From: Paul.Tinsley at phyve.com (Paul Tinsley)
Subject: PHP Exploit

IMHO, any box that has an Apache web server running PHP, needs to be
updated.  If you look at the comments on the IA32 platform states that it
can crash PHP and or the web server itself, still deeming it capable of a
nasty denial of service attack.

--
Paul Tinsley
paul.tinsley@...ve.com
 

-----Original Message-----
From: KF [mailto:dotslash@...soft.com] 
Sent: Monday, July 22, 2002 1:59 PM
To: full-disclosure@...ts.netsys.com
Subject: Re: [Full-Disclosure] PHP Exploit

Out of curriosity who did the verification that this was not exploitable 
on IA32? The same guys that determined x86 apache was not exploitable? 
Were a range of OS's tested or just one OS with an IA32 processor? 
Should we take their word?
-KF


Paul Tinsley wrote:

>Sorry if this was already posted but, this is a serious vulnerability given
>the wide spread use of PHP, and the plenty of people that have it on by
>default that don't actually use it.
>
>For those that are familiar with http://www.apachetoolbox.com, a build tool
>for apache, It was patched at 8:46 this morning:
>
>v1.5.59		07/22/02
>		PDFLib patch sent in by Dominique Massonie. Updated PHP
>		to v4.2.2.
>
>Venerability Text from PHP site:
>
>http://www.php.net/release_4_2_2.php
>
>Issued on:    July 22, 2002 
>Software:    PHP versions 4.2.0 and 4.2.1 
>Platforms:    All 
>
>
>The PHP Group has learned of a serious security vulnerability in PHP
>versions 4.2.0 and 4.2.1. An intruder may be able to execute arbitrary code
>with the privileges of the web server. This vulnerability may be exploited
>to compromise the web server and, under certain conditions, to gain
>privileged access.
>
>Description
>PHP contains code for intelligently parsing the headers of HTTP POST
>requests. The code is used to differentiate between variables and files
sent
>by the user agent in a "multipart/form-data" request. This parser has
>insufficient input checking, leading to the vulnerability.
>
>The vulnerability is exploitable by anyone who can send HTTP POST requests
>to an affected web server. Both local and remote users, even from behind
>firewalls, may be able to gain privileged access.
>
>Impact
>Both local and remote users may exploit this vulnerability to compromise
the
>web server and, under certain conditions, to gain privileged access. So far
>only the IA32 platform has been verified to be safe from the execution of
>arbitrary code. The vulnerability can still be used on IA32 to crash PHP
>and, in most cases, the web server.
>
>Solution
>The PHP Group has released a new PHP version, 4.2.2, which incorporates a
>fix for the vulnerability. All users of affected PHP versions are
encouraged
>to upgrade to this latest version. The downloads web site at 
>
>http://www.php.net/downloads.php
>has the new 4.2.2 source tarballs, Windows binaries and source patches from
>4.2.0 and 4.2.1 available for download.
>
>Workaround
>If the PHP applications on an affected web server do not rely on HTTP POST
>input from user agents, it is often possible to deny POST requests on the
>web server.
>
>In the Apache web server, for example, this is possible with the following
>code included in the main configuration file or a top-level .htaccess file:

>
><Limit POST>
>   Order deny,allow
>   Deny from all
></Limit>
>
>Note that an existing configuration and/or .htaccess file may have
>parameters contradicting the example given above.
>
>Credits
>The PHP Group would like to thank Stefan Esser of e-matters GmbH for
>discovering this vulnerability. e-matters GmbH has also released an
>independent advisory, describing the vulnerability in more detail.
>
>--
>Paul Tinsley
>paul.tinsley@...ve.com
>_______________________________________________
>Full-Disclosure - We believe in it.
>Full-Disclosure@...ts.netsys.com
>http://lists.netsys.com/mailman/listinfo/full-disclosure
>
>
>  
>



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