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Date: Thu, 28 Jun 2012 12:29:59 -0600
From: Kurt Seifried <kseifried@...hat.com>
To: oss-security@...ts.openwall.com
CC: Zeev Suraski <zeev@...d.com>, Stuart Henderson <stu@...cehopper.org>,
"security@....net" <security@....net>
Subject: Re: Re: PHP information disclosure via easter egg
?=PHPB8B5F2A0-3C92-11d3-A3A9-4C7B08C10000
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Hash: SHA1
On 06/28/2012 07:24 AM, Zeev Suraski wrote:
>> Would you expect a variable described as "Decides whether PHP may
>> expose the fact that it is installed on the server" to control
>> whether an anonymous user can fetch a list of enabled modules?
>
> I wouldn't, and thankfully it does not. The list you're seeing has
> nothing to do with what's enabled or disabled on the server. It's
> a build-time list of all the modules that were available in the
> source tree. It's completely static for a given version of PHP.
> As an example, in the abovementioned URL, you see NSAPI, ISAPI and
> Apache 2.0 mentioned, although this is an Apache 1.3 server. We
> also surely don't have COM and .NET installed on that Linux server
> either.
>
> This is definitely not a security issue of any kind.
>
> Zeev
>
Yeah my bad, I just skimmed the list (it was late). Just for future
reference as well the other magic values are:
ext/standard/info.h:#define PHP_LOGO_GUID
"PHPE9568F34-D428-11d2-A769-00AA001ACF42"
ext/standard/info.h:#define PHP_EGG_LOGO_GUID
"PHPE9568F36-D428-11d2-A769-00AA001ACF42"
ext/standard/info.h:#define ZEND_LOGO_GUID
"PHPE9568F35-D428-11d2-A769-00AA001ACF42"
ext/standard/info.h:#define PHP_CREDITS_GUID
"PHPB8B5F2A0-3C92-11d3-A3A9-4C7B08C10000"
I guess I'm just not a huge fan of surprises in my software =). The
expose_php variable appears to control them all no problem.
- --
Kurt Seifried Red Hat Security Response Team (SRT)
PGP: 0x5E267993 A90B F995 7350 148F 66BF 7554 160D 4553 5E26 7993
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