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Date: Sun, 28 Sep 2014 11:52:10 -0500
From: Bryan Drewery <bdrewery@...eBSD.org>
To: oss-security@...ts.openwall.com
Cc: chet.ramey@...e.edu, Christos Zoulas <christos@...las.com>
Subject: Re: Re: Re: CVE-2014-6271: remote code execution
through bash (3rd vulnerability)
On 2014-09-26 15:52, Bryan Drewery wrote:
> On 9/26/2014 9:13 AM, Christos Zoulas wrote:
>> On Sep 26, 1:47pm, john.haxby@...cle.com (John Haxby) wrote:
>> -- Subject: Re: [oss-security] Re: CVE-2014-6271: remote code
>> execution throu
>>
>> | It's not so much the known attacks -- redefining ls, unset, command,
>> | typeset, declare, etc -- it's the future parser bugs that we don't
>> yet
>> | know about.
>> |
>> | A friend of mine said this could be a vulnerability gift that keeps
>> on
>> | giving.
>>
>> I think that at this point the conservative approach is best, so
>> until the bash author figures what the best solution is, the feature
>> is disabled by default for NetBSD. It is not wise to expose bash's
>> parser to the internet and then debug it live while being attacked.
>>
>> christos
>>
>
> FreeBSD has taken a similar approach. We have used Christos' patch and
> disabled the feature by default.
>
> https://svnweb.freebsd.org/changeset/ports/369341
FYI I have updated the FreeBSD bash to 27 and modified the
--import-functions script to be implicit for interactive shells and to
also give a warning when functions are ignored.
https://svnweb.freebsd.org/ports/head/shells/bash/files/extrapatch-import-functions?revision=369467&view=co&pathrev=369467
--
Regards,
Bryan Drewery
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