Secunia Security Advisory - A vulnerability has been reported in FreeBSD, which can be exploited by malicious, local users to cause a DoS (Denial of Service) and potentially gain escalated privileges.
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TITLE:
FreeBSD Devfs / VFS NULL Pointer Dereference Privilege Escalation
SECUNIA ADVISORY ID:
SA36945
VERIFY ADVISORY:
http://secunia.com/advisories/36945/
DESCRIPTION:
A vulnerability has been reported in FreeBSD, which can be exploited
by malicious, local users to cause a DoS (Denial of Service) and
potentially gain escalated privileges.
The vulnerability is caused due to a NULL pointer dereference error
caused by a race condition within the devfs and VFS interaction. This
can be exploited to e.g. execute arbitrary code with kernel
privileges.
NOTE: Additionally, the vendor provides an enhancement against NULL
pointer exploits.
SOLUTION:
Update FreeBSD or apply patches.
Fixed versions:
2009-05-18 10:41:59 UTC (RELENG_7, 7.2-STABLE)
2009-10-02 18:09:56 UTC (RELENG_7_2, 7.2-RELEASE-p4)
2009-10-02 18:09:56 UTC (RELENG_7_1, 7.1-RELEASE-p8)
Patches:
http://security.FreeBSD.org/patches/SA-09:14/devfs7.patch.asc
PROVIDED AND/OR DISCOVERED BY:
The vendor credits Przemyslaw Frasunek.
ORIGINAL ADVISORY:
http://security.freebsd.org/advisories/FreeBSD-SA-09:14.devfs.asc
http://security.freebsd.org/advisories/FreeBSD-EN-09:05.null.asc
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