Protect yourself against future threats.
-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2007.0545 -- [Win][UNIX/Linux] Opera Software Opera Web Browser BitTorrent Dangling Pointer Vulnerability 20 July 2007 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: Opera Web Browser 9.21 and prior Publisher: iDefense Operating System: UNIX variants (UNIX, Linux, OSX) Windows Impact: Execute Arbitrary Code/Commands Access: Remote/Unauthenticated Original Bulletin: http://labs.idefense.com/intelligence/vulnerabilities/display.php?id=564 http://www.opera.com/support/search/view/862/ Comment: This exploit requires the user to remove a malicious torrent file from the download manager in Opera. - --------------------------BEGIN INCLUDED TEXT-------------------- Opera Software Opera Web Browser BitTorrent Dangling Pointer Vulnerability iDefense Security Advisory 07.19.07 http://labs.idefense.com/intelligence/vulnerabilities/ Jul 19, 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 dangling pointer vulnerability in Opera Software ASA's Opera web browser could allow an attacker to execute arbitrary code with the privileges of the logged in user. Opera 9.2 supports BitTorrent downloads. When parsing a specially crafted BitTorrent header, Opera uses memory that has already been freed. This can result in an invalid object pointer being dereferenced, and may allow for the execution of arbitrary code. The vulnerability is triggered when the user right clicks on the transfer and removes it. III. ANALYSIS Exploitation of this vulnerability allows an attacker to execute arbitrary code on the affected host with the privileges of the logged in user. The attacker must persuade a vulnerable user into clicking a link to a BitTorrent file. The targeted user must subsequently remove the entry from the download pane. The requirement to remove the torrent 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. IV. DETECTION iDefense has confirmed the existence of this vulnerability in Opera version 9.21 on Windows. Previous versions may also be affected. V. WORKAROUND iDefense is currently unaware of any workarounds for this issue. VI. VENDOR RESPONSE Version 9.22 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/862/ VII. CVE INFORMATION A Mitre Corp. Common Vulnerabilities and Exposures (CVE) number has not been assigned yet. VIII. DISCLOSURE TIMELINE 06/06/2007 Initial vendor notification 06/06/2007 Initial vendor response 07/19/2007 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@idefense.com 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. - --------------------------END INCLUDED TEXT-------------------- You have received this e-mail bulletin as a result of your organisation's registration with AusCERT. The mailing list you are subscribed to is maintained within your organisation, so if you do not wish to continue receiving these bulletins you should contact your local IT manager. If you do not know who that is, please send an email to auscert@auscert.org.au and we will forward your request to the appropriate person. NOTE: Third Party Rights This security bulletin is provided as a service to AusCERT's members. As AusCERT did not write the document quoted above, AusCERT has had no control over its content. The decision to follow or act on information or advice contained in this security bulletin is the responsibility of each user or organisation, and should be considered in accordance with your organisation's site policies and procedures. AusCERT takes no responsibility for consequences which may arise from following or acting on information or advice contained in this security bulletin. NOTE: This is only the original release of the security bulletin. It may not be updated when updates to the original are made. If downloading at a later date, it is recommended that the bulletin is retrieved directly from the author's website to ensure that the information is still current. Contact information for the authors of the original document is included in the Security Bulletin above. If you have any questions or need further information, please contact them directly. Previous advisories and external security bulletins can be retrieved from: http://www.auscert.org.au/render.html?cid=1980 If you believe that your computer system has been compromised or attacked in any way, we encourage you to let us know by completing the secure National IT Incident Reporting Form at: http://www.auscert.org.au/render.html?it=3192 =========================================================================== Australian Computer Emergency Response Team The University of Queensland Brisbane Qld 4072 Internet Email: auscert@auscert.org.au Facsimile: (07) 3365 7031 Telephone: (07) 3365 4417 (International: +61 7 3365 4417) AusCERT personnel answer during Queensland business hours which are GMT+10:00 (AEST). On call after hours for member emergencies only. =========================================================================== -----BEGIN PGP SIGNATURE----- Comment: http://www.auscert.org.au/render.html?it=1967 iQCVAwUBRqAKQyh9+71yA2DNAQKVMwP8DcN6h4RRPyc6E0mZrbzV35LhcpCGd6jv 9kFgwkrLGMJ1N8tEQ+11gIWFSrvHRQy9hyLisa6GvZBG1Wmp6Xwlc52nwhCHBJUT E3VCZX1EVwRVymMC1tui00/oNzmXN2SeTMJ771dqUPu7j7MXLiimmXRvpGnALWvm fj7U344CI4U= =uoKE -----END PGP SIGNATURE-----