There are lots of fixes for this one. I personally prefer to use a broomstick/socket wrench/whatever you have in the approximate size of the leg. Insert that into the leg and use it to reshape the leg from the inside.
Some other options:
-Wrap legs with Aluminum HVAC tape
-Wrap legs/shim legs with aluminum foil
-Shim leg sockets by sliding a small nail between the leg and socket
-Drill and add screws to the legs (my least favorite by far)
Good luck!