2009-07-20 FreeBSD 7.2 (pecoff executable) Local Denial of Service Exploit 23 R D Shaun Colley

[Damian Weber]

On Wed, 11 Nov 2009, Eygene Ryabinkin wrote:

> Date: Wed, 11 Nov 2009 22:37:44 +0300
> From: Eygene Ryabinkin <rea-fbsd at codelabs.ru>
> To: Damian Weber <dweber at htw-saarland.de>
> Cc: Bjoern A. Zeeb <bzeeb-lists at lists.zabbadoz.net>,
>     freebsd-security at freebsd.org, wkoszek at freebsd.org,
>     Oliver Pinter <oliver.pntr at gmail.com>
> Subject: Re: 2009-07-20 FreeBSD 7.2 (pecoff executable) Local Denial of
>     Service  Exploit 23 R D Shaun Colley
> 
> Wed, Nov 11, 2009 at 07:14:48PM +0100, Damian Weber wrote:
> > FWIW, I got another result on 6.4-STABLE
> > 
> > FreeBSD mymachine.local 6.4-STABLE FreeBSD 6.4-STABLE #6: Sat Oct  3 13:06:12 CEST 2009     root at hypercrypt.local:/usr/obj/usr/src/sys/MYMACHINE  i386
> > 
> > $ ./pecoff
> > MZaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa????aaaa
> > [I'm truncating here, ~3500 a's follow]aaaaa: File name too long
> 
> You have no pecoff module loaded or compiled-in to the kernel,
> aren't you?  Your "File name too long" is spitted by the shell,
> so it was not handled by the PE loader at all.

Confirmed. The code crashes the 6.4-stable machine when pecoff module 
is loaded.

Wojciech A. Koszek wrote:
> I think the best way would be to remove PECOFF from 6.x and 7.x.
Now, I'm inclined to think that, too ;-)

-- Damian