[VulnWatch] PHP Security Advisory: CGI vulnerability in PHP version 4.3.0

From: Jani Taskinen (sniper@php.net)
Date: 02/17/03

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    Date: Mon, 17 Feb 2003 20:01:14 +0200 (EET)
    From: Jani Taskinen <sniper@php.net>
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       PHP Security Advisory: CGI vulnerability in PHP version 4.3.0

    Issued on: February 17, 2003
    Software: PHP/CGI version 4.3.0
    Platforms: All

       The PHP Group has learned of a serious security vulnerability in
       the CGI SAPI of PHP version 4.3.0.
       

    Description

       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 4.3.0 there is a bug which renders these
       options useless.
       
       NOTE: This bug does NOT affect any of the other SAPI modules.
             (such as the Apache or ISAPI modules, etc.)

    Impact

       Anyone with access to websites hosted on a web server which employs
       the CGI module may exploit this vulnerability to gain access to any file
       readable by the user under which the webserver 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
       
       has the new 4.3.1 source tarballs, Windows binaries and source patch
       from 4.3.0 available for download. You will only need to upgrade if
       you're using the CGI module of PHP 4.3.0. There are no other bugfixes
       contained in this release.

    Workaround

       None.

     
    Credits

       The PHP Group would like to thank Kosmas Skiadopoulos for discovering
       this vulnerability.

    Copyright (c) 2003 The PHP Group.

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