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Date: Wed, 12 Oct 2011 11:58:23 +0400
From: Vasiliy Kulikov <segoon@...nwall.com>
To: Reuben Hawkins <reubenhwk@...il.com>
Cc: oss-security@...ts.openwall.com
Subject: Re: radvd 1.8.2 released with security fixes
On Tue, Oct 11, 2011 at 23:26 -0700, Reuben Hawkins wrote:
> On Sat, Oct 8, 2011 at 9:55 AM, Vasiliy Kulikov <segoon@...nwall.com> wrote:
> > 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
> >
>
> Are y'all waiting on me to release 1.8.3 with the latest fix?
If nobody has any complains about the fix, I think it's the right
thing to do - the bug greatly weakens the role of privsep. It's a good
reason for the release.
Thanks,
--
Vasiliy Kulikov
http://www.openwall.com - bringing security into open computing environments
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