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corstest.py
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corstest.py
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#!/usr/bin/env python3
# -*- coding: utf-8 -*-
# python standard library
import re, sys, ssl, signal
import argparse, multiprocessing
from urllib.parse import urlparse
import urllib.request
import logging
timeoutValue = 1000
# -------------------------------------------------------------------------------------------------
def usage():
parser = argparse.ArgumentParser(description="Simple CORS misconfigurations checker")
parser.add_argument("infile", help="File with domain or URL list")
parser.add_argument("-c", metavar="name=value", help="Send cookie with all requests")
parser.add_argument("-p", metavar="processes", help="multiprocessing (default: 32)")
parser.add_argument("-s", help="always force ssl/tls requests", action="store_true")
parser.add_argument("-q", help="quiet, allow-credentials only", action="store_true")
parser.add_argument("-v", help="produce a more verbose output", action="store_true")
return parser.parse_args()
# -------------------------------------------------------------------------------------------------
args = usage()
def main():
try:
urls = [line.rstrip() for line in open(args.infile)]
procs = min(abs(int(args.p or 32)), len(urls)) or 1
except (IOError, ValueError) as e:
print("An error has occured: {}".format(e))
return
# check domains/urls in parallel but clean exit on ctrl-c
sigint_handler = signal.signal(signal.SIGINT, signal.SIG_IGN)
pool = multiprocessing.Pool(processes=procs)
signal.signal(signal.SIGINT, sigint_handler)
try:
pool.map_async(check, urls).get( timeout=timeoutValue )
except KeyboardInterrupt:
pass
# -------------------------------------------------------------------------------------------------
# check for vulns/misconfigurations
def check(url):
logging.debug("[DEBUG - check] url: {}".format(url))
if re.findall("^https://", url):
args.s = True # set protocol
url = re.sub("^https?://", "", url) # url w/o proto
host = urlparse("//"+url).hostname or "" # set hostname
acao = cors(url, url, False, True) # perform request
logging.debug("[DEBUG - check] acao: {}".format(acao))
if acao:
if args.q and (acao == "no_acac" or "*" == acao):
return
if acao == "*":
info(url, "* (without credentials)")
elif acao in ["//", "://"]:
alert(url, "Any origin allowed") # firefox/chrome/safari/opera only
elif re.findall(r"\s|,|\|", acao):
invalid(url, "Multiple values in Access-Control-Allow-Origin")
elif re.findall(r"\*.", acao):
invalid(url, 'Wrong use of wildcard, only single "*" is valid')
elif re.findall(r"fiddle.jshell.net|s.codepen.io", acao):
alert(url, "Developer backdoor")
elif "evil.org" in cors(url, "evil.org"):
alert(url, "Origin reflection")
elif cors(url, url, True).startswith("http://"):
warning(url, "Non-ssl site allowed")
elif "sub."+host in cors(url, "sub."+url):
warning(url, "Arbitrary subdomains allowed")
elif "not"+host in cors(url, "not"+url):
alert(url, "Pre-domain wildcard") if sld(host) else warning(url, "Pre-subdomain wildcard")
elif host+".tk" in cors(url, host+".tk"):
alert(url, "Post-domain wildcard")
elif "null" == cors(url, "null").lower():
alert(url, "Null misconfiguration")
else:
info(url, acao)
elif acao != None and not args.q:
notvuln(url, "Access-Control-Allow-Origin header not present")
# TBD: maybe use CORS preflight options request instead to check if cors protocol is understood
sys.stdout.flush()
# -------------------------------------------------------------------------------------------------
# perform request and fetch response header
def cors(url, origin, ssltest=False, firstrun=False):
url = ("http://" if not (ssltest or args.s) else "https://") + url
logging.debug("[DEBUG - cors] url: {}".format(url))
if origin != "null":
origin = ("http://" if (ssltest or not args.s) else "https://") + origin
logging.debug("[DEBUG - cors] origin: {}".format(origin))
try:
request = urllib.request.Request(url)
logging.debug("[DEBUG - cors] request: {}".format(request))
request.add_header('Origin', origin)
request.add_header('Cookie', args.c or "")
request.add_header('User-Agent', 'Mozilla/5.0 (Windows NT 6.1; WOW64)')
if not "_create_unverified_context" in dir(ssl):
response = urllib.request.urlopen(request, timeout=10)
else:
response = urllib.request.urlopen(request, timeout=10, context=ssl._create_unverified_context())
logging.debug("[DEBUG - cors] response: {}".format(response))
response_info = response.info()
logging.debug("[DEBUG - cors] response_info: {}".format(response_info))
acao = response.getheader('Access-Control-Allow-Origin')
acac = str(response.getheader('Access-Control-Allow-Credentials')).lower() == "true"
vary = "Origin" in str(response.getheader('Vary'))
logging.debug("[DEBUG - cors] acao: {}, acac: {}, vary: {}".format(acao, acac, vary))
if args.v:
print("%s\n%-10s%s\n%-10s%s\n%-10s%s\n%-10s%s" % ("-" * 72, "Resource:", response.geturl(), "Origin:", origin, "ACAO:", acao or "-", "ACAC:", acac or "-"))
if firstrun:
if args.q and not acac:
acao = "no_acac"
if acac and acao != '*' and not args.q:
alert(url, "Access-Control-Allow-Credentials present")
if vary and not args.q:
warning(url, "Access-Control-Allow-Origin dynamically generated")
if ssltest and response.getheader('Strict-Transport-Security'):
acao = ""
return (acao or "") if acac else ""
except Exception as e:
logging.debug("[DEBUG - cors] e: {}".format(e))
if not args.q:
error(url, e or str(e).splitlines()[-1])
if not firstrun:
return ""
# -------------------------------------------------------------------------------------------------
# check if given hostname is a second-level domain
def sld(host):
try:
with open('tldlist.dat') as f:
tlds = [line.strip() for line in f if line[0] not in "/\n"][::-1]
except IOError as e:
logging.debug("[DEBUG - sld]: e: {}".format(e))
return True
for tld in tlds:
if host.endswith('.' + tld): host = host[:-len(tld)]
if host.count('.') == 1: return True
# -------------------------------------------------------------------------------------------------
def error(url, msg): print("\x1b[2m{} - Error: {}\x1b[0m".format( url, msg))
def alert(url, msg): print("\x1b[97;41m{} - Alert: {}\x1b[0m".format(url, msg))
def invalid(url, msg): print("\x1b[30;43m{} - Invalid: {}\x1b[0m".format(url, msg))
def warning(url, msg): print("\x1b[30;48;5;202m{} - Warning: {}\x1b[0m".format(url, msg))
def notvuln(url, msg): print("\x1b[97;100m{} - Not vulnerable: {}\x1b[0m".format(url, msg))
def info(url, msg): print("\x1b[30;42m{} - Access-Control-Allow-Origin: {}\x1b[0m".format(url, msg))
# -------------------------------------------------------------------------------------------------
if __name__ == '__main__':
main()