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Message-ID: <20110727094320.GD16080@suse.de>
Date: Wed, 27 Jul 2011 11:43:20 +0200
From: Sebastian Krahmer <krahmer@...e.de>
To: oss-security@...ts.openwall.com
Subject: Re: CVE request - dhcp clients
Ah ok, so the delivered scripts actually do this. Thanks
for the pointer.
Sebastian
On Wed, Jul 27, 2011 at 11:26:13AM +0200, Tomas Hoger wrote:
> On Wed, 27 Jul 2011 10:57:39 +0200 Sebastian Krahmer wrote:
>
> > Can you point us to the exact version and location in code where
> > the vulnerability is?
>
> I've not previously looked at the code more closely to find the exact
> spot to be fixed. However, I have successfully reproduced the issue
> with busybox 1.15.1 at least, not sure if I looked at any older
> version too. It should be trivial to reproduce by running udhcpc -s
> <script>, where script just dumps whole env. You should see
> server-provided options exported (hostname, domain).
>
> > I remember to have checked udhcpc at that time and neither I found it
> > setting a hostname or parsing the options for a hostname.
>
> Looks like fill_envp is the place:
> http://git.busybox.net/busybox/tree/networking/udhcp/dhcpc.c#n341
>
> The logic was little different in older versions:
> http://git.busybox.net/busybox/tree/networking/udhcp/dhcpc.c?id=9ac5596a#n336
>
> When I talked to upstream, they did see the issue and opened the bug:
> https://bugs.busybox.net/show_bug.cgi?id=3979
>
> --
> Tomas Hoger / Red Hat Security Response Team
--
~ perl self.pl
~ $_='print"\$_=\47$_\47;eval"';eval
~ krahmer@...e.de - SuSE Security Team
---
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