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Date: Thu, 28 Jun 2012 02:53:59 -0600
From: Kurt Seifried <kseifried@...hat.com>
To: oss-security@...ts.openwall.com
Subject: Re: PHP information disclosure via easter egg ?=PHPB8B5F2A0-3C92-11d3-A3A9-4C7B08C10000
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On 06/28/2012 12:13 AM, Pierre Joye wrote:
> hi Kurt!
>
> On Thu, Jun 28, 2012 at 7:12 AM, Kurt Seifried
> <kseifried@...hat.com> wrote:
>
>> So simply querying:
>>
>> ?=PHPB8B5F2A0-3C92-11d3-A3A9-4C7B08C10000
>>
>> e.g.:
>>
>> http://php.net/?=PHPB8B5F2A0-3C92-11d3-A3A9-4C7B08C10000
>>
>> shows authors, SAPI modules (and their authors) and normal
>> modules (and their authors), resulting in a significant
>> information disclosure (version #'s can be narrowed down from the
>> authors list).
>>
>> This has already been reported, but no CVE was assigned:
>>
>> https://bugs.php.net/bug.php?id=55497
>>
>> It is mentioned in http://php.net/manual/en/ini.core.php however
>> it is enabled by default:
>>
>> ; Decides whether PHP may expose the fact that it is installed on
>> the server ; (e.g. by adding its signature to the Web server
>> header). It is no security ; threat in any way, but it makes it
>> possible to determine whether you use PHP ; on your server or
>> not.
>>
>> ; http://www.php.net/manual/en/ini.core.php#ini.expose-php
>>
>> expose_php = On
>
> Why would it require a CVE and why is it seen as a security issue?
> Sure it could be, like unfiltered input and the like but...
>
> Cheers,
I wasn't asking for a CVE for this issue (no "CVE Request: in
subject), This is more of a place holder/information (oss-security is
read by a lot of security vendors/etc, and is for more than just CVE
assignments) and to make sure people are aware of the issue, since I
wasn't even aware of it until someone pointed it out to me.
Exposing the fact that I am running PHP is one thing. Exposing exactly
which modules I have loaded is quite another.
- --
Kurt Seifried Red Hat Security Response Team (SRT)
PGP: 0x5E267993 A90B F995 7350 148F 66BF 7554 160D 4553 5E26 7993
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