Check Point Advisories

Mozilla Network Security Services SSLv2 client integer underflow (CVE-2007-0008)

Check Point Reference: CPAI-2007-239
Date Published: 16 Feb 2010
Severity: Medium
Last Updated: Tuesday 16 February, 2010
Source:
Industry Reference:CVE-2007-0008
Protection Provided by:

Security Gateway
R81, R80, R77, R75
Who is Vulnerable?
Vulnerability Description Mozilla Network Security Services (NSS) is a set of libraries designed to support cross-platform development of security-enabled client and server applications. NSS provides a support for Secure Sockets Layer (SSL), Secure / Multipurpose Internet Mail Extensions (S/MIME) and other security standards. There exists a heap-based buffer overflow vulnerability in Mozilla Network Security Services (NSS). The vulnerability is due to a design error in the processing of malformed SSLv2 server messages. Successful exploitation of this vulnerability allows remote attackers to execute arbitrary code on the vulnerable system in the context of the affected application. Upon an attack where code execution is unsuccessful, the affected browser will terminate. The behaviour of the host system after an attack attempt resulting in arbitrary code injection and its subsequent execution is dependent on the intention of the injected code. The injected code will be executed in the security context of the currently logged in user.

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

  1. In the IPS tab, click Protections and find the Mozilla Network Security Services SSLv2 client integer underflow protection using the Search tool and Edit the protection's settings.
  2. Install policy on all Security Gateways.

This protection's log will contain the following information:

Attack Name:  Web Client Enforcement Violation.
Attack Information:  Mozilla Network Security Services SSLv2 client integer underflow

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