[SECURITY-L] PHP Security Advisory: CGI vulnerability in PHP version 4.3.0

[Silvana Mieko Misuta]

Subject: [Fwd: PHP Security Advisory: CGI vulnerability in PHP
             version 4.3.0]
        Date: Tue, 18 Feb 2003 11:55:37 -0300
       From: Renato Murilo Langona <renato em linuxsecurity.com.br>
 Organization: LinuxSecurity Brasil Solutions
(http://www.linuxsecurity.com.br)


Jani Taskinen wrote:

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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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--
[Renato Murilo Langona] - LinuxSecurity Brasil Solutions S/C Ltda.