Check Point Advisories

Linux Kernel nfsd Subsystem Buffer Overflow (CVE-2008-3915)

Check Point Reference: CPAI-2008-341
Date Published: 20 Jul 2010
Severity: Medium
Last Updated: Sunday 29 December, 2013
Source:
Industry Reference:CVE-2008-3915
Protection Provided by:

Security Gateway
R81, R80, R77, R75
Who is Vulnerable?
Vulnerability Description Linux is a popular open-source operating system in which the kernel and other programs related to the operating systems are developed by a group of volunteers. The Linux Kernel supports a great number of features, including networking, file system and graphics protocols and standards. A remote denial of service vulnerability exists in the Linux Kernel. The vulnerability is due to an implementation flaw which may result in a buffer overflow in the NFS subsystem of the Linux Kernel. By sending Access Control List (ACL) NFS requests to a target host, an attacker may exploit this vulnerability to cause kernel panic, leading to a system wide denial of service condition. Exploiting this vulnerability successfully will cause a kernel panic condition on the target system. The kernel will log a panic message on the system console containing debug information pertaining to the panic condition which includes the call trace, register values and so on. The target host must be restarted to resume its functionality.

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 Linux Kernel nfsd Subsystem Buffer Overflow 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:  NFS Protection Violation.
Attack Information:  Linux Kernel nfsd subsystem buffer overflow

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