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-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2006.0796 -- [Win][Linux] Sophos Anti-Virus Petite File Denial of Service Vulnerability 1 November 2006 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: Sophos Anti-Virus 5.1 for Windows Sophos Anti-Virus 5 for Linux Publisher: iDEFENSE Operating System: Windows Linux variants Impact: Denial of Service Access: Remote/Unauthenticated CVE Names: CVE-2006-4839 Original Bulletin: http://labs.idefense.com/intelligence/vulnerabilities/display.php?id=438 - --------------------------BEGIN INCLUDED TEXT-------------------- Sophos Anti-Virus Petite File Denial of Service Vulnerability iDefense Security Advisory 10.31.06 http://www.idefense.com/intelligence/vulnerabilities/ Oct 31, 2006 I. BACKGROUND Sophos Anti-Virus is comprehensive scanning solution used to protect users from viruses, malicious code, ad-ware, trojans, and more. For more information see their website at http://sophos.com/ II. DESCRIPTION Remote exploitation of a denial of service vulnerability in version 5.1 of Sophos Anti-Virus could result in unusable system conditions. The problem manifests itself when the scanning engine encounters an executable compressed with petite that contains a large number of sections. III. ANALYSIS Successful exploitation would result in the scanning engine attempting to allocate an extremely large amount of memory resulting in memory exhaustion on the system in question. The auto-scan features of Sophos Anti-Virus will attempt to scan files on access. IV. DETECTION iDefense has confirmed the existence of this issue with Sophos Anti-Virus 5.1 for Windows as well as version 5 for Linux. It is suspected that earlier versions and other architectures are also vulnerable. V. WORKAROUND iDefense is unaware for any effective workarounds for this issue. VI. VENDOR RESPONSE Sophos recommends upgrading to an unaffected version of the scan engine. For more information consult the following support article. http://www.sophos.com/support/knowledgebase/article/7609.html VII. CVE INFORMATION The Common Vulnerabilities and Exposures (CVE) project has assigned the name CVE-2006-4839 to this issue. This is a candidate for inclusion in the CVE list (http://cve.mitre.org), which standardizes names for security problems. VIII. DISCLOSURE TIMELINE 09/15/2006 Initial vendor notification 09/19/2006 Initial vendor response 10/31/2006 Coordinated public disclosure IX. CREDIT This vulnerability was reported to iDefense by Damian Put <pucik@overflow.pl>. Get paid for vulnerability research http://www.idefense.com/methodology/vulnerability/vcp.php Free tools, research and upcoming events http://labs.idefense.com/ X. LEGAL NOTICES 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 email 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. 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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 iQCVAwUBRUgBEyh9+71yA2DNAQL8HwP+OIx26xuEIxAWUf0zpVZQQtoBch8sBtUT csGlskLgdI5ZB9lYcg5pxgj2eGtnZJSoj5BWLXNhsgI2qDwH12dZhVTRM5zoFzoX QlEKyxOPuMa0+PSEFwYc+wjMxHuV7FrX9M6wl6drM9AOReyH7MPY5Dm+CQU4tFAb oYw5A85Yoi8= =IgfM -----END PGP SIGNATURE-----