Check Point Advisories

TLS Invalid Cipher Suites Denial of Service

Vulnerability
Protection

Check Point Reference:	CPAI-2014-1493
Date Published:	30 Apr 2014
Severity:	Critical
Last Updated:	Tuesday 12 April, 2016
Source:
Protection Provided by:	Security Gateway R81, R80, R77, R75
Who is Vulnerable?	TLS 1.1 TLS 1.2
Vulnerability Description	A denial of service vulnerability has been reported in servers using TLS protocol. The vulnerability is due to the server's inability to handle Invalid TLS cipher suites. Remote attackers can exploit this issue by sending specially crafted cipher suites to an affected server.

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 TLS Invalid Cipher Suites Denial of Service 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: TLS Invalid Cipher Suites Denial of Service