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Date: Wed, 24 Sep 2014 19:19:05 +0200
From: Florian Weimer <fweimer@...hat.com>
To: oss-security@...ts.openwall.com
Subject: Re: CVE-2014-6271: remote code execution through bash
On 09/24/2014 07:03 PM, Hanno Böck wrote:
> On Wed, 24 Sep 2014 18:30:35 +0200
> Florian Weimer <fweimer@...hat.com> wrote:
>
>> This depends on how PHP is invoked. mod_php does not set the CGI
>> environment variables.
>>
>> However, it is true that if CGI programs spawn subprocesses, they may
>> be affected even if the CGI program itself is not written in bash.
>
> Regarding php, isn't it quite common to run it through mod_fcgid with a
> (bash) wrapper script? At least that's what apache wiki documents:
> https://wiki.apache.org/httpd/php-fcgid
I don't know what's common with PHP. I don't think there is much public
documentation about what it takes to run PHP at scale in a secure
fashion (also taking compromised or downright malicious customers into
account).
> So that'd mean many php installations are affected even if they don't
> use subprocesses.
>
> I'm not sure if this wrapper can be avoided.
The wrapper does not run per request. I have not tested this, but I
don't think it sees any request-specific environment variables at this
point. FCGI transfers request information over a socket at descriptor 0
and not through environment variables.
--
Florian Weimer / Red Hat Product Security
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