Check Point Advisories

OpenSSL X509_cmp_time Denial of Service (CVE-2015-1789)

Check Point Reference: CPAI-2015-1158
Date Published: 6 Oct 2015
Severity: Critical
Last Updated: 10 May 2018
Source: OpenSSL
Industry Reference:CVE-2015-1789
Protection Provided by:

Security Gateway
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 exists in OpenSSL. The vulnerability is due to an error in X509_cmp_time() that causes OpenSSL to read beyond the end of a buffer. A remote, unauthenticated attacker can exploit this vulnerability by sending a crafted certificate to a vulnerable OpenSSL client or server application. Successful exploitation will cause the application to terminate, resulting in a denial-of-service condition.

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

  1. In the IPS tab, click Protections and find the OpenSSL X509_cmp_time Denial of Service 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:  OpenSSL X509_cmp_time Denial of Service

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