CVE-2013-7233

Step 1: Victim Login: An administrator logs into the vulnerable WordPress installation. Step 2: Attacker Crafting: The attacker crafts a malicious HTML page or email containing a hidden form or JavaScript that automatically submits a request to wp-admin/options-discussion.php to move comments to moderation. Step 3: Victim Interaction: The administrator, while logged in, visits the attacker's malicious page or opens the malicious email. This triggers the hidden form submission. Step 4: Request Execution: The administrator's browser, still authenticated to the WordPress site, sends the crafted request to the server. Because there is no CSRF protection, the server processes the request as if it originated from the administrator. Step 5: Comment Manipulation: The WordPress server moves the targeted comments to the moderation queue, effectively hiding them from public view or potentially causing a denial-of-service by overwhelming the moderation queue.

The vulnerability stems from a lack of CSRF protection in the wp-admin/options-discussion.php file, specifically when handling requests related to comment moderation. The WordPress code fails to validate the origin of requests, allowing an attacker to craft a malicious request that, when executed by an authenticated administrator, moves comments to the moderation queue. This is a classic example of a missing CSRF token or improper implementation of CSRF protection. The flaw lies in the absence of a mechanism to verify the legitimacy of the request's origin, such as a unique, unpredictable token embedded in the form and validated on the server-side.