uplload 通关纪实 pass10

Posted 安全界 的彭于晏

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这一关是将文件名进行过滤操作后,将文件名拼接在路径后面,所以需要绕过前面的首尾去空以及去点。
这一关黑名单,最后上传路径直接使用文件名进行拼接,而且只对文件名进行 f i l e n a m e = d e l d o t ( file_name = deldot( filename=deldot(file_name)操作去除文件名末尾的点,构造后缀绕过黑名单.

源代码如下:

$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!';
    



先上传一个php文件,并用burpsuite抓包:

然后发送到repeater模块,在php后面加上. .,主要是点+空格+点:

然后连接菜刀:

之后成功访问到:

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