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April 27, 2005
Symantec AntiVirus RAR archive bypass

Revision History

Risk Impact

A vulnerability has been identified in the Windows version of the Symantec Antivirus component responsible for decomposition of encoded / archived content. The vulnerability causes the decomposer component to crash when a unique RAR file is received for decomposing and scanning. Malicious content placed inside such a configured RAR file can be bypassed and not detected by the initial file scan. The bypassed malicious content does not pose a risk until extracted from the RAR archive file. The malicious content will be detected and eliminated by RealTime Virus Scan / Auto-Protect when it is extracted from the RAR file on systems running Symantec Antivirus.

Symantec Response
The vulnerability has been traced to a particular component build environment that was in use for a limited period. The vulnerable version affected Microsoft Windows builds only.

Affected Products

Enterprise Products

Product Vulnerable Build Fixed Build
Symantec Web Security
Symantec Mail Security for SMTP
Symantec AntiVirus Scan Engine
Symantec SAV/Filter for Domino NT
Symantec Mail Security for Exchange

Consumer Products

Product Vulnerable Build Fixed Build
Symantec Norton AntiVirus 2005 11.0.0 11.0.9
Symantec Norton Internet Security 2005 Contains NAV 11.0.0 Fixed with NAV 11.0.9
Symantec Norton System Works 2005 Contains NAV 11.0.0 Fixed with NAV 11.0.9

Note: Only Symantec products indicated above are potentially vulnerable. All other Symantec products are NOT affected.

As a part of normal best practices, users should keep vendor-supplied patches for all application software and operating systems up-to-date. Symantec strongly recommends any affected customers, if they are not already running a non-vulnerable product version/build, update their product immediately to protect against these types of threats.

Updates are available either through Symantec's LiveUpdate for those products that have LiveUpdate capability or from the Symantec Support site at http://www.symantec.com/techsupp.

Symantec is not aware of any active attempts against or organizations impacted by this issue.

Symantec would like to thank André Jerleke a.k.a. Phiberz -- phibers@hotmail.com for bringing this issue to our attention.

Symantec takes the security and proper functionality of our products very seriously. As founding members of the Organization for Internet Safety (OISafety), Symantec supports and follows the principles of responsible disclosure. Symantec also subscribes to the vulnerability disclosure guidelines outlined by the National Infrastructure Advisory Council (NIAC).

Please contact secure@symantec.com if you feel you have discovered a security issue in a Symantec product. A Symantec Product Security team member will contact you regarding your submission. Symantec strongly recommends using encrypted email for reporting vulnerability information to secure@symantec.com. The Symantec Product Security PGP key can be found at the end of this message.

Symantec has developed a Product Vulnerability Response document outlining the process we follow in addressing suspected vulnerabilities in our products. This document is available below.

PDF Symantec Vulnerability Response Policy PGP Symantec Product Vulnerability Management PGP Key

Copyright © by Symantec Corp.
Permission to redistribute this alert electronically is granted as long as it is not edited in any way unless authorized by Symantec Security Response. Reprinting the whole or part of this alert in any medium other than electronically requires permission from secure@symantec.com.

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.

Symantec, Symantec products, Symantec Security Response, and secure@symantec.com are registered trademarks of Symantec Corp. and/or affiliated companies in the United States and other countries. All other registered and unregistered trademarks represented in this document are the sole property of their respective companies/owners.

Last modified on: Wednesday, 27-Apr-2005 16:41:18 PDT
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