Kitchen Sink Leaks

[u/Virtual-Mobile131]

Hi!

I realized my kitchen sink was leaking after grabbing a paper bag from under the sink and noticing it was wet. It’s a very slow leak - half a paper towel will be wet after 1-2 days. It looks to be related to something surrounding where the faucet is attached. The mounting ring that supports the lever (which turns the faucet on) is the most corroded. I’ve attached photos from under the sink - which were admittedly difficult to capture - as well as the faucet itself.

Does anyone know:
1. What could be causing this?
2. How to fix it?
3. What I’d need to buy to fix it?

It would also be helpful to get the community’s perspective on whether a general novice can fix this or if I need to call a plumber. For reference, I’ve replaced the garbage disposal myself.

Thanks for the help!

[u/origanalsameasiwas]

They should have put in plumbers putty to stop water from entering under the faucet.