CVE-2022-39298

MelisFront is the engine that displays website hosted on Melis Platform. It deals with showing pages, plugins, URL rewritting, search optimization and SEO, etc. Attackers can deserialize arbitrary data on affected versions of melisplatform/melis-front, and ultimately leads to the execution of arbitrary PHP code on the system. Conducting this attack does not require authentication. Users should immediately upgrade to melisplatform/melis-front >= 5.0.1. This issue was addressed by restricting allowed classes when deserializing user-controlled data.

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/melisplatform/melis-front/commit/89ae612d5f1f7aa2fb621ee8de27dffe1feb851e
• https://github.com/melisplatform/melis-front/security/advisories/GHSA-h479-2mv4-5c26
• https://github.com/melisplatform/melis-front/commit/89ae612d5f1f7aa2fb621ee8de27dffe1feb851e
• https://github.com/melisplatform/melis-front/security/advisories/GHSA-h479-2mv4-5c26