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 --- SUSE LINUX Products GmbH, GF: Jeff Hawn, Jennifer Guild, Felix Imendörffer, HRB 16746 (AG Nürnberg) Maxfeldstraße 5 90409 Nürnberg Germany
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