In order to share files between two systems, an IT department has decided to share disk storage in a SAN device. The volumes are shared by NFS. The two machines mount the same volume in the SAN.
The problem is that the two machines are in different security zones. Machine A is trusted but we assume machine B is compromised (not trusted).
For example, any malicious file created by the compromised machine will be available to the trusted machine but if nobody executes the malicious file I suppose there is no impact.
What are the security risks for the trusted machine?
What security measure can be implemented in order to protect the trusted machine from the compromised machine?