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Check Point Advisories

OpenSSL SSL_peek Infinite Loop Denial of Service (CVE-2016-6305)

Check Point Reference: CPAI-2016-0970
Date Published: 1 Nov 2016
Severity: Medium
Last Updated: 22 Apr 2018
Source: OpenSSL
Industry Reference:CVE-2016-6305
Protection Provided by:

Security Gateway
R80, R77, R76, R75

Who is Vulnerable? OpenSSL Project OpenSSL 1.1.0
Vulnerability Description A denial-of-service vulnerability exists in OpenSSL. The vulnerability is due to an error in SSL_peek() API that causes an infinite loop to occur when processing empty records. A remote, unauthenticated attacker can exploit this vulnerability by supplying an empty record during an SSL connection. Successful exploitation will cause the server application to use up 100% of its CPU resources, 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 / R76 / R75

  1. In the IPS tab, click Protections and find the OpenSSL SSL_peek Infinite Loop Denial of Service protection using the Search tool and Edit the protection's settings.
  2. Install policy on all modules.

This protection's log will contain the following information:

Attack Name:  OpenSSL Enforcement Violation.
Attack Information:  OpenSSL SSL_peek Infinite Loop Denial of Service

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