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Date: Fri, 26 Sep 2014 11:47:49 +0100
From: John Haxby <john.haxby@...cle.com>
To: oss-security@...ts.openwall.com
Subject: Re: Re: Non-upstream patches for bash
On 26/09/14 01:23, Ángel González wrote:
> Forwarding to the oss-security thread the patch I sent to bug-bash
> 1 hour ago.
>
> The trick here is to delay parsing of functions coming from the
> environment until they are actually needed.
>
> Thus extra code (CVE-2014-6271) or even a parsing vulnerability like
> CVE-2014-7169 won't be triggered unless you attempt to run the exported
> function (or you use a builtin such as declare or type that must print
> the code, things like type -t are safe to use).
Even with this?
type='() { echo hi there; }' bash
(Or the added stuff from Florian's patch).
I got myself into a right old mess by redefining declare, typeset, unset
and command.
>
> It can be applied standalone (and remain compatible with older bash
> versions), or it could be combined with some of the other patches.
> It also makes bash more efficient by not parsing unused functions :)
>
> Although it passes the testsuite, it has only been lightly tested, don't
> install in your nuclear plant yet. 😉
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