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

[Chet Ramey <chet.ramey () case edu>]

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 () case 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 () case edu    http://cnswww.cns.cwru.edu/~chet/

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