oss-security - Re: CVE-2014-6271: remote code execution through bash

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Message-ID: <5424BC3B.9080906@case.edu>
Date: Thu, 25 Sep 2014 21:07:07 -0400
From: Chet Ramey <chet.ramey@...e.edu>
To: oss-security@...ts.openwall.com
CC: Solar Designer <solar@...nwall.com>, chet.ramey@...e.edu,
        Tavis Ormandy <taviso@...xchg8b.com>, lcamtuf@...edump.cx
Subject: Re: CVE-2014-6271: remote code execution through bash

On 9/24/14, 9:30 PM, Solar Designer wrote:
> On Wed, Sep 24, 2014 at 06:26:53PM -0700, Anthony Liguori wrote:
>> On Wed, Sep 24, 2014 at 6:23 PM, Chet Ramey <chet.ramey@...e.edu> wrote:
>>> On 9/24/14, 5:32 PM, Solar Designer wrote:
>>>> On Wed, Sep 24, 2014 at 11:27:09PM +0200, Hanno B??ck wrote:
>>>>> Tavis Ormandy just tweetet this:
>>>>> https://twitter.com/taviso/status/514887394294652929
>>>>>
>>>>> The bash patch seems incomplete to me, function parsing is still
>>>>> brittle. e.g. $ env X='() { (a)=>\' sh -c "echo date"; cat echo
>>>>
>>>> Thanks for bringing this to oss-security.  I've added CC to Chet and
>>>> Tavis on this "reply".
>>>
>>> I have a fix for this.
>>
>> Can you provide a pointer to the patch?  I put together a patch that
>> changed the report_error() to fatal_error() as I wasn't able to see
>> how to reset the parser state.  Was just about to send it out...

I have positive confirmation that this patch works, so here are patches for
bash versions bash-2.05b to bash-4.3.

I will probably push these out tomorrow.

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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