Check Point Advisories

OpenSSL SSL_get_shared_ciphers Function Off-by-one Buffer Overflow (CVE-2006-3738; CVE-2007-5135)

Check Point Reference: CPAI-2008-014
Date Published: 20 Jan 2008
Severity: High
Last Updated: 1 Feb 2018
Industry Reference:CVE-2006-3738
Protection Provided by:

Security Gateway
R80, R77, R76, R75, R71, R70

Who is Vulnerable?
Vulnerability Description OpenSSL is an open-source implementation of the SSL protocol. The OpenSSL core library provides various utility functions.A buffer overflow vulnerability has been reported in the OpenSSL library. The vulnerability is due to an error in the OpenSSL SSL_get_shared_ciphers function that fails to properly handle specially crafted lists of ciphers. A remote attacker can exploit this issue by specially crafting a list of ciphers and sending it an affected server. Successful exploitation may allow execution of arbitrary code on the target host.

Protection Overview

This protection will detect and block any crafted list of ciphers sent to the affected server.

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 / R71 / R70

  1. In the IPS tab, click Protections and find the OpenSSL SSL_get_shared_ciphers Function Off-by-one Buffer Overflow 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 Protection Violation.
Attack Information:  OpenSSL SSL_get_shared_ciphers Function Off-by-one Buffer Overflow

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