CVE-2024-1895

The Event Monster – Event Management, Tickets Booking, Upcoming Event plugin for WordPress is vulnerable to PHP Object Injection in all versions up to, and including, 1.3.4 via deserialization via shortcode of untrusted input from a custom meta value. This makes it possible for authenticated attackers, with contributor access and above, to inject a PHP Object. No POP chain is present in the vulnerable plugin. If a POP chain is present via an additional plugin or theme installed on the target system, it could allow the attacker to delete arbitrary files, retrieve sensitive data, or execute code.

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://plugins.trac.wordpress.org/browser/event-monster/tags/1.3.3/shortcode.php
• https://www.wordfence.com/threat-intel/vulnerabilities/id/41d7b3f1-a133-4678-b2d9-3f9951cbc005?source=cve
• https://plugins.trac.wordpress.org/browser/event-monster/tags/1.3.3/shortcode.php
• https://www.wordfence.com/threat-intel/vulnerabilities/id/41d7b3f1-a133-4678-b2d9-3f9951cbc005?source=cve