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Opera Software Opera Web Browser Transfer Item Pop-up Menu Stack Overflow Vulnerability

05.23.07

BACKGROUND

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

DESCRIPTION

Remote exploitation of a stack-based buffer overflow in Opera Software ASA's Opera Web browser could allow an attacker to execute arbitrary code on the affected host.

Opera 9.2 supports BitTorrent downloads. If a server sends the browser a specially crafted BitTorrent header, it can lead to a buffer overflow. The buffer overflow is triggered when the user right clicks on the item in the download pane.

ANALYSIS

Exploitation of this vulnerability allows an attacker to execute arbitrary code on the affected host.

The attacker must convince the vulnerable user into clicking a link to a BitTorrent file. The victim must then subsequently right click on the entry within the download pane. The requirement to right-click is not considered to be a mitigating factor since it is natural for a user to attempt to do so when a transfer is not progressing.

DETECTION

iDefense has confirmed the existence of this vulnerability in the Opera version 9.2 for Windows. Previous versions may also be affected.

WORKAROUND

iDefense is not currently aware of a work around for this issue.

VENDOR RESPONSE

Version 9.21 of Opera has been released to address this issue. More information can be found at the following URL.

http://www.opera.com/support/search/view/860/

CVE INFORMATION

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

DISCLOSURE TIMELINE

05/08/2007 Initial vendor notification
05/08/2007 Initial vendor response
05/23/2007 Coordinated public disclosure

CREDIT

This vulnerability was reported to iDefense by enhalos.

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LEGAL NOTICES

Copyright © 2007 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.