Unauthenticated PHP Object Injection in Adrena

Executive Summary

This is an unauthenticated PHP Object Injection vulnerability in the Adrena WordPress theme versions up to 1.2.14. It allows attackers to inject malicious PHP objects without authentication, potentially leading to code execution, SQL injection, or other attacks if a suitable exploit chain exists.

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Detection Guidance

Detecting this vulnerability requires checking if the Adrena theme version 1.2.14 or lower is installed on your WordPress site. Inspect theme files for suspicious PHP object injection patterns or unexpected network requests. Use commands like grep -r 'unserialize' /path/to/theme/ to search for unserialize() calls which may indicate vulnerable code.

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Impact Analysis

This vulnerability can allow attackers to take full control of your website, steal data, deface content, or use it as a launchpad for further attacks. Since no authentication is required, any unpatched site is at immediate risk of exploitation.

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Mitigation Strategies

Immediately apply Patchstack's temporary mitigation rule if available. Disable the Adrena theme and switch to a default theme if possible. Contact your hosting provider for assistance. Monitor for unusual activity and consider blocking known exploit patterns via WAF rules until an official patch is released.

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