Check Point Advisories

Multiple Vendors TLS Certificate Common Name NULL Byte Input Validation Error (CVE-2015-3008; CVE-2015-3455)

Vulnerability
Protection

Check Point Reference:	CPAI-2015-0589
Date Published:	21 May 2015
Severity:	High
Last Updated:	Wednesday 25 May, 2016
Source:	Asterisk Squid Project AST-2015-003 Squid Project
Industry Reference:	CVE-2015-3008 CVE-2015-3455
Protection Provided by:	Security Gateway R81, R80, R77, R75
Who is Vulnerable?	Asterisk Asterisk Open Source prior to 1.8.32.3 Asterisk Asterisk Open Source prior to 11.17.1 Asterisk Asterisk Open Source prior to 12.8.2 Asterisk Asterisk Open Source prior to 13.3.2 Asterisk Certified Asterisk prior to 1.8.28-cert5 Asterisk Certified Asterisk prior to 11.6-cert11 Asterisk Certified Asterisk prior to 13.1-cert2 Squid Project Squid prior to 3.2.14 Squid Project Squid prior to 3.3.14 Squid Project Squid prior to 3.4.13 Squid Project Squid prior to 3.5.4
Vulnerability Description	A policy bypass vulnerability exists in multiple products. The vulnerability is due to incorrectly validating the common name in a certificate. It can be exploited by using a NULL character after the portion of the common name that the product expects. By exploiting this vulnerability, a remote attacker can conduct a variety of attacks including man-in-the-middle.

Protection Overview

This protection detects 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 Multiple Vendors TLS Certificate Common Name NULL Byte Input Validation Error 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: SSL Enforcement Violation.
Attack Information: Multiple Vendors TLS Certificate Common Name NULL Byte Input Validation Error