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Date: Wed, 01 Oct 2014 14:27:54 -0400
From: Chet Ramey <chet.ramey@...e.edu>
To: Hanno Böck <hanno@...eck.de>,
oss-security@...ts.openwall.com
CC: chet.ramey@...e.edu
Subject: Re: more bash parser bugs (CVE-2014-6277, CVE-2014-6278)
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On 10/1/14, 2:20 PM, Hanno Böck wrote:
> Haven't seen it here yet. lcamtuf now disclosed details of the two
> further parser bugs he found:
> http://lcamtuf.blogspot.de/2014/10/bash-bug-how-we-finally-cracked.html
>
> Basically if anyone hasn't applied one of the prefix patches yet now's
> the time to do so.
>
> While prefixing should shield against them they should still be fixed
> for good.
>
> CVE-2014-6277 can still be triggered to segfault a fully patched bash:
> bash -c "f(){ x(){ _;}; x(){ _;}<<a;}"
>
> Second issue PoC on fully patched system:
> env BASH_FUNC_x%%='() { _;}>_[$($())] { echo vuln;}' bash -c :
>
> (both likely not exploitable due to prefix shielding, but should be
> fixed anyway)
I have patches for these, and they are in the pipeline.
Chet
- --
``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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