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[SWPUCTF 2018]SimplePHP

news 2026/5/11 17:41:29

1.打开是一个上传页面

有一个上传文件功能和查看文件功能

分别打开看一下

upload_file.php

file.php

感觉这个查看文件这个页面可以进行任意文件读取，使用bp抓包看一下

发现可以读取

2.查看文件代码

upload_file.php

<?php include 'function.php'; upload_file(); ?> <html> <head> <meta charest="utf-8"> <title>文件上传</title> </head> <body> <div align = "center"> <h1>前端写得很low,请各位师傅见谅!</h1> </div> <style> p{ margin:0 auto} </style> <div> <form action="upload_file.php" method="post" enctype="multipart/form-data"> <label for="file">文件名:</label> <input type="file" name="file" id="file"><br> <input type="submit" name="submit" value="提交"> </div> </script> </body> </html>

function.php

<?php //show_source(__FILE__); include "base.php"; header("Content-type: text/html;charset=utf-8"); error_reporting(0); function upload_file_do() { global $_FILES; $filename = md5($_FILES["file"]["name"].$_SERVER["REMOTE_ADDR"]).".jpg"; //mkdir("upload",0777); if(file_exists("upload/" . $filename)) { unlink($filename); } move_uploaded_file($_FILES["file"]["tmp_name"],"upload/" . $filename); echo '<script type="text/javascript">alert("上传成功!");</script>'; } function upload_file() { global $_FILES; if(upload_file_check()) { upload_file_do(); } } function upload_file_check() { global $_FILES; $allowed_types = array("gif","jpeg","jpg","png"); $temp = explode(".",$_FILES["file"]["name"]); $extension = end($temp); if(empty($extension)) { //echo "<h4>请选择上传的文件:" . "<h4/>"; } else{ if(in_array($extension,$allowed_types)) { return true; } else { echo '<script type="text/javascript">alert("Invalid file!");</script>'; return false; } } } ?>

base.php

<?php session_start(); ?> <!DOCTYPE html> <html> <head> <meta charset="utf-8"> <title>web3</title> <link rel="stylesheet" href="https://cdn.staticfile.org/twitter-bootstrap/3.3.7/css/bootstrap.min.css"> <script src="https://cdn.staticfile.org/jquery/2.1.1/jquery.min.js"></script> <script src="https://cdn.staticfile.org/twitter-bootstrap/3.3.7/js/bootstrap.min.js"></script> </head> <body> <nav class="navbar navbar-default" role="navigation"> <div class="container-fluid"> <div class="navbar-header"> <a class="navbar-brand" href="index.php">首页</a> </div> <ul class="nav navbar-nav navbra-toggle"> <li class="active"><a href="file.php?file=">查看文件</a></li> <li><a href="upload_file.php">上传文件</a></li> </ul> <ul class="nav navbar-nav navbar-right"> <li><a href="index.php"><span class="glyphicon glyphicon-user"></span><?php echo $_SERVER['REMOTE_ADDR'];?></a></li> </ul> </div> </nav> </body> </html> <!--flag is in f1ag.php-->

file.php

<?php header("content-type:text/html;charset=utf-8"); include 'function.php'; include 'class.php'; ini_set('open_basedir','/var/www/html/'); $file = $_GET["file"] ? $_GET['file'] : ""; if(empty($file)) { echo "<h2>There is no file to show!<h2/>"; } $show = new Show(); if(file_exists($file)) { $show->source = $file; $show->_show(); } else if (!empty($file)){ die('file doesn\'t exists.'); } ?>

然后再看一下经常出现的class.php有没有

class.php

<?php class C1e4r { public $test; public $str; public function __construct($name) { $this->str = $name; } public function __destruct() { $this->test = $this->str; echo $this->test; } } class Show { public $source; public $str; public function __construct($file) { $this->source = $file; //$this->source = phar://phar.jpg echo $this->source; } public function __toString() { $content = $this->str['str']->source; return $content; } public function __set($key,$value) { $this->$key = $value; } public function _show() { if(preg_match('/http|https|file:|gopher|dict|\.\.|f1ag/i',$this->source)) { die('hacker!'); } else { highlight_file($this->source); } } public function __wakeup() { if(preg_match("/http|https|file:|gopher|dict|\.\./i", $this->source)) { echo "hacker~"; $this->source = "index.php"; } } } class Test { public $file; public $params; public function __construct() { $this->params = array(); } public function __get($key) { return $this->get($key); } public function get($key) { if(isset($this->params[$key])) { $value = $this->params[$key]; } else { $value = "index.php"; } return $this->file_get($value); } public function file_get($value) { $text = base64_encode(file_get_contents($value)); return $text; } } ?>