Check Point Advisories

OpenSSL TLS Protocol Downgrade Attack (CVE-2014-3511)

Vulnerability
Protection

Check Point Reference:	CPAI-2014-1991
Date Published:	10 Nov 2014
Severity:	Medium
Last Updated:	Sunday 03 December, 2017
Source:	Secunia
Industry Reference:	CVE-2014-3511
Protection Provided by:	Security Gateway R81, R80, R77, R75
Who is Vulnerable?	openssl:openssl:1.0.1h openssl:openssl:1.0.1 openssl:openssl:1.0.1:beta1 openssl:openssl:1.0.1:beta2 openssl:openssl:1.0.1:beta3 openssl:openssl:1.0.1a openssl:openssl:1.0.1b openssl:openssl:1.0.1c openssl:openssl:1.0.1d openssl:openssl:1.0.1e openssl:openssl:1.0.1f openssl:openssl:1.0.1g openssl:openssl:1.0.0 openssl:openssl:1.0.0:beta1 openssl:openssl:1.0.0:beta2 openssl:openssl:1.0.0:beta3 openssl:openssl:1.0.0:beta4 openssl:openssl:1.0.0:beta5 openssl:openssl:1.0.0a openssl:openssl:1.0.0b openssl:openssl:1.0.0c openssl:openssl:1.0.0d openssl:openssl:1.0.0e openssl:openssl:1.0.0f openssl:openssl:1.0.0g openssl:openssl:1.0.0h openssl:openssl:1.0.0i openssl:openssl:1.0.0j openssl:openssl:1.0.0k openssl:openssl:1.0.0l openssl:openssl:1.0.0m
Vulnerability Description	OpenSSL allows man-in-the-middle attackers to force the use of TLS 1.0 by triggering ClientHello message fragmentation in communication between a client and server, even though both client and server support later TLS versions.

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 TLS Protocol Downgrade Attack 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: OpenSSL TLS Protocol Downgrade Attack