22732 : Multiple BSD pf Crafted IP Fragment Ruleset DoS
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Views This Week	Views All Time	Added to OSVDB	Last Modified	Modified (since 2008)	Percent Complete
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Timeline

Disclosure Date
2006-01-25

Keywords

FreeBSD-SA-06:07.pf

Description

Packet Filter (PF) contains a flaw that may allow a remote denial of service. The issue is triggered when a logic bug in the IP fragment cache may result in a packet fragment being inserted twice, violating a kernel invariant. This will result in loss of availability for the platform.

Classification

Location: Remote / Network Access
Attack Type: Denial of Service
Impact: Loss of Availability
Disclosure: OSVDB Verified

Solution

Upgrade to FreeBSD version 5-STABLE or 6-STABLE, or to the RELENG_6_0, RELENG_5_4, or RELENG_5_3 security branch dated after the correction date, as it has been reported to fix this vulnerability. In addition, FreeBSD has released a patch to address this vulnerability.

OpenBSD has released a patch to address this vulnerability.

It is also possible to correct the flaw by implementing the following workaround: Do not use 'scrub fragment crop' or 'scrub fragment drop-ovl' rules on systems running pf.

Products

FreeBSD Project	FreeBSD	5.3
		5.4
		6.0

OpenBSD	OpenBSD	3.7
		3.8

References

Security Tracker: 1015542
Bugtraq ID: 16375
Secunia Advisory ID: 18609
CVE ID: 2006-0381 (see also: NVD)
SCIP VulDB ID: 2013
Keyword: FreeBSD-SA-06:07.pf
Other Advisory URL: ftp://ftp.freebsd.org/pub/FreeBSD/CERT/advisories/FreeBSD-SA-06:07.pf.asc
Vendor Specific Solution URL: ftp://ftp.FreeBSD.org/pub/FreeBSD/CERT/patches/SA-06:07/pf.patch ftp://ftp.FreeBSD.org/pub/FreeBSD/CERT/patches/SA-06:07/pf.patch.asc http://www.openbsd.org/cgi-bin/cvsweb/src/sys/net/pf_norm.c.diff?r1=1.103&r2=1.104
Vendor Specific Advisory URL: ftp://ftp.netbsd.org/pub/NetBSD/security/advisories/NetBSD-SA2006-004.txt.asc
Mail List Post: http://archives.neohapsis.com/archives/bugtraq/2006-01/0401.html

Credit

Daniel Hartmeier - dhartmeiopenbsd.org - OpenBSD
Jakob Schlyter - jakobopenbsd.org - OpenBSD

CVSSv2 Score

CVSSv2 Base Score = 5.0
Source: nvd.nist.gov | Generated: 2006-01-26 | Disagree?

Blogs

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