Executive Summary

This vulnerability exists in the Blog2Social WordPress plugin up to version 8.7.2. It is caused by a misconfigured authorization check in the 'getShipItemFullText' function, which only verifies that a user has the 'read' capability and a valid nonce but does not check if the user has permission to access the specific post requested. As a result, authenticated users with Subscriber-level access or higher can extract data from password-protected, private, or draft posts that they should not normally be able to access. [1]

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Impact Analysis

The vulnerability allows attackers with Subscriber-level access or above to access sensitive information from posts that are password-protected, private, or drafts. This could lead to unauthorized disclosure of confidential or sensitive content, potentially compromising privacy or business information. [1]

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Detection Guidance

This vulnerability can be detected by monitoring AJAX requests to the WordPress plugin Blog2Social, specifically requests to the 'b2s_ship_item' AJAX action which invokes the 'getShipItemFullText' function. Detection involves checking for authenticated users with Subscriber-level access making AJAX calls that retrieve full text of password-protected, private, or draft posts. You can inspect HTTP logs or use tools like curl or wget to simulate such AJAX requests with valid nonces and Subscriber credentials to see if unauthorized post data is returned. Example command to test (replace URL, nonce, and cookies accordingly): curl -X POST -d "action=b2s_ship_item&b2s_security_nonce=VALID_NONCE&post_id=TARGET_POST_ID" -b "wordpress_logged_in=COOKIE_VALUE" https://yourwordpresssite.com/wp-admin/admin-ajax.php [1]

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Mitigation Strategies

Immediate mitigation steps include updating the Blog2Social plugin to a version later than 8.7.2 where this vulnerability is fixed. If an update is not immediately possible, restrict Subscriber-level users from accessing the AJAX endpoints related to 'getShipItemFullText' by implementing additional authorization checks or temporarily disabling the plugin. Additionally, monitor and audit AJAX requests to detect suspicious access patterns. Applying strict capability checks beyond 'read' and verifying user permissions for specific posts can help mitigate exploitation. [1]

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Compliance Impact

The provided resources do not contain information regarding the impact of this vulnerability on compliance with common standards and regulations such as GDPR or HIPAA.

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