The photos might be deceiving, but it looks like an ABS p-trap to a non-existant fixture? If it is clogged up and leaking, there must be a stoppage below that union.
If there is not a clean out directly above or below the tee, I would say, go ahead and get yourself some ABS glue and an ABS coupling. Cut open the pipe and snake it out. Then glue it back together.
P Trap clogged
Linear Mode
