The "warchall live_rce" was probably unsolveable with such generic serialization.
However my plumb attempt to create something turned out to be liked by a few, and there sprung two new challs from it.
LIVE_RCE is now created by
phiber and crafted by
nurfed and solveable, but about a complete different flaw than intended. Nothing unqiue/is well known but great playground.
The old serialization challenge also is back.
nurfed created the env and tested it to present a solveable challenge that probably got patched in php as well:
NURXXED is ready to get solved.
I am sure they both wish you Happy Challenging!