Check Point Advisories

Postfix IPv6 Relaying of Mail Messages Security Issue (CVE-2005-0337)

Vulnerability
Protection

Check Point Reference:	CPAI-2012-1330
Date Published:	12 Feb 2013
Severity:	Medium
Last Updated:	Thursday 12 March, 2015
Source:
Industry Reference:	CVE-2005-0337
Protection Provided by:	Security Gateway R81, R80, R77, R75
Who is Vulnerable?
Vulnerability Description	A vulnerability has been reported in the way Postfix handles the relaying of email messages. A vulnerable Postfix can become an open relay for mail addressed to MX host with IPv6 addresses. An attacker can exploit this flaw to deliver bulk arbitrary mail, using 3rd party resources, to a mail gateway with IPv6 addresses registered. A successful attack allows an attacker to use the target Postfix as an open relay to MX hosts with IPv6 addresses. The target will relay mail from an untrusted SMTP client.

Protection Overview

This protection will detect and block attempts to exploit this vulnerability

In order for the protection to be activated, update your Security Gateway product to the latest IPS update. For information on how to update IPS, go to SBP-2006-05, click on Protection tab and select the version of your choice.

Security Gateway R80 / R77 / R75

In the IPS tab, click Protections and find the Postfix IPv6 Relaying of Mail Messages Security Issue protection using the Search tool and Edit the protection's settings.
Install policy on all Security Gateways.

This protection's log will contain the following information:

Attack Name: SMTP Protection Violation.
Attack Information: Postfix IPv6 relaying of mail messages security issue