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adminer/CVE-2021-21311/README.md

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+# Adminer Server-side Request Forgery on Error Page of Elasticsearch and ClickHouse (CVE-2021-21311)
+
+[中文版本(Chinese version)](README.zh-cn.md)
+
+Adminer is a tool for managing content in databases developed by PHP. It natively supports MySQL, MariaDB, PostgreSQL, SQLite, MS SQL, Oracle, Elasticsearch and MongoDB.
+
+In adminer from version 4.0.0 and before 4.7.9 there is a server-side request forgery vulnerability on error page of Elasticsearch and ClickHouse. Users of Adminer versions bundling all drivers (e.g. `adminer.php`) are affected. This is fixed in version 4.7.9.
+
+References:
+
+- <https://github.com/vrana/adminer/security/advisories/GHSA-x5r2-hj5c-8jx6>
+- <https://github.com/vrana/adminer/files/5957311/Adminer.SSRF.pdf>
+- <https://github.com/projectdiscovery/nuclei-templates/blob/main/http/cves/2021/CVE-2021-21311.yaml>
+
+## Vulnerable environment
+
+Execute following command to start a PHP server with Adminer 4.7.8:
+
+```
+docker compose up -d
+```
+
+After the server is started, you can see the login page of Adminer at `http://your-ip:8080`.
+
+## Exploit
+
+Select the ElasticSearch as the system field, then input `example.com` into the server field. Click the login button, you will see the 400 response from `example.com`:
+
+![](1.png)

adminer/CVE-2021-21311/README.zh-cn.md

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+# Adminer ElasticSearch 和 ClickHouse 错误页面SSRF漏洞（CVE-2021-21311）
+
+Adminer是一个PHP编写的开源数据库管理工具，支持MySQL、MariaDB、PostgreSQL、SQLite、MS SQL、Oracle、Elasticsearch、MongoDB等数据库。
+
+在其4.0.0到4.7.9版本之间，连接 ElasticSearch 和 ClickHouse 数据库时存在一处服务端请求伪造漏洞（SSRF）。
+
+参考连接：
+
+- <https://github.com/vrana/adminer/security/advisories/GHSA-x5r2-hj5c-8jx6>
+- <https://github.com/vrana/adminer/files/5957311/Adminer.SSRF.pdf>
+- <https://github.com/projectdiscovery/nuclei-templates/blob/main/http/cves/2021/CVE-2021-21311.yaml>
+
+## 漏洞环境
+
+执行如下命令启动一个安装了Adminer 4.7.8的PHP服务：
+
+```
+docker compose up -d
+```
+
+服务启动后，在`http://your-ip:8080`即可查看到Adminer的登录页面。
+
+## 漏洞复现
+
+在Adminer登录页面，选择ElasticSearch作为系统目标，并在server字段填写`example.com`，点击登录即可看到`example.com`返回的400错误页面展示在页面中：
+
+![](1.png)

adminer/CVE-2021-21311/docker-compose.yml

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+version: '2'
+services:
+ web:
+   image: vulhub/adminer:4.7.8
+   ports:
+    - "8080:80"