This cannot be good... I'm in the midwest, and my 2017 forester I bought last summer was parked outside for the past winter. I don't know how much corrosion there was before I owned it because I either never thought to check or didn't notice if I did... What should I do now? These photos were...

2010 Automatic with 130000 miles. Just noticed some corrosion on the power steering lines. Have a look here. I'm wondering how much to worry about this. And if I need to get this replaced, how hard is it to do myself. TIA!