full-disclosure - FreeBSD 6.4 pipeclose()/knlist_cleardel() race condition exploit

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Message-ID: <4ACDF731.6090006@freebsd.lublin.pl>
Date: Thu, 08 Oct 2009 16:29:05 +0200
From: Przemyslaw Frasunek <venglin@...ebsd.lublin.pl>
To: full-disclosure@...ts.grok.org.uk, bugtraq@...urityfocus.com
Subject: 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

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