[SA18353] FreeBSD IEEE 802.11 Buffer Overflow Vulnerability

TITLE:
FreeBSD IEEE 802.11 Buffer Overflow Vulnerability

SECUNIA ADVISORY ID:
SA18353

VERIFY ADVISORY:
http://secunia.com/advisories/18353/

CRITICAL:
Moderately critical

IMPACT:
System access

WHERE:
>From remote

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

DESCRIPTION:
Karl Janmar has reported a vulnerability in FreeBSD, which
potentially can be exploited by malicious people to compromise a
vulnerable system.

The vulnerability is caused due to an integer overflow error in the
"net80211" module when handling corrupt IEEE 802.11 beacons or probe
response frames during scanning for existing wireless networks. This
can result in a buffer overflow and may allow execution of arbitrary
code on a vulnerable system scanning for wireless networks.

SOLUTION:
Update FreeBSD or apply patch.

Fixed versions:
2006-01-18 09:03:15 UTC (RELENG_6, 6.0-STABLE)
2006-01-18 09:03:36 UTC (RELENG_6_0, 6.0-RELEASE-p3)

Patch for FreeBSD 6.0:
ftp://ftp.FreeBSD.org/pub/FreeBSD/CERT/patches/SA-06:05/80211.patch
ftp://ftp.FreeBSD.org/pub/FreeBSD/CERT/patches/SA-06:05/80211.patch.asc

PROVIDED AND/OR DISCOVERED BY:
Karl Janmar

ORIGINAL ADVISORY:
FreeBSD:
ftp://ftp.freebsd.org/pub/FreeBSD/CERT/advisories/FreeBSD-SA-06:05.80211.asc

Karl Janmar:
http://www.signedness.org/advisories/sps-0x1.txt

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