CVE-2020-36726

The Ultimate Reviews plugin for WordPress is vulnerable to PHP Object Injection in versions up to, and including, 2.1.32 via deserialization of untrusted input in several vulnerable functions. This allows unauthenticated attackers to inject a PHP Object. No POP chain is present in the vulnerable plugin.

Weakness

The product deserializes untrusted data without sufficiently ensuring that the resulting data will be valid.

Affected Software

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

• https://cwe.mitre.org/data/definitions/586.html

References

• https://blog.nintechnet.com/wordpress-ultimate-reviews-plugin-fixed-insecure-deserialization-vulnerability/
• https://plugins.trac.wordpress.org/changeset/2409141
• https://www.wordfence.com/threat-intel/vulnerabilities/id/db30acd7-ce51-45d9-8ff0-6ceea8237a8c?source=cve
• https://blog.nintechnet.com/wordpress-ultimate-reviews-plugin-fixed-insecure-deserialization-vulnerability/
• https://plugins.trac.wordpress.org/changeset/2409141
• https://www.wordfence.com/threat-intel/vulnerabilities/id/db30acd7-ce51-45d9-8ff0-6ceea8237a8c?source=cve