[Koha] Tech consultants worried about the security of a windows server network if linux server with Koha is introduced. . .

Hi everyone, I'm looking for sysadmins who are running Koha on a Debian Linux server on a network that also runs a windows mail server and a mac server. The tech consultants who run our high school's network are fearful that adding a linux server would pose a security risk. Everything that I have read praises linux security on its own but I haven't found resources that discuss security threats between servers. I'll also be posting my question on linux listservs but I wanted to make contact with any sysadmin/librarians who have a network environment closest to our own. If anyone knows of any good websites or books on linux security especially in mixed server environments I would be very grateful. Thanks Koha community!