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Date: Sat, 8 Oct 2011 20:55:04 +0400
From: Vasiliy Kulikov <segoon@...nwall.com>
To: oss-security@...ts.openwall.com
Cc: Reuben Hawkins <reubenhwk@...il.com>
Subject: Re: radvd 1.8.2 released with security fixes
On Fri, Oct 07, 2011 at 15:41 +0100, John Haxby wrote:
> On 07/10/11 14:03, Robert Święcki wrote:
> > On Fri, Oct 7, 2011 at 12:35 PM, Huzaifa Sidhpurwala
> > <huzaifas@...hat.com> wrote:
> >> Shouldnt this be:
> >>
> >> /* No path traversal */
> >> if (strstr(iface, "..") || strchr(iface, '/'))
> >> return -1;
> > FWIW, this will reject too much;
> >
> > /path/to/sth..jpg
> >
>
> Indeed, since I don't believe that iface can reasonably include a "/"
> its sufficient to check for that. If not then you need to check for
> "../" at the beginning of iface and "/.." anywhere else in it. But
> simply forbidding "/" should be fine.
Crap, thank you for noticing it, guys. The fix should be:
https://github.com/reubenhwk/radvd/commit/7a1471b62da88373e8f4209d503307c5d841b81f
Now, "", "..", "." and filenames with "/" inside are denied.
Thanks,
--
Vasiliy Kulikov
http://www.openwall.com - bringing security into open computing environments
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