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

From: Przemyslaw Frasunek <venglin@freebsd.lublin.pl>
To: full-disclosure@lists.grok.org.uk,bugtraq@securityfocus.com
Cc:
Subject: FreeBSD 6.4 pipeclose()/knlist_cleardel() race condition exploit
Date:


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

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