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前言

此文章只用于学习和反思巩固文件上传漏洞知识，禁止用于做非法攻击。注意靶场是可以练习的平台，不能随意去尚未授权的网站做渗透测试！！！

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一、回顾前几关知识点

前几关我们都利用win特性，点、空格、大小写以及data流绕过。这一关也是利用win特性，用点加空格组合绕过，和第五关方法一样。不明白的看我的第四关讲解。

二、靶场第十关通关思路

• 1、看源代码
• 2、bp抓包绕过
• 3、检查文件是否成功上传

1、看源代码

$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");
        $file_name = trim($_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); //首尾去空
        
        if (!in_array($file_ext, $deny_ext)) {
            $temp_file = $_FILES['upload_file']['tmp_name'];
            $img_path = UPLOAD_PATH.'/'.$file_name;
            if (move_uploaded_file($temp_file, $img_path)) {
                $is_upload = true;
            } else {
                $msg = '上传出错！';
            }
        } else {
            $msg = '此文件类型不允许上传！';
        }
    } else {
        $msg = UPLOAD_PATH . '文件夹不存在,请手工创建！';
    }
}

从源代码看出，这一次是都验证了，不能用前几关的方法了。但是这一关源代码和第五关差不多。由于删除点和首尾去空这些验证只是一次性，所以我们可以进行点和空格绕过。

2、bp抓包绕过

这里我们上传1.php文件，然后bp抓包修改为1.php. .这里是点+空格+点。

3、检查文件是否成功上传

发现上传成功，如果是上传一句话木马就可以连接菜刀了。如果不懂原理可以看我第四关讲解。

总结

这一关利用后端验证只验证了一次和win特性来绕过。此文章是小白自己为了巩固文件上传漏洞而写的，大佬路过请多指教！