An authenticated user with the nx-licensing-create privilege can upload a specially crafted license file to execute arbitrary operating system commands as the Nexus process user in Sonatype Nexus Repository 3 versions before 3.92.0.
Weakness
The product deserializes untrusted data without sufficiently ensuring that the resulting data will be valid.
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.