Executive Summary

The WooCommerce Infinite Scroll and Ajax Pagination plugin for WordPress is vulnerable to PHP Object Injection in all versions up to and including 1.8. This vulnerability arises because the plugin deserializes untrusted data supplied via the 'settings' parameter in the 'import_settings' function without performing capability checks.

Authenticated attackers with Subscriber-level access or higher can exploit this flaw to inject a PHP Object. Although the vulnerable plugin itself does not contain a POP (Property Oriented Programming) chain, if another plugin or theme installed on the system has such a chain, the attacker could leverage it to delete arbitrary files, retrieve sensitive data, or execute arbitrary code.

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Impact Analysis

This vulnerability can have severe impacts including the potential for an attacker to delete arbitrary files, retrieve sensitive information, or execute arbitrary code on the affected system.

Since the attack requires only Subscriber-level access, it lowers the barrier for exploitation, making it easier for less privileged users to cause significant harm.

The overall impact includes confidentiality, integrity, and availability being compromised, as reflected by the high CVSS score of 8.8.

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Detection Guidance

This vulnerability exists in the WooCommerce Infinite Scroll and Ajax Pagination plugin for WordPress, specifically in versions up to and including 1.8. Detection involves identifying if this plugin and vulnerable version is installed on your WordPress site.

You can detect the presence of the vulnerable plugin and version by checking the installed plugins list in WordPress or by inspecting the plugin files on the server.

• Use WP-CLI to list installed plugins and their versions: wp plugin list
• Check the plugin directory for the version file or readme.txt to confirm the version.
• Look for suspicious HTTP requests targeting the 'import_settings' function or the 'settings' parameter, which could indicate exploitation attempts.
• Monitor web server logs for POST requests containing 'import_settings' or unusual serialized PHP objects in parameters.

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Mitigation Strategies

The primary mitigation step is to update the WooCommerce Infinite Scroll and Ajax Pagination plugin to a version later than 1.8 where this vulnerability is fixed.

If an update is not immediately available, consider disabling or removing the plugin to prevent exploitation.

Restrict access to the import configuration feature to trusted users only, as the vulnerability requires authenticated access at Subscriber level or above.

Implement web application firewall (WAF) rules to block requests attempting to exploit the 'import_settings' function or containing suspicious serialized data.

Regularly monitor logs for exploitation attempts and unauthorized access.

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Compliance Impact

The vulnerability allows authenticated attackers with Subscriber-level access and above to perform PHP Object Injection via deserialization of untrusted data without capability checks. This could potentially lead to deletion of arbitrary files, retrieval of sensitive data, or code execution if a POP chain is present through other plugins or themes.

Such unauthorized access and potential data exposure or manipulation could impact compliance with data protection regulations like GDPR and HIPAA, which require safeguarding sensitive data and ensuring system integrity.

However, the provided information does not explicitly detail the compliance impact or specific regulatory consequences.

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