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Category:   Application (Web Browser)  >   Opera Vendors:   Opera Software
Opera JPEG DHT Marker Buffer Overflow and createSVGTransformFromMatrix Request Validation Flaw Lets Remote Users Execute Arbitrary Code
SecurityTracker Alert ID:  1017473
SecurityTracker URL:
CVE Reference:   CVE-2007-0126, CVE-2007-0127   (Links to External Site)
Updated:  May 20 2008
Original Entry Date:  Jan 5 2007
Impact:   Execution of arbitrary code via network, User access via network
Fix Available:  Yes  Vendor Confirmed:  Yes  
Version(s): prior to 9.10
Description:   Two vulnerabilities were reported in Opera. A remote user can cause arbitrary code to be executed on the target user's system.

A remote user can create a specially crafted JPEG image that, when loaded by the target user, will trigger a heap overflow and execute arbitrary code on the target system. The code will run with the privileges of the target user.

A specially crafted JPEG DHT marker can trigger the flaw.

Christoph Diehl reported this vulnerability to iDefense.

A remote user can create Javascript with a specially crafted createSVGTransformFromMatrix request parameter that, when processed by the target user, will execute arbitrary code on the target system. The code will run with the privileges of the target user.

The vendor was notified of both vulnerabilities on November 16, 2006.

The original advisories are available at:

Impact:   A remote user can create a JPEG file or Javascript that, when loaded by the target user, will execute arbitrary code on the target user's system.
Solution:   The vendor has issued a fixed version (9.10).

The Opera advisory is available at:

Vendor URL: (Links to External Site)
Cause:   Boundary error, Input validation error
Underlying OS:  Linux (Any), Windows (Any)

Message History:   None.

 Source Message Contents

Subject:  iDefense Security Advisory 01.05.07: Opera Software Opera Web Browser

Opera Software Opera Web Browser JPG Image DHT Marker Heap Corruption

iDefense Security Advisory 01.05.07
Jan 05, 2007


Opera is a cross-platform web browser. More information is available at


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


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.


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


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


Opera Software has addressed this vulnerability in version 9.10. More
information is available at the following link.


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


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


This vulnerability was reported to iDefense by Christoph Diehl.

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Copyright  2006 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 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


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