Check Point Advisories

OpenSSL X.509 IPAddressFamily Extension Parsing Out-of-Bounds Read (CVE-2017-3735)

Vulnerability
Protection

Check Point Reference:	CPAI-2017-0740
Date Published:	6 Sep 2017
Severity:	Medium
Last Updated:	Thursday 28 September, 2017
Source:	OpenSSL
Industry Reference:	CVE-2017-3735
Protection Provided by:	Security Gateway R81, R80, R77, R75
Who is Vulnerable?	OpenSSL Project OpenSSL prior to 1.0.2l-git OpenSSL Project OpenSSL prior to 1.1.0f-git
Vulnerability Description	An out-of-bounds read vulnerability exists in OpenSSL. The vulnerability is due to improper handling of malformed IPAddressFamily extensions within X.509 certificates. A remote attacker could exploit this vulnerability by sending a crafted certificate to a vulnerable server.

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 OpenSSL X.509 IPAddressFamily Extension Parsing Out-of-Bounds Read 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 X.509 IPAddressFamily Extension Parsing Out-of-Bounds Read