The Easy PHP Settings plugin for WordPress is vulnerable to PHP Code Injection in all versions up to, and including, 1.0.4 via the `update_wp_memory_constants()` method. This is due to insufficient input validation on the `wp_memory_limit` and `wp_max_memory_limit` settings before writing them to `wp-config.php`. The `sanitize_text_field()` function used for sanitization does not filter single quotes, allowing an attacker to break out of the string context in a PHP `define()` statement.
This makes it possible for authenticated attackers, with Administrator-level access and above, to inject and execute arbitrary PHP code on the server by modifying `wp-config.php`, which is loaded on every page request.
Attack Parameters
Attack Vector
Network
Can be exploited remotely
Attack Complexity
Low
Easy to exploit
Privileges Required
High
Admin privileges needed
User Interaction
None
No user interaction needed
Impact Assessment
Confidentiality
High
Complete data leak
Integrity
High
Complete data modification
Availability
High
Complete denial of service
CVSS Vector v3.1
Weakness Type (CWE)
References 4
https://plugins.trac.wordpress.org/browser/easy-php-settings/tags/1.0.4/class-e…
security@wordfence.com
https://plugins.trac.wordpress.org/browser/easy-php-settings/tags/1.0.5/class-e…
security@wordfence.com
https://plugins.trac.wordpress.org/browser/easy-php-settings/trunk/class-easy-p…
security@wordfence.com
https://www.wordfence.com/threat-intel/vulnerabilities/id/f9927487-99fb-46d9-a2…
security@wordfence.com