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Date: Thu, 25 Sep 2014 15:41:57 -0400
From: Chet Ramey <chet.ramey@...e.edu>
To: Tavis Ormandy <taviso@...gle.com>, oss-security@...ts.openwall.com
CC: chet.ramey@...e.edu, Solar Designer <solar@...nwall.com>
Subject: Re: CVE-2014-6271: remote code execution through bash
On 9/25/14, 3:39 PM, Tavis Ormandy wrote:
> On Thu, Sep 25, 2014 at 12:18 PM, Chet Ramey <chet.ramey@...e.edu> wrote:
>> On 9/25/14, 12:15 PM, Solar Designer wrote:
>>
>>> What do you think of distros' going with Florian's prefix-suffix patch
>>> right now? I think it breaks function imports/exports between
>>> pre-patch and post-patch bash versions, but keeps them intact for
>>> patched versions. Right? If so, this sounds acceptable for immediate
>>> use by distros. Do you agree?
>>
>> I haven't looked at that particular patch in detail yet, but I am wondering
>> why adding both a prefix and a suffix is better than just adding a prefix.
>>
>
> I think it's just paranoia, it demonstrates significant enough control
> over the environment that it's unlikely someone could construct it via
> a naive cgi environment or similar. If someone can create variables
> with an arbitrary suffix and prefix, then there are likely bigger
> problems to worry about than what bash is doing. FWIW, I like
> Florian's approach.
Yeah, that general approach is probably the best. I was just wondering.
I don't really see the need to use a prefix and a suffix, though.
--
``The lyf so short, the craft so long to lerne.'' - Chaucer
``Ars longa, vita brevis'' - Hippocrates
Chet Ramey, ITS, CWRU chet@...e.edu http://cnswww.cns.cwru.edu/~chet/
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