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Message-ID: <CABJ8ys96+Ksmg5moqacpbLdfnQOL1+XWCjpSvyFxr=99N8PuGg@mail.gmail.com>
Date: Mon, 29 Sep 2014 22:58:12 +0800
From: Osmond Sun <osmond.sun@...il.com>
To: Chester Ramey <chet.ramey@...e.edu>
Cc: oss-security@...ts.openwall.com
Subject: Re: Re: CVE-2014-6271: remote code execution through
bash (3rd vulnerability)
I see, Thanks
Osmond
2014-09-29 22:33 GMT+08:00 Chet Ramey <chet.ramey@...e.edu>:
> On 9/29/14, 9:01 AM, Osmond Sun wrote:
>> I found the function parsing is still imperfect.
>> e.g. $env x="() { :;}; `touch vulnerablefile`" bash -c "echo this is a test "
>
> If that is the command you ran, this doesn't show any vulnerability. The
> double quotes surrounding the assignment to x in the argument to `env'
> mean that command substitution is performed before env runs. It's the
> command substitution that creates the file, so the file exists before bash
> is invoked.
>
> 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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