TUCoPS :: BSD :: bt-21779.htm

TUCoPS :: BSD :: bt-21779.htm
FreeBSD 6.4 pipeclose()/knlist_cleardel() race condition exploit

FreeBSD 6.4 pipeclose()/knlist_cleardel() race condition exploit FreeBSD 6.4 pipeclose()/knlist_cleardel() race condition exploit


FreeBSD 6.4 and below are vulnerable to race condition between pipeclose() and
knlist_cleardel() resulting in NULL pointer dereference. The following code
exploits vulnerability to run code in kernel mode, giving root shell and
escaping from jail.

http://www.frasunek.com/pipe.txt 

The bug was fixed a week ago and official security advisory was issued:

http://security.freebsd.org/advisories/FreeBSD-SA-09:13.pipe.asc 

-- 
* Fido: 2:480/124 ** WWW: http://www.frasunek.com ** NICHDL: PMF9-RIPE * 
* Jabber ID: venglin@czuby.pl ** PGP ID: 2578FCAD ** HAM-RADIO: SQ5JIV *