Date: Wed, 27 Jul 2011 11:26:13 +0200 From: Tomas Hoger <thoger@...hat.com> To: oss-security@...ts.openwall.com Subject: Re: CVE request - dhcp clients 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
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