Oil leaking from exaust

[duelly5566]

I left my truck running over night because of extreme low air temp outside 0-2 degrees, I wanted a warm engine when I worked on replacing the starter, so I got to the truck after it idled for 13 hrs shut the truck off and was working on it when it came time to go under the truck I found oil dripping from the pipe where the flex goes to the hard pipe just above the frame and all over the leaf spring any help would be great 2001 vision E7 427 with 620,000 on it.

Thanks in advance.

Steve