing. Never open files from untrusted sources.
Distribution

In addition to posting on the website, a text version of this notice has been posted to the following e-mail and Usenet 
news recipients.

    bugtraq () securityfocus com
    full-disclosure () lists grok org uk 

Future updates of this advisory may or may not be actively announced on mailing lists or newsgroups. Users concerned 
about this problem are encouraged to check the advisory on our homepage at:
http://www.reactionpenetrationtesting.co.uk/xnview-jls-heap.html

Links:
http://www.reactionpenetrationtesting.co.uk
http://www.reactionpenetrationtesting.co.uk/security-whitepapers.html


Joseph Sheridan
Director
CHECK Team Leader, CREST Infrastructure, CREST Application, CISSP
Tel: 07812052515
Web: www.reactionis.co.uk 
Email: joe () reactionis co uk

Reaction Information Security Limited.
Registered in England No: 6929383
Registered Office: 1, The Mews, 69 New Dover Road, Canterbury, CT1 3DZ
 
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