Check Point Advisories

Exim DKIM DNS Decoding Buffer Overflow (CVE-2012-5671)

Vulnerability
Protection

Check Point Reference:	CPAI-2012-800
Date Published:	4 Nov 2012
Severity:	High
Last Updated:	Thursday 06 December, 2012
Source:
Industry Reference:	CVE-2012-5671
Protection Provided by:	Security Gateway R81, R80, R77, R75
Who is Vulnerable?
Vulnerability Description	A heap buffer overflow vulnerability has been reported in Exim DKIM. The vulnerability is due to a heap buffer overflow while handling certain DKIM DNS records. A remote attacker can exploit this issue by sending a specially crafted request to the target. Successful exploitation would allow an attacker to execute arbitrary code on the target.

Protection Overview

This protection will detect and block the transferring of malicious data to the target client.

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 Exim DKIM DNS Decoding Buffer Overflow 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: DNS Enforcement Violation.
Attack Information: Exim DKIM DNS Decoding Buffer Overflow