Check Point Advisories

GnuTLS Proxy Certificate Information Extension Memory Corruption (CVE-2017-5334)

Check Point Reference: CPAI-2017-0325
Date Published: 24 Apr 2017
Severity: High
Last Updated: Monday 29 May, 2017
Source: GnuTLS GNUTLS-SA-2017-1
Industry Reference:CVE-2017-5334
Protection Provided by:

Security Gateway
R81, R80, R77, R75
Who is Vulnerable? GnuTLS GnuTLS 3.3.x prior to 3.3.26
GnuTLS GnuTLS 3.5.x prior to 3.5.8
Vulnerability Description A memory corruption vulnerability has been reported in the GnuTLS library. The vulnerability is due to improper handling of the Proxy Certificate Information extension in X.509 certificates. A remote attacker can exploit this vulnerability in GnuTLS by sending a crafted X.509 certificate to a target application. Successful exploitation could result in arbitrary code execution in the context of the target application.

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

  1. In the IPS tab, click Protections and find the GnuTLS Proxy Certificate Information Extension Memory Corruption 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:  SSL Enforcement Violation.
Attack Information:  GnuTLS Proxy Certificate Information Extension Memory Corruption

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