AUSCERT External Security Bulletin Redistribution

                  ESB-2003.0098 -- PHP Security Advisory
                  CGI vulnerability in PHP version 4.3.0
                             18 February 2003


        AusCERT Security Bulletin Summary

Product:                PHP version 4.3.0
Vendor:                 The PHP Group
Impact:                 Execute Arbitrary Code/Commands
                        Increased Privileges
Access Required:        Remote

- --------------------------BEGIN INCLUDED TEXT--------------------

Hash: SHA1

   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. 


   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.)


   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.


   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

   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.




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

Copyright (c) 2003 The PHP Group.

Version: GnuPG v1.0.6 (GNU/Linux)
Comment: For info see http://www.gnupg.org


- --------------------------END INCLUDED TEXT--------------------

You have received this e-mail bulletin as a result of your organisation's
registration with AusCERT. The mailing list you are subscribed to is
maintained within your organisation, so if you do not wish to continue
receiving these bulletins you should contact your local IT manager. If
you do not know who that is, please send an email to auscert@auscert.org.au
and we will forward your request to the appropriate person.

This security bulletin is provided as a service to AusCERT's members.  As
AusCERT did not write the document quoted above, AusCERT has had no control
over its content.  The decision to use any or all of this information is
the responsibility of each user or organisation, and should be done so in
accordance with site policies and procedures.

NOTE: This is only the original release of the security bulletin.  It may
not be updated when updates to the original are made.  If downloading at
a later date, it is recommended that the bulletin is retrieved directly
from the author's website to ensure that the information is still current.

Contact information for the authors of the original document is included
in the Security Bulletin above.  If you have any questions or need further
information, please contact them directly.

Previous advisories and external security bulletins can be retrieved from:


If you believe that your system has been compromised, contact AusCERT or
your representative in FIRST (Forum of Incident Response and Security

Internet Email: auscert@auscert.org.au
Facsimile:      (07) 3365 7031
Telephone:      (07) 3365 4417 (International: +61 7 3365 4417)
                AusCERT personnel answer during Queensland business 
                hours which are GMT+10:00 (AEST).  On call after hours 
                for member emergencies only.

Version: 2.6.3i
Charset: noconv
Comment: http://www.auscert.org.au/render.html?it=1967