[Full-disclosure] iDefense Security Advisory 10.05.06: Symantec AntiVirus IOCTL Kernel Privilege Escalation Vulnerability

2006-10-05T00:00:00
ID SECURITYVULNS:DOC:14563
Type securityvulns
Reporter Securityvulns
Modified 2006-10-05T00:00:00

Description

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 Ruben Santamarta of reversemode.com.

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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.


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