Symantec Vulnerability Research
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 : http://www.securityfocus.com/bid/16742
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.
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.
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.
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 (http://cve.mitre.org), which standardizes
names for security problems.
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