WordPress Add From Server 6.2 Cross Site Request Forgery
Posted on 10 August 2016
------------------------------------------------------------------------ Cross-Site Request Forgery vulnerability in Add From Server WordPress Plugin ------------------------------------------------------------------------ Edwin Molenaar, July 2016 ------------------------------------------------------------------------ Abstract ------------------------------------------------------------------------ It was discovered that Add From Server is vulnerabile to Cross-Site Request Forgery. It can be exploited by luring the target user into clicking a specially crafted link or visiting a malicious website (or advertisement). An attacker can use this issue to add illegal content to the victims server, or add very large files to the victim's server to exaust the amount of avalible disk space. ------------------------------------------------------------------------ OVE ID ------------------------------------------------------------------------ OVE-20160718-0004 ------------------------------------------------------------------------ Tested versions ------------------------------------------------------------------------ These issues were successfully tested on Add From Server WordPress Plugin version 6.2. ------------------------------------------------------------------------ Fix ------------------------------------------------------------------------ This issue is resolved in Add From Server version 3.3.2. ------------------------------------------------------------------------ Details ------------------------------------------------------------------------ https://sumofpwn.nl/advisory/2016/cross_site_request_forgery_vulnerability_in_add_from_server_wordpress_plugin.html When a (media) file is added from the server, the source is not validated. This means that not only files from the localhost can be added, but also from other sources. The affected code is not protected with an anti-Cross-Site Request Forgery token. The function handle_imports() only removes slashes. The vulnerability exists in the file add-from-server/class.add-from-server.php (line 213). Because slashes are removed, the file that will be uploaded must exist in the server root. For example: www.example.com/largefile.txt The host and filename will be set in a separate parameter, so no slashes are needed. Proof of concept POST /wp-admin/upload.php?page=add-from-server HTTP/1.1 Host: <target> Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8 Connection: close Content-Type: application/x-www-form-urlencoded files%5B%5D=largefile.txt&import-date=current&cwd=www.example.com&import=Import ------------------------------------------------------------------------ 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.
