Lucene search

K
securityvulnsSecurityvulnsSECURITYVULNS:DOC:11182
HistoryJan 25, 2006 - 12:00 a.m.

[SA18609] FreeBSD "pf" IP Fragment Denial of Service Vulnerability

2006-01-2500:00:00
vulners.com
7

TITLE:
FreeBSD "pf" IP Fragment Denial of Service Vulnerability

SECUNIA ADVISORY ID:
SA18609

VERIFY ADVISORY:
http://secunia.com/advisories/18609/

CRITICAL:
Moderately critical

IMPACT:
DoS

WHERE:
>From remote

OPERATING SYSTEM:
FreeBSD 6.x
http://secunia.com/product/6778/
FreeBSD 5.x
http://secunia.com/product/1132/

DESCRIPTION:
A vulnerability has been reported in FreeBSD, which can be exploited
by malicious people to cause a DoS (Denial of Service).

The vulnerability is caused due to an error in the "pf" Internet
Protocol packet-filter fragment cache when handling IP fragments.
This can be exploited to crash the system by sending a
specially-crafted sequence of IP packet fragments to the packet
filter.

Successful exploitation requires that "pf" is used with a ruleset
containing "scrub fragment crop" or "scrub fragment drop-ovl" rules.

The vulnerability has been reported in version 5.3, 5.4, and 6.0.

SOLUTION:
Update FreeBSD or apply patch.

Fixed versions:
2006-01-25 10:00:59 UTC (RELENG_6, 6.0-STABLE)
2006-01-25 10:01:26 UTC (RELENG_6_0, 6.0-RELEASE-p4)
2006-01-25 10:01:47 UTC (RELENG_5, 5.4-STABLE)
2006-01-25 10:02:07 UTC (RELENG_5_4, 5.4-RELEASE-p10)
2006-01-25 10:02:27 UTC (RELENG_5_3, 5.3-RELEASE-p25)

Patch for FreeBSD 5.3, 5.4, and 6.0:
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

PROVIDED AND/OR DISCOVERED BY:
The vendor credits Jakob Schlyter and Daniel Hartmeier.

ORIGINAL ADVISORY:
ftp://ftp.freebsd.org/pub/FreeBSD/CERT/advisories/FreeBSD-SA-06:07.pf.asc


About:
This Advisory was delivered by Secunia as a free service to help
everybody keeping their systems up to date against the latest
vulnerabilities.

Subscribe:
http://secunia.com/secunia_security_advisories/

Definitions: (Criticality, Where etc.)
http://secunia.com/about_secunia_advisories/

Please Note:
Secunia recommends that you verify all advisories you receive by
clicking the link.
Secunia NEVER sends attached files with advisories.
Secunia does not advise people to install third party patches, only
use those supplied by the vendor.