Public Vulnerability Reports

Opera Software Opera Web Browser JPG Image DHT Marker Heap Corruption Vulnerability

01.05.07

BACKGROUND

Opera is a cross-platform web browser. More information is available at http://www.opera.com/

DESCRIPTION

Remote exploitation of a heap overflow in Opera Software ASA's Opera Web browser could allow an attacker to execute arbitrary code in the security context of the current user.

The vulnerability specifically exists due to Opera improperly processing a JPEG DHT marker. The DHT marker is used to define a Huffman Table which is used for decoding the image data. An invalid number of index bytes in the DHT marker will trigger a heap overflow with partially user controlled data.

ANALYSIS

Exploitation of this vulnerability would allow an attacker to execute arbitrary code on the affected host. The attacker would first need to construct a website containing the malicious image and trick the vulnerable user into visiting the site. This would trigger the vulnerability and allow the code to execute with the privileges of the local user.

DETECTION

iDefense has confirmed the existence of this vulnerability in Opera version 9.02 on both Windows and Linux. Previous versions may also be affected.

WORKAROUND

iDefense is currently unaware of any effective workarounds for this issue.

VENDOR RESPONSE

Opera Software has addressed this vulnerability in version 9.10. More information is available at the following link. http://www.opera.com/support/search/supsearch.dml?index=852

CVE INFORMATION

A Mitre Corp. Common Vulnerabilities and Exposures (CVE) number has not been assigned yet.

DISCLOSURE TIMELINE

11/16/2006 Initial vendor notification
11/17/2006 Initial vendor response
01/05/2007 Coordinated public disclosure

CREDIT

This vulnerability was reported to iDefense by Christoph Diehl.

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LEGAL NOTICES

Copyright © 2006 Verisign, Inc.

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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.