Secunia Security Advisory - Some vulnerabilities have 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 Privilege Escalation Vulnerabilities
SECUNIA ADVISORY ID:
SA36955
VERIFY ADVISORY:
http://secunia.com/advisories/36955/
DESCRIPTION:
Some vulnerabilities have been reported in FreeBSD, which can be
exploited by malicious, local users to cause a DoS (Denial of
Service) and potentially gain escalated privileges.
1) A use-after-free error caused by a race condition within the pipe
"close()" implementation related to kqueues can be exploited to e.g.
execute arbitrary code with kernel privileges.
2) A NULL pointer dereference error can be exploited to e.g. execute
arbitrary code with kernel privileges.
For more information:
SA36945
NOTE: Additionally, the vendor provides an enhancement against NULL
pointer exploits.
SOLUTION:
Update FreeBSD or apply patches.
2009-10-02 18:09:56 UTC (RELENG_6, 6.4-STABLE)
2009-10-02 18:09:56 UTC (RELENG_6_4, 6.4-RELEASE-p7)
2009-10-02 18:09:56 UTC (RELENG_6_3, 6.3-RELEASE-p13)
Patches:
1) http://security.FreeBSD.org/patches/SA-09:13/pipe.patch.asc
2) http://security.FreeBSD.org/patches/SA-09:14/devfs6.patch.asc
PROVIDED AND/OR DISCOVERED BY:
The vendor credits Przemyslaw Frasunek.
ORIGINAL ADVISORY:
1) http://security.freebsd.org/advisories/FreeBSD-SA-09:13.pipe.asc
2) http://security.freebsd.org/advisories/FreeBSD-SA-09:14.devfs.asc
http://security.freebsd.org/advisories/FreeBSD-EN-09:05.null.asc
OTHER REFERENCES:
SA36945:
http://secunia.com/advisories/36945/
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