Preventing outside sources accessing the local network via o

I've been asked to look into the potential of outside sources gaining access to our local network via networked/shared printers. As far as I understand, the main threat is from unused ports being left open. As printers often have some form of storage/memory, this could provide a platform and route for malware to access all machines on the specific network.

I would greatly appreciate any advice on the specific area of network security, and if anybody could point me towards any literature on this subject.


Thanks in advance,

I