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Date: Fri, 07 Oct 2011 15:41:23 +0100
From: John Haxby <john.haxby@...cle.com>
To: oss-security@...ts.openwall.com
Subject: Re: radvd 1.8.2 released with security fixes
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.
jch
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