CVE-2022-3861

The Betheme theme for WordPress is vulnerable to PHP Object Injection in versions up to, and including, 26.5.1.4 via deserialization of untrusted input supplied via the import, mfn-items-import-page, and mfn-items-import parameters passed through the mfn_builder_import, mfn_builder_import_page, importdata, importsinglepage, and importfromclipboard functions. This makes it possible for authenticated attackers, with contributor level permissions and above to inject a PHP Object. The additional presence of a POP chain would make it possible for attackers to execute code, retrieve sensitive data, delete files, etc..

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://github.com/MrTuxracer/advisories/blob/master/CVEs/CVE-2022-3861.txt
• https://muffingroup.com/betheme/
• https://www.wordfence.com/vulnerability-advisories-continued/#CVE-2022-3861
• https://github.com/MrTuxracer/advisories/blob/master/CVEs/CVE-2022-3861.txt
• https://muffingroup.com/betheme/
• https://www.wordfence.com/vulnerability-advisories-continued/#CVE-2022-3861