CVE-2020-12760

An issue was discovered in OpenNMS Horizon before 26.0.1, and Meridian before 2018.1.19 and 2019 before 2019.1.7. The ActiveMQ channel configuration allowed for arbitrary deserialization of Java objects (aka ActiveMQ Minion payload deserialization), leading to remote code execution for any authenticated channel user regardless of its assigned permissions.

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/OpenNMS/opennms/releases/tag/opennms-26.0.1-1
• https://issues.opennms.org/browse/NMS-12673
• https://www.opennms.com/en/blog/2020-04-29-opennms-horizon-26-0-1-luchador-released/
• https://www.opennms.com/en/blog/2020-04-29-opennms-meridian-2018-1-18-wildfire-released/
• https://www.opennms.com/en/blog/2020-04-29-opennms-meridian-2019-1-6-europa-released/
• https://github.com/OpenNMS/opennms/releases/tag/opennms-26.0.1-1
• https://issues.opennms.org/browse/NMS-12673
• https://www.opennms.com/en/blog/2020-04-29-opennms-horizon-26-0-1-luchador-released/
• https://www.opennms.com/en/blog/2020-04-29-opennms-meridian-2018-1-18-wildfire-released/
• https://www.opennms.com/en/blog/2020-04-29-opennms-meridian-2019-1-6-europa-released/