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Wolf CMS 0.8.2 Shell Upload

Wolf CMS 0.8.2 Shell Upload
Posted Apr 18, 2015
Authored by CWH Underground, ZeQ3uL

Wolf CMS version 0.8.2 suffers from a remote shell upload vulnerability.

tags | exploit, remote, shell
SHA-256 | 4990d8207294db847c52a10db69b2d36845054777429b586fc9dc3d039882413

Wolf CMS 0.8.2 Shell Upload

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  ,--^----------,--------,-----,-------^--,
| ||||||||| `--------' | O .. CWH Underground Hacking Team ..
`+---------------------------^----------|
`\_,-------, _________________________|
/ XXXXXX /`| /
/ XXXXXX / `\ /
/ XXXXXX /\______(
/ XXXXXX /
/ XXXXXX /
(________(
`------'

Exploit Title : Wolf CMS Arbitrary File Upload Exploit
Date : 16 April 2015
Exploit Author : CWH Underground
Discovered By : ZeQ3uL
Site : www.2600.in.th
Vendor Homepage : https://www.wolfcms.org/
Software Link : https://bitbucket.org/wolfcms/wolf-cms-downloads/downloads/wolfcms-0.8.2.zip
Version : 0.8.2

####################
SOFTWARE DESCRIPTION
####################

Wolf CMS is a content management system and is Free Software published under the GNU General Public License v3.
Wolf CMS is written in the PHP programming language. Wolf CMS is a fork of Frog CMS.

#######################################
VULNERABILITY: Arbitrary File Upload
#######################################

This exploit a file upload vulnerability found in Wolf CMS 0.8.2, and possibly prior. Attackers can abuse the
upload feature in order to upload a malicious PHP file into the application with authenticated user, which results in arbitrary remote code execution.

The vulnerability was found on File Manager Function (Enabled by default), which provides interfaces to manage files from the administration.

In this simple example, there are no restrictions made regarding the type of files allowed for uploading.
Therefore, an attacker can upload a PHP shell file with malicious code that can lead to full control of a victim server.
Additionally, the uploaded file can be moved to the root directory, meaning that the attacker can access it through the Internet.

/wolf/plugins/file_manager/FileManagerController.php (LINE: 302-339)
-----------------------------------------------------------------------------
// Clean filenames
$filename = preg_replace('/ /', '_', $_FILES['upload_file']['name']);
$filename = preg_replace('/[^a-z0-9_\-\.]/i', '', $filename);

if (isset($_FILES)) {
$file = $this->_upload_file($filename, FILES_DIR . '/' . $path . '/', $_FILES['upload_file']['tmp_name'], $overwrite);

if ($file === false)
Flash::set('error', __('File has not been uploaded!'));
}
-----------------------------------------------------------------------------

#####################
Disclosure Timeline
#####################

[04/04/2015] – Issue reported to Developer Team
[08/04/2015] – Discussed for fixing the issue

################################################################################################################
# Greetz : ZeQ3uL, JabAv0C, p3lo, Sh0ck, BAD $ectors, Snapter, Conan, Win7dos, Gdiupo, GnuKDE, JK, Retool2
################################################################################################################
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