Symantec AntiVirus IOCTL Kernel Privilege Escalation Vulnerability
iDefense Security Advisory 10.05.06 http://www.idefense.com/intelligence/vulnerabilities/ Oct 05, 2006
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/
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.
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.
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.
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:
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
This vulnerability was reported to iDefense by Ruben Santamarta of reversemode.com.
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X. LEGAL NOTICES
Copyright © 2006 iDefense, Inc.
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