Check Point Advisories

Linux Kernel IPv6 over IPv4 Memory Leak Denial of Service (CVE-2008-2136)

Check Point Reference: CPAI-2008-073
Date Published: 22 May 2008
Severity: Medium
Last Updated: Thursday 29 May, 2008
Industry Reference:CVE-2008-2136
Protection Provided by:

Security Gateway
R81, R80, R77, R75, R71, R70, R65

Who is Vulnerable?
Vulnerability Description Linux is a popular open-source operating system that supports the IPv4 and IPv6 network protocols. IPv6 over IPv4 tunneling is a technique that encapsulates IPv6 packets within IPv4 headers to transit them over IPv4 routing infrastructures. A denial of service vulnerability has been reported in the Linux Kernel. The vulnerability is due to an error in the Linux Kernel IPv6 over IPv4 tunneling driver that fails to properly handle crafted network packets. In order to exploit this issue, an attacker can send a specially crafted packet to a vulnerable host. Successful exploitation may allow the attacker to create a denial of service condition.

Protection Overview

This protection will detect and block malformed IPv6 packets sent to the vulnerable host.

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 / R71 / R70 / R65

  1. In the IPS tab, click Protections and find the Linux Kernel IPv6 over IPv4 Memory Leak 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:  ICMP Protocol Violation.
Attack Information:  Linux Kernel IPv6 over IPv4 memory leak denial of service

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