Opera Software Opera Web Browser Transfer Item Pop-up Menu Stack Overflow Vulnerability iDefense Security Advisory 05.23.07 http://labs.idefense.com/intelligence/vulnerabilities/ May 23, 2007 I. BACKGROUND Opera is a cross-platform web browser. More information is available at http://www.opera.com/ II. 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. III. 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. IV. DETECTION iDefense has confirmed the existence of this vulnerability in the Opera version 9.2 for Windows. Previous versions may also be affected. V. WORKAROUND iDefense is not currently aware of a work around for this issue. VI. 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/ VII. CVE INFORMATION A Mitre Corp. Common Vulnerabilities and Exposures (CVE) number has not been assigned yet. VIII. DISCLOSURE TIMELINE 05/08/2007 Initial vendor notification 05/08/2007 Initial vendor response 05/23/2007 Coordinated public disclosure IX. CREDIT This vulnerability was reported to iDefense by enhalos. 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 © 2007 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@xxxxxxxxxxxx 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.
