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FreeBSD Security Advisory FreeBSD-SA-08:04.ipsec

From: FreeBSD Security Advisories <security-advisories_at_nospam>
Date: Thu Feb 14 2008 - 12:11:31 GMT
To: FreeBSD Security Advisories <security-advisories@FreeBSD.org>


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FreeBSD-SA-08:04.ipsec Security Advisory The FreeBSD Project Topic: IPsec null pointer dereference panic Category: core Module: ipsec Announced: 2008-02-14 Credits: Takashi Sogabe, Tatuya Jinmei Affects: FreeBSD 5.5 Corrected: 2008-02-14 11:49:39 UTC (RELENG_5, 5.5-STABLE) 2008-02-14 11:50:28 UTC (RELENG_5_5, 5.5-RELEASE-p19) CVE Name: CVE-2008-0177

For general information regarding FreeBSD Security Advisories, including descriptions of the fields above, security branches, and the following sections, please visit <URL:http://security.FreeBSD.org/>.

I. Background

The IPsec suite of protocols provide network level security for IPv4 and IPv6 packets. FreeBSD includes software originally developed by the KAME project which implements the various protocols that make up IPsec.

II. Problem Description

There is an improper reference to a data structure in the processing of IPsec packets, which can result in a NULL pointer being dereferenced.

III. Impact

A single specifically crafted IPv6 packet could cause the kernel to panic, when the kernel had been configured to process IPsec and IPv6 traffic.

This requires IPSEC to be compiled into the kernel, it does not necessarily have to be configured at that point.

IV. Workaround

No workaround is available, but kernels which does not include IPsec support are not vulnerable. The GENERIC and SMP kernel configurations distributed with FreeBSD releases do not include IPsec support.

V. Solution

Perform one of the following:

  1. Upgrade your vulnerable system to 5-STABLE, or to the RELENG_5_5 security branch dated after the correction date.
  2. To patch your present system:

The following patches have been verified to apply to FreeBSD 5.5 systems.

  1. Download the relevant patch from the location below, and verify the detached PGP signature using your PGP utility.

# fetch http://security.FreeBSD.org/patches/SA-08:04/ipsec.patch
# fetch http://security.FreeBSD.org/patches/SA-08:04/ipsec.patch.asc

b) Apply the patch.

# cd /usr/src
# patch < /path/to/patch

c) Recompile your kernel as described in <URL:http://www.FreeBSD.org/handbook/kernelconfig.html> and reboot the system.

VI. Correction details

The following list contains the revision numbers of each file that was corrected in FreeBSD. Branch Revision   Path - ------------------------------------------------------------------------- RELENG_5 src/sys/netinet6/ipcomp_input.c 1.7.4.2 RELENG_5_5 src/UPDATING 1.342.2.35.2.20 src/sys/conf/newvers.sh 1.62.2.21.2.21 src/sys/netinet6/ipcomp_input.c 1.7.4.1.4.1 - -------------------------------------------------------------------------

VII. References

http://www.kb.cert.org/vuls/id/110947
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2008-0177

The latest revision of this advisory is available at http://security.FreeBSD.org/advisories/FreeBSD-SA-08:04.ipsec.asc -----BEGIN PGP SIGNATURE-----
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