[UNIX] CGI SAPI Security Vulnerability

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From: support@securiteam.com
To: list@securiteam.com
Date: 17 Feb 2003 22:36:21 +0200

The following security advisory is sent to the securiteam mailing list, and can be found at the SecuriTeam web site: http://www.securiteam.com
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  CGI SAPI Security Vulnerability
------------------------------------------------------------------------

SUMMARY

PHP contains code for preventing direct access to the CGI binary with
configure option "--enable-force-cgi-redirect" and php.ini option
"cgi.force_redirect". In PHP version 4.3.0 there is a bug that renders
these options useless.

NOTE: This bug does NOT affect any of the other SAPI modules (such as the
Apache or ISAPI modules, etc.).

DETAILS

Vulnerable systems:
 * PHP version 4.3.0

Immune systems:
 * PHP version 4.3.1

Impact:
Anyone with access to websites hosted on a web server that employs the CGI
module may exploit this vulnerability to gain access to any file readable
by the user under which the web server runs.

A remote attacker could also trick PHP into executing arbitrary PHP code
if attacker is able to inject the code into files accessible by the CGI.
This could be for example the web server access-logs.

Solution:
The PHP Group has released a new PHP version, 4.3.1, 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> http://www.php.net/downloads.php

This URL links to the source tarballs, Windows binaries, and source patch
from 4.3.0. You will only need to upgrade if you are using the CGI module
of PHP 4.3.0. There are no other bug fixes contained in this release.

ADDITIONAL INFORMATION

The information has been provided by <mailto:sniper@php.net> Jani
Taskinen.

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