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Posted on 03 October 2007
Original Photo Gallery Remote Command Execution Name Original Photo Gallery Remote Command Execution Systems Affected Original 0.11.2 version and below Severity High Vendor http://jimmac.musichall.cz/original.php Advisory http://www.ush.it/team/ascii/hack-original/advisory_updated.txt http://www.ush.it/team/ascii/hack-original/advisory.txt Author Francesco `ascii` Ongaro, Antonio `s4tan` Parata Date 20070919 I. BACKGROUND "Original is a set of scripts to get your digital photos on the web. It aims to be as simple to maintain as possible." The systems consist of two parts: "a client side script to scale your images to different sizes, create archives of an album, attach optional metadata" and a "php script to render html pages of the picture gallery". II. DESCRIPTION It's possible to execute arbitrary code on remote systems which have installed a vulnerable software version. III. ANALYSIS The file "inc/exif.inc.php" contains the following vulnerable statement: exec("$exif_prog "$gallery_dir/$galerie/lq/img-$snimek.jpg"", $exif_data, $exif_status);". If PHP is configured with the "globals on" option, an attacker can execute arbitrary code doing a direct request to the file and sending shell commands in the parameter/value $exif_prog. IV. DETECTION http://www.x.com/original/inc/exif.inc.php?exif_prog=/path/to/touch%20/tmp/p0wn3d.txt; The request should create a file in the /tmp directory (on Unix systems) named p0wn3d.txt. If this happens than you have a vulnerable version of the software (and a really risky PHP setup). A rapid measurement show that ~10% systems are vulnerable of about 17'000 listed on Google (using the dork: "Generated by Original ver"). V. WORKAROUND Upgrade to the new version 0.11.3 witch fix this vulnerability. http://jimmac.musichall.cz/zip/original/original-0.11.3.tar.bz2 Or if unable to upgrade: 1) Disable access to the directory using Limit (vhosts/.htaccess). 2) Disable execution using disable_functions in php.ini. The result is: Warning: exec() has been disabled for security reasons in /home/XXX/inc/exif.inc.php on line 157 3) Deny direct access to the file in the PHP code by checking for a define or requested url. VI. VENDOR RESPONSE The vendor has promptly replied and addressed the problem issuing a new release. Original version 0.11.3 is available here: http://jimmac.musichall.cz/zip/original/original-0.11.3.tar.bz2 VII. CVE INFORMATION No CVE at this time. VIII. DISCLOSURE TIMELINE 20070719 Bug discovered 20070725 Vendor contacted 20070927 Vendor reply and fix 20071002 Advisory released IX. CREDIT Francesco `ascii` Ongaro and Antonio `s4tan` Parata are credited with the discovery of this vulnerability. X. LEGAL NOTICES Copyright (c) 2007 Francesco `ascii` Ongaro Note: this exploit is DUAL LICENSED, 1. if you'll use it for personal and non-profit purposes you can apply GPL v2 and above. 2. In the case you plain to: a. use our code in any commercial context b. implement this code in your non-GPL application c. use this code during a Penetration Test d. make any profit from it you need to contact me in order to obtain a _commercial license_. For more informations about Dual Licensing: http://producingoss.com/html-chunk/dual-licensing.html Permission is granted for the redistribution of this alert electronically. It may not be edited in any way without mine express written consent. If you wish to reprint the whole or any part of this alert in any other medium other than electronically, please email me for permission. Disclaimer: The information in the advisory is believed to be accurate at the time of publishing based on currently available information. Use of the information constitutes acceptance for use in an AS IS condition. There are no warranties with regard to this information. Neither the author nor the publisher accepts any liability for any direct, indirect, or consequential loss or damage arising from use of, or reliance on, this information.
