Executive Summary

The Rate Star Review Vote - AJAX Reviews, Votes, Star Ratings plugin for WordPress has a vulnerability called Missing Authorization in all versions up to and including 1.6.4.

Specifically, the vwrsr_review() AJAX handler does not properly check user capabilities or verify nonces, relying only on a check that the user is logged in.

When the 'form' parameter is set to 'update', the function accepts an arbitrary post ID from the user-supplied 'rating_id' parameter and uses it to update the post via wp_update_post().

This allows an authenticated attacker with Subscriber-level access or higher to modify the title, content, author (which is changed to the attacker's user ID), post type, and status of any post or page on the site.

Additionally, the attacker can modify the metadata of the arbitrary post via update_post_meta(), effectively allowing full takeover of post content.

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Impact Analysis

This vulnerability allows authenticated users with low-level access (Subscriber and above) to modify any post or page on the WordPress site.

An attacker can change the title, content, author, post type, status, and metadata of arbitrary posts, which can lead to unauthorized content changes.

Such unauthorized modifications can result in defacement, misinformation, or insertion of malicious content, potentially damaging the site's integrity and reputation.

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