Check Point Advisories

OpenSSL Alternative Chains Certificate Forgery (CVE-2015-1793)

Vulnerability
Protection

Check Point Reference:	CPAI-2015-0858
Date Published:	19 Jul 2015
Severity:	High
Last Updated:	Sunday 26 July, 2015
Source:
Industry Reference:	CVE-2015-1793
Protection Provided by:	Security Gateway R81, R80, R77, R75
Who is Vulnerable?	OpenSSL versions 1.0.2c, 1.0.2b, 1.0.1n and 1.0.1o.
Vulnerability Description	A vulnerability has been detected in the way OpenSSL verifies certificate chains. An attacker may leverage this vulnerability to forge a valid certificate, even if its signing certificate is not recognized by a Certificate Authority (CA).

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 OpenSSL Alternative Chains Certificate Forgery 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: OpenSSL Enforcement Violation.
Attack Information: OpenSSL Alternative Chains Certificate Forgery