upload-labs靶场-Pass-04关-思路以及过程

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

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

通关过程:

这关应该考的是 Apache服务器的.htaccess文件,这个文件是Apache服务器用来进行伪静态的配置文件吧
看上面的代码可以看出,.htaccess文件是没有被禁止上传的,可以先把这个文件上传到服务器上

.htaccess文件上传成功后再上传一个符合格式的脚本文件,把准备好的PHP扩展名改成图片格式

执行脚本成功,通关完成!