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前言

此文章只用于學習和反思鞏固文件上傳漏洞知識，禁止用于做非法攻擊。注意靶場是可以練習的平臺，不能隨意去尚未授權(quán)的網(wǎng)站做滲透測試！！！

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一、回顧上一關(guān)知識點

前兩關(guān)是利用window命名文件的后綴名特性，因為window對大小寫不敏感。而且命名后綴名的時候，后綴名加空格或者是后綴名加點都是等效于不加東西的文件。比如1.php+空格也就是1.php

二、靶場第七關(guān)通關(guān)思路

• 1、看源代碼
• 2、空格繞過
• 3、檢查文件是否成功上傳

1、看源代碼

$is_upload = false;
$msg = null;
if (isset($_POST['submit'])) {if (file_exists(UPLOAD_PATH)) {$deny_ext = array(".php",".php5",".php4",".php3",".php2",".html",".htm",".phtml",".pht",".pHp",".pHp5",".pHp4",".pHp3",".pHp2",".Html",".Htm",".pHtml",".jsp",".jspa",".jspx",".jsw",".jsv",".jspf",".jtml",".jSp",".jSpx",".jSpa",".jSw",".jSv",".jSpf",".jHtml",".asp",".aspx",".asa",".asax",".ascx",".ashx",".asmx",".cer",".aSp",".aSpx",".aSa",".aSax",".aScx",".aShx",".aSmx",".cEr",".sWf",".swf",".htaccess",".ini");$file_name = $_FILES['upload_file']['name'];$file_name = deldot($file_name);//刪除文件名末尾的點$file_ext = strrchr($file_name, '.');$file_ext = strtolower($file_ext); //轉(zhuǎn)換為小寫$file_ext = str_ireplace('::$DATA', '', $file_ext);//去除字符串::$DATAif (!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 {$msg = '上傳出錯！';}} else {$msg = '此文件不允許上傳';}} else {$msg = UPLOAD_PATH . '文件夾不存在,請手工創(chuàng)建！';}
}

看到源代碼發(fā)現(xiàn)有了大小寫過濾，上一關(guān)方法不管用了。但是發(fā)現(xiàn)和上一關(guān)不同的是它沒有過濾首尾去空。如果我們上傳1.php （空格）文件的話，是不是就能繞過黑名單了呢？而且還能被win服務(wù)器自動識別為1.php文件

2、空格繞過

這里我上傳123.php文件，然后用bp工具在文件后綴名后加上空格后發(fā)包。

3、檢查文件是否成功上傳

發(fā)現(xiàn)上傳成功，如果是一句話木馬就可以連接菜刀了

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總結(jié)

這一關(guān)和上一關(guān)方法類似，也是利用win特性繞過黑名單達到上傳php文件