Check Point Advisories

OpenSSL Elliptic Curve Binary Polynomial Field Resource Exhaustion (CVE-2015-1788)

Vulnerability
Protection

Check Point Reference:	CPAI-2015-0994
Date Published:	17 Aug 2015
Severity:	Critical
Last Updated:	Wednesday 19 August, 2015
Source:	OpenSSL0150611.txt secadv_20150611.txt
Industry Reference:	CVE-2015-1788
Protection Provided by:	Security Gateway R81, R80, R77, R75
Who is Vulnerable?	OpenSSL Project OpenSSL prior to 0.9.8zg OpenSSL Project OpenSSL prior to 1.0.0s OpenSSL Project OpenSSL prior to 1.0.1n OpenSSL Project OpenSSL prior to 1.0.2b
Vulnerability Description	A denial of service vulnerability has been reported in OpenSSL. The vulnerability is due to a missing validity check of Elliptic Curve parameters within BN_GF2m_mod_inv(). A remote attacker can exploit this vulnerability by sending a crafted certificate to a vulnerable OpenSSL client or server application.

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 Elliptic Curve Binary Polynomial Field Resource Exhaustion 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 Elliptic Curve Binary Polynomial Field Resource Exhaustion