upload-labs靶场-Pass-04关-思路以及过程

用户9006224

发布于 2022-12-21 09:46:46

1.1K0

开始前的小准备

upload-labs靶场是PHP环境运行的,所以我准备了一个PHP脚本和一张图片 图片好准备,PHP脚本如果不想写的话可以用我的这个获取当前时间的PHP脚本

<?php

header("content-type:text/html;charset=utf-8");

date_default_timezone_set("PRC");//设置时区

echo "当前时间为：";

$today = date("Y-m-d D h:i:s A ");

echo $today;

?>

还需要准备一个.htaccess下面的"脚本"是你上传文件的名称

<FilesMatch "脚本">
SetHandler application/x-httpd-php
</FilesMatch>

图片默认不清楚放大看!!!

Pass-04

$is_upload = false;
$msg = null;
if (isset($_POST['submit'])) {
    if (file_exists(UPLOAD_PATH)) {
        $deny_ext = array(".php",".php5",".php4",".php3",".php2","php1",".html",".htm",".phtml",".pht",".pHp",".pHp5",".pHp4",".pHp3",".pHp2","pHp1",".Html",".Htm",".pHtml",".jsp",".jspa",".jspx",".jsw",".jsv",".jspf",".jtml",".jSp",".jSpx",".jSpa",".jSw",".jSv",".jSpf",".jHtml",".asp",".aspx",".asa",".asax",".ascx",".ashx",".asmx",".cer",".aSp",".aSpx",".aSa",".aSax",".aScx",".aShx",".aSmx",".cEr",".sWf",".swf");
        $file_name = trim($_FILES['upload_file']['name']);
        $file_name = deldot($file_name);//删除文件名末尾的点
        $file_ext = strrchr($file_name, '.');
        $file_ext = strtolower($file_ext); //转换为小写
        $file_ext = str_ireplace('::$DATA', '', $file_ext);//去除字符串::$DATA
        $file_ext = trim($file_ext); //收尾去空

        if (!in_array($file_ext, $deny_ext)) {
            $temp_file = $_FILES['upload_file']['tmp_name'];
            $img_path = UPLOAD_PATH.'/'.date("YmdHis").rand(1000,9999).$file_ext;
            if (move_uploaded_file($temp_file, $img_path)) {
                $is_upload = true;
            } else {
                $msg = '上传出错！';
            }
        } else {
            $msg = '此文件不允许上传!';
        }
    } else {
        $msg = UPLOAD_PATH . '文件夹不存在,请手工创建！';
    }
}

通过代码分析和查看提示可以看到已经基本把脚本文件格式禁止上传了