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-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2006.0736 -- [Win] Symantec AntiVirus IOCTL Kernel Privilege Escalation Vulnerability 6 October 2006 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: Symantec Client Security version 10 and prior Publisher: iDEFENSE Operating System: Windows Impact: Administrator Compromise Access: Existing Account CVE Names: CVE-2006-4927 Original Bulletin: http://www.idefense.com/intelligence/vulnerabilities/display.php?id=417 http://www.symantec.com/avcenter/security/Content/2006.10.05a.html - --------------------------BEGIN INCLUDED TEXT-------------------- Symantec AntiVirus IOCTL Kernel Privilege Escalation Vulnerability iDefense Security Advisory 10.05.06 http://www.idefense.com/intelligence/vulnerabilities/ Oct 05, 2006 I. BACKGROUND Symantec has a wide range of Anti-Virus and Internet Security products that are designed to protect users from viruses and other harmful software. More information can be found on the Symantec site at http://www.symantec.com/ II. DESCRIPTION Local exploitation of a design error vulnerability in Symantec Corp. AntiVirus can allow an attacker to execute arbitrary code with kernel privileges. The vulnerability specifically exists due to improper address space validation when the NAVENG and NAVEX15 device drivers process IOCTL 0x222AD3, 0x222AD7, and 0x222ADB. An attacker can overwrite a user supplied address, including code segments, with a constant double word value by supplying a specially crafted Irp to the IOCTL handler function. III. ANALYSIS Successful exploitation allows an attacker to obtain elevated privileges by exploiting the kernel. This could allow the attacker to gain control of the affected system. However, local access is required for exploitation to be successful. Note that since the attacker can only overwrite with a constant double- word value, exploitation is not completely straight forward. However, this does not significantly impact the difficulty of exploitation since code segments can be overwritten within the kernel. iDefense has assigned a MEDIUM severity due to the requirement for local access and the ability to execute arbitrary code within the kernel. IV. DETECTION iDefense has confirmed the existence of this vulnerability within version 10 of Symantec Client Security as of this writing. Previous versions, as well as relating products, which contain the NAVENG.SYS and NAVEX15.SYS drivers are suspected to be vulnerable as well. V. WORKAROUND iDefense is currently unaware of any effective workaround for this issue. VI. VENDOR RESPONSE Symantec has released updated device drivers via LiveUpdate. More information regarding this issue can be found in Symantec's advisory, SYM06-020. You can find their advisory at the following link: http://www.symantec.com/avcenter/security/Content/2006.10.05a.html VII. CVE INFORMATION The Common Vulnerabilities and Exposures (CVE) project has assigned the name CVE-2006-4927 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 09/19/2006 Initial vendor notification 09/19/2006 Initial vendor response 10/05/2006 Coordinated public disclosure IX. CREDIT This vulnerability was reported to iDefense by Rubén Santamarta of reversemode.com. 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. 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 iQCVAwUBRSWYuyh9+71yA2DNAQJGygP9Ej958SaLqXcRlxUlRR9DR3AyxdcZmWdi MooEVL0ooLa4Pvx8LdTsfbfKYUUb5icUnEJvc0h24Pw+5Jv3wuvMcNX11gdpwEev 7Dpql8A4RrhV9SWikIpjyZDYuQiYawImkgPXHuGjvZbgQBuOziJa8TzNV4gBHbok zDDkrSc4m10= =WVXC -----END PGP SIGNATURE-----