I need to install a computer in a remote location, so that a specific unique user can remotely connect to it via Wireguard VPN. Performance requirements are very low, but security requirements are very high (needs to be very secure against remote attacks).
I could either buy a new computer, but I have an old Dell XPS420 (2.4GHz Intel Core 2 Quad Q6600) lying around, and I'm wondering if I could reuse that.
I can install an up-to-date Linux distro, and setup tight security on the wireguard server, so that part should be fine. What other vulnerability, beyond the OS, should I consider? The only other one I can think of is the BIOS.
I believe the only BIOS Dell makes available is the A07, from 2009. Does it present vulnerabilities that can be exploited remotely?
If yes, I will change the motherboard, but reuse all other pieces. Is it reasonable?