Check Point Advisories

SSL NULL Termination Certificate Validation Security Bypass (CVE-2009-2408; CVE-2009-2510; CVE-2009-4565)

Vulnerability
Protection

Check Point Reference:	CPAI-2009-129
Date Published:	12 Aug 2009
Severity:	Critical
Last Updated:	Tuesday 07 May, 2013
Source:
Industry Reference:	CVE-2009-2408 CVE-2009-2510 CVE-2009-4565
Protection Provided by:	Security Gateway R81, R80, R77, R75, R71, R70, R65
Who is Vulnerable?
Vulnerability Description	Network Security Services (NSS) is a set of libraries designed to support cross-platform development of security-enabled client and server applications. Firefox is a popular, open source web browser developed by Mozilla Foundation. A security bypass vulnerability has been reported in Mozilla Network Security Services (NSS) and Firefox. The vulnerability is due to an error in Mozilla Firefox and NSS when handling NULL characters in a domain name in the subject's Common Name (CN) field of a certificate. A remote attacker can exploit this flaw by sending a malicious certificate to a vulnerable system. Successful exploitation could allow man-in-the-middle attackers to spoof arbitrary SSL servers via a crafted certificate issued by a legitimate Certification Authority.

Protection Overview

This protection will detect and block NULL prefix found in SSL certificates.

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 / R71 / R70 / R65

In the IPS tab, click Protections and find the SSL NULL Termination Certificate Validation Security Bypass 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: Web Client Enforcement Violation.
Attack Information: SSL NULL termination certificate validation security bypass