Executive Summary

The WP Promoter plugin for WordPress has a vulnerability in its reset_stats() function in versions up to and including 1.3. This function lacks proper capability checks, meaning it does not verify if the user is authorized to perform the action.

Because the function is hooked to both authenticated and unauthenticated AJAX actions without any authentication, authorization, or nonce validation, an attacker who is not logged in can reset the plugin's bar and popup statistics by deleting certain stored options.

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Impact Analysis

This vulnerability allows an unauthenticated attacker to reset the statistics tracked by the WP Promoter plugin, specifically the bar and popup statistics.

While it does not allow data disclosure or deletion beyond these statistics, it can impact the integrity of the plugin's data by allowing unauthorized modification, potentially disrupting analytics or marketing efforts that rely on these statistics.

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Detection Guidance

This vulnerability involves unauthorized modification of data via the reset_stats() function in the WP Promoter plugin for WordPress. Detection can focus on identifying unauthorized or suspicious requests to the AJAX actions wp_ajax_wpp-reset_stats and wp_ajax_nopriv_wpp-reset_stats, which are used to reset plugin statistics without authentication.

To detect exploitation attempts on your system or network, you can monitor web server logs for HTTP requests targeting the wp-admin/admin-ajax.php endpoint with the action parameter set to wpp-reset_stats.

• Use command-line tools like grep to search your web server access logs for suspicious requests, for example:
• grep 'admin-ajax.php?action=wpp-reset_stats' /var/log/apache2/access.log
• or for nginx logs:
• grep 'admin-ajax.php?action=wpp-reset_stats' /var/log/nginx/access.log

Additionally, monitoring for unexpected resets of the wpp_bar and wpp_popup options in the WordPress database could indicate exploitation.

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Mitigation Strategies

To mitigate this vulnerability immediately, you should update the WP Promoter plugin to a version later than 1.3 where the missing capability check on the reset_stats() function is fixed.

If an update is not immediately available, consider temporarily disabling the plugin or restricting access to the wp-admin/admin-ajax.php endpoint to trusted users only.

Implementing web application firewall (WAF) rules to block unauthenticated requests to the wp_ajax_wpp-reset_stats and wp_ajax_nopriv_wpp-reset_stats actions can also help prevent exploitation.

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Compliance Impact

The vulnerability allows unauthenticated attackers to reset plugin statistics by deleting certain options without authorization. However, there is no indication that this leads to unauthorized access to personal or sensitive data, or impacts data confidentiality or integrity beyond the plugin's statistics.

Given the nature of the vulnerability and the CVSS impact metrics (no confidentiality or availability impact, only integrity impact limited to the plugin's statistics), it is unlikely to directly affect compliance with standards like GDPR or HIPAA, which focus on protection of personal and sensitive data.

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