FreeBSD pfs_getextattr() denial of service
|freebsd-pfsgetextattr-dos (63218)||Medium Risk|
FreeBSD is vulnerable to a denial of service, caused by the attempt to unlock a mutex that wasn?t previously locked by the pfs_getextattr() function. A local attacker could exploit this vulnerability to cause a kernel panic or possibly execute arbitrary code on the system.
Denial of Service
Refer to FreeBSD-SA-10:09.pseudofs for patch, upgrade or suggested workaround information. See References.
- FreeBSD-SA-10:09.pseudofs: Spurious mutex unlock.
- BID-44782: FreeBSD Kernel 'pseudofs' Local Memory Overwrite Vulnerability
- CVE-2010-4210: The pfs_getextattr function in FreeBSD 7.x before 7.3-RELEASE and 8.x before 8.0-RC1 unlocks a mutex that was not previously locked, which allows local users to cause a denial of service (kernel panic), overwrite arbitrary memory locations, and possibly execute arbitrary code via vectors related to opening a file on a file system that uses pseudofs.
- OSVDB ID: 68313: FreeBSD pseudofs pfs_getattr() Function NULL Dereference Local Privilege Escalation
- SA42200: FreeBSD pfs_getextattr() Privilege Escalation Vulnerability
- SECTRACK ID: 1024724: FreeBSD pseudofs Mutex Unlocking Error Lets Local Users Gain Elevated Privileges
- FreeBSD FreeBSD 7.0
- FreeBSD FreeBSD 7.1
- FreeBSD FreeBSD 7.2
- FreeBSD FreeBSD 7.3
Nov 10, 2010
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The information within this database may change without notice. Use of this information constitutes acceptance for use in an AS IS condition. There are NO warranties, implied or otherwise, with regard to this information or its use. Any use of this information is at the user's risk. In no event shall IBM be held liable for any damages whatsoever arising out of or in connection with the use or spread of this information.