The Search Regex plugin for WordPress is vulnerable to PHP Object Injection in version 3.5 via deserialization of untrusted input in the replace_all function. This allows authenticated attackers, with subscriber-level access and above, to inject a PHP Object. The additional presence of a POP chain allows attackers to execute code.
Weakness
The product deserializes untrusted data without sufficiently ensuring that the resulting data will be valid.
Potential Mitigations
- Make fields transient to protect them from deserialization.
- An attempt to serialize and then deserialize a class containing transient fields will result in NULLs where the transient data should be. This is an excellent way to prevent time, environment-based, or sensitive variables from being carried over and used improperly.
Related Attack Patterns
References
- https://plugins.trac.wordpress.org/changeset?reponame=\u0026new=3730910%40search-regex%2Ftags%2F3.5.1\u0026old=3729403%40search-regex%2Ftags%2F3.5
- https://www.wordfence.com/threat-intel/vulnerabilities/id/cb801c72-0e50-4df1-88cc-30f8037c6d3c?source=cve