Check Point Advisories

OpenSSL DHE and ECDHE Parameters NULL Pointer Dereference (CVE-2017-3730)

Vulnerability
Protection

Check Point Reference:	CPAI-2017-0153
Date Published:	28 Feb 2017
Severity:	Medium
Last Updated:	Thursday 25 May, 2017
Source:	OpenSSL
Industry Reference:	CVE-2017-3730
Protection Provided by:	Security Gateway R81, R80, R77, R75
Who is Vulnerable?	OpenSSL Project OpenSSL 1.1.x prior to 1.1.0d
Vulnerability Description	A NULL pointer dereference vulnerability exists in OpenSSL. This vulnerability is due to the way crafted DHE and ECDHE parameters are handled by an OpenSSL client application during TLS handshake. A remote attacker could exploit this vulnerability in an OpenSSL client application, by sending crafted DHE or ECDHE parameters during TLS handshake.

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 DHE and ECDHE Parameters NULL Pointer Dereference 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 DHE and ECDHE Parameters NULL Pointer Dereference