Rule: -- Sid: 2594 -- Summary: This event is generated when an attempt is made to exploit a buffer overflow associated with the Mail Transfer Agent Exim. -- Impact: A successful attack may allow the execution of arbitrary code on a vulnerable server with the privilege of the process running Exim. -- Detailed Information: Exim is vulnerable to a buffer overflow, permitting an attacker to execute arbitrary code. The vulnerability may be exploited if Exim is configured to verify header syntax in the e-mail message body. This is not the default configuration. If an attacker supplies a large number of spaces after certain header fields, it may be possible to cause a buffer overflow. -- Affected Systems: Exim prior to version 4.34 -- Attack Scenarios: An attacker can create and send mail with a malformed header, possibly causing a buffer overflow and permitting the execution of arbitrary code. -- Ease of Attack: Simple. -- False Positives: None known. -- False Negatives: None known. -- Corrective Action: Upgrade to the latest non-affected version of the software. -- Contributors: Sourcefire Research Team Judy Novak <judy.novak@sourcefire.com> -- Additional References Bugtraq: http://www.securityfocus.com/bid/10291 CVE: http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2004-0400 Other: http://www.guninski.com/exim1.html --
