McAfee WebShield SMTP Format String Vulnerability

Risk: High
Local: No
Remote: Yes

CVSS Base Score: 10/10
Impact Subscore: 10/10
Exploitability Subscore: 10/10
Exploit range: Remote
Attack complexity: Low
Authentication: No required
Confidentiality impact: Complete
Integrity impact: Complete
Availability impact: Complete

Symantec Vulnerability Research Security Advisory Advisory ID : SYMSA-2006-002 Advisory Name: McAfee WebShield SMTP Format String Vulnerability Release Date : 04-03-2005 Application : McAfee WebShield SMTP 4.5 MR1a Platform : Microsoft Windows Severity : System access / remotely exploitable Author : Ollie Whitehouse / ollie_whitehouse (at) symantec (dot) com [email concealed] Vendor status: Vendor verified, patch available. CVE Number : CVE-2006-0559 Reference : Overview: There exists a format string vulnerability within the McAfee WebShield SMTP server which allows an attacker to execute arbitrary code on the host computer via an unauthenticated connection. With successful exploitation, an unauthenticated attacker is able to obtain SYSTEM access. Details: A format string vulnerability exists in the function which handles the construction of the bounce messages for non-existent domains. On the way into the mail system this causes no problems (correct usage of the printf() family of functions). However, when the file ??(13digitfilename).rcp?? is picked up from the OUT directory to construct the bounce message, a format string in the original destination address for the mail will trigger the vulnerability. Successful exploitation can lead to remote code execution. Vendor Response: The above vulnerability was addressed via a patch (P0803) that was released in August 2003 for Webshield SMTP 4.5 MR1a. This vulnerability has also been fixed in the latest release of the product, Webshield SMTP 4.5 MR2. Licensed and evaluation versions of Webshield SMTP 4.5 MR2 are available for customer download from the McAfee website at If there are any further questions about this statement, please contact McAfee support. Recommendation: Apply the patch supplied by the vendor. Common Vulnerabilities and Exposures (CVE) Information: The Common Vulnerabilities and Exposures (CVE) project has assigned the following names to these issues. These are candidates for inclusion in the CVE list (, which standardizes names for security problems. CVE-2006-0559 -------Symantec Consulting Services Advisory Information------- For questions about this advisory, or to report an error: cs_advisories (at) symantec (dot) com [email concealed] For details on Symantec's Vulnerability Reporting Policy: Symantec Vulnerability Research Advisory Archive: Symantec Vulnerability Research Advisory PGP Key: _PGP.asc -------------Symantec Product Advisory Information------------- To Report a Security Vulnerability in a Symantec Product: secure (at) symantec (dot) com [email concealed] For general information on Symantec's Product Vulnerability reporting and response: Symantec Product Advisory Archive: Symantec Product Advisory PGP Key: sc --------------------------------------------------------------- Copyright (c) 2006 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 Consulting Services. Reprinting the whole or part of this alert in any medium other than electronically requires permission from cs_advisories (at) symantec (dot) com. [email concealed] 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. Symantec, Symantec products, and Symantec Consulting Services 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.

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