Check Point Advisories

Linux Kernel UDP UFO Large Packet Denial of Service (CVE-2013-4563)

Check Point Reference: CPAI-2013-3626
Date Published: 22 Dec 2013
Severity: Critical
Last Updated:
Source: CVE-2013-4563
Protection Provided by:

Security Gateway
R75

Who is Vulnerable? Linux Kernel Project Kernel from 3.10-rc5 prior to commit 0e033e04c2678 (mainline)
Vulnerability Description A denial of service vulnerability exists in Linux Kernel with UDP Fragmentation Offload (UFO) enabled.
Vulnerability DetailsThe vulnerability is due to improper handling of UDP packets over IPv6 with a size larger than MTU when the kernel is configured with the TBF qdisc. A remote attacker can exploit this vulnerability by sending a crafted packet to a vulnerable server. Successful exploitation can result in memory corruption which leads to 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 product to the latest update. For information on how to update , go to SBP-2006-05, Protection tab and select the version of your choice.

Security Gateway R75 / R71 / R70

  1. In the IPS tab, click Protections and find the Linux Kernel UDP UFO Large Packet Denial of Service protection using the Search tool and Edit the protection's settings.
  2. Install policy on all modules.

SmartView Tracker will log the following entries:
Attack Name: Application Servers Protection Violation
Attack Information: Linux Kernel UDP UFO Large Packet Denial of Service

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