22732 : Multiple BSD pf Crafted IP Fragment Ruleset DoS
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Info

Last Modified
about 1 year ago

Percent Complete
100%

Disclosure
Jan 25, 2006

Discovery
Unknown

Dates

Exploit
Unknown

Solution
Unknown

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 Required
Attack Type: Denial of Service
Impact: Loss of Availability
Exploit: Exploit Unavailable
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
Watch-list
FreeBSD
Watch-list
 5.3
5.4
6.0
OpenBSD
Watch-list
OpenBSD
Watch-list
 3.7
3.8

References

Credit
  • Daniel Hartmeier - dhartmeiBrand New Doo Dooopenbsd.org - OpenBSD
  • Jakob Schlyter - jakobBrand New Doo Dooopenbsd.org - OpenBSD

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