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Message-ID: <CABniQZNf+kZcaXGkq8tvEGjCSsCEn=V=RwdiFyPBcDJoy1GN6Q@mail.gmail.com>
Date: Thu, 2 Oct 2014 05:04:16 +0800
From: Shawn <citypw@...il.com>
To: oss-security@...ts.openwall.com
Cc: Chet Ramey <chet.ramey@...e.edu>
Subject: Re: more bash parser bugs (CVE-2014-6277, CVE-2014-6278)
http://ftp.gnu.org/gnu/bash/bash-4.3-patches/bash43-028
On Thu, Oct 2, 2014 at 2:20 AM, Hanno Böck <hanno@...eck.de> 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)
>
> --
> Hanno Böck
> http://hboeck.de/
>
> mail/jabber: hanno@...eck.de
> GPG: BBB51E42
--
GNU powered it...
GPL protect it...
God blessing it...
regards
Shawn
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