Pass - 01：

1.尝试上传一个php文件：aaa.php，发现只允许上传某些图片类型，用bp抓包，发现http请求都没通过burp就弹出了不允许上传的提示框，这表明验证点在前端，而不在服务端

2.按F12产看具体JS代码，发现checkFile()函数判断上传文件类型，并在判断函数中添加php或者删掉该函数，或者浏览器禁用js后进行上传

3.上传成功，

关键源码：

function checkFile() {

    var file = document.getElementsByName('upload_file')[0].value;

    if (file == null || file == "") {

        alert("请选择要上传的文件!");

        return false;

    }

    //定义允许上传的文件类型

    var allow_ext = ".jpg|.png|.gif";

    //提取上传文件的类型

    var ext_name = file.substring(file.lastIndexOf("."));

    //判断上传文件类型是否允许上传

    if (allow_ext.indexOf(ext_name + "|") == -1) {

        var errMsg = "该文件不允许上传，请上传" + allow_ext + "类型的文件,当前文件类型为：" + ext_name;

        alert(errMsg);

        return false;

    }

}

Pass - 02：

1.上传一个php文件，显示文件类型不正确，要求重新上传，

2.查看源码，发现只对Content-Type进行了过滤判断，利用Burp Suite修改Content-Type类型为 image/jpeg进行修改绕过，

3.上传成功，

关键源码：

$is_upload = false;

$msg = null;

if (isset($_POST['submit'])) {

    if (file_exists(UPLOAD_PATH)) {

        if (($_FILES['upload_file']['type'] == 'image/jpeg') || ($_FILES['upload_file']['type'] == 'image/png') || ($_FILES['upload_file']['type'] == 'image/gif')) {

            $temp_file = $_FILES['upload_file']['tmp_name'];

            $img_path = UPLOAD_PATH . '/' . $_FILES['upload_file']['name']

            if (move_uploaded_file($temp_file, $img_path)) {

                $is_upload = true;

            } else {

                $msg = '上传出错！';

            }

        } else {

            $msg = '文件类型不正确，请重新上传！';

        }

    } else {

        $msg = UPLOAD_PATH.'文件夹不存在,请手工创建！';

    }

}

Pass - 03：

1.上传一个php文件，上传失败并出现回显，

2.上传aaa.php文件并进行抓包，修改php后缀名，如php5，放行

3.上传成功，

关键源码：

$is_upload = false;

$msg = null;

if (isset($_POST['submit'])) {

    if (file_exists(UPLOAD_PATH)) {

        $deny_ext = array('.asp','.aspx','.php','.jsp');

        $file_name = trim($_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 = '不允许上传.asp,.aspx,.php,.jsp后缀文件！';

        }

    } else {

        $msg = UPLOAD_PATH . '文件夹不存在,请手工创建！';

    }

}

补充：

不允许上传.asp,.aspx,.php,.jsp后缀文件，但是可以上传其他任意后缀。比如说:.phtml .phps .php5 .pht，但如果上传的是.php5这种类型文件的话，如果想要被当成php执行的话，需要有个前提条件，即Apache的httpd.conf有如下配置代码
AddType application/x-httpd-php .php .phtml .phps .php5 .pht

AddType 指令：

AddType 指令

作用：在给定的文件扩展名与特定的内容类型之间建立映射

语法：AddType MIME-type extension [extension] ...

AddType指令在给定的文件扩展名与特定的内容类型之间建立映射关系。MIME-type指明了包含extension扩展名的文件的媒体类型。

AddType 是与类型表相关的，描述的是扩展名与文件类型之间的关系。
此处黑名单没有过滤.htaccess后缀，故此处也可上传.htaccess文件进行绕过。

注: .htaccess文件生效前提条件为1.mod_rewrite模块开启。2.AllowOverride All
.htaccess文件是Apache服务器中的一个配置文件，它负责相关目录下的网页配置。
通过htaccess文件，可以实现：网页301重定向、自定义404错误页面、改变文件扩展名、允许/阻止特定的用户或者目录的访问、禁止目录列表、配置默认文档等功能IIS平台上不存在该文件，该文件默认开启，启用和关闭在httpd.conf文件中配置。
构造.htaccess文件，内容如下:AddType application/x-httpd-php .jpg

这里代码的意思可以让 .jpg后缀名文件格式的文件名以php格式解析，因此达到了可执行的效果。所以我们可以把要上传的php文件的后缀名改为.jpg格式从而绕过

Pass - 04：

1.上传php文件，发现不允许，查看提示，过滤了大部分的文件后缀，

2.利用.htacess绕过，创建以此为后缀的文件并写入以下内容，

SetHandler application/x-httpd-php

3.然后所有文件都会解析为php文件，上传图片马，上传成功，

关键代码：

$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",".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); //收尾去空

        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 = '此文件不允许上传!';

        }

    } else {

        $msg = UPLOAD_PATH . '文件夹不存在,请手工创建！';

    }

}

Pass - 05：

1.上传php文件，上传失败，

2.观察源码发现多了.htacess过滤，但此处代码没有将文件名统一转成小写，故可以通过大小写绕过

3.上传成功

关键代码：

$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");

        $file_name = trim($_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！';

    }

}

Pass - 06：

1.上传php文件，不允许上传，

2.产看源代码，将文件后缀名统一进行了小写转换，但是没有去除文件名首尾的空格。所以此处可以利用windows系统的命名规则进行绕过

Win下xx.jpg[空格] 或xx.jpg.这两类文件都是不允许存在的，若这样命名，windows会默认除去空格或点

此处会删除末尾的点，但是没有去掉末尾的空格，因此上传一个.php[空格]文件即可

3.上传成功

关键代码：

$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, '.');

        $file_ext = str_ireplace('::$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'];

            $img_path = UPLOAD_PATH.'/'.date("YmdHis").rand(1000,9999).$file_ext;

            if (move_uploaded_file($temp_file, $img_path)) {

                $is_upload = true;

            } else {

                $msg = '上传出错！';

            }

        } else {

            $msg = '此文件类型不允许上传！';

        }

    } else {

        $msg = UPLOAD_PATH . '文件夹不存在,请手工创建！';

    }

}

Pass - 07：

1.查看源代码，发现相比于Pass-06代码，加上了首尾去空，但是却少了尾部去点。故和上面Pass-06一样，利用windows文件命名规则绕过。

2.上传成功

关键代码：

$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 = $_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

        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！';

    }

}

Pass - 08：

1.查看源代码，是黑名单过滤，但是没有对后缀名进行去”::$DATA”处理，利用windows特性，可在后缀名中加” ::$DATA”绕过：

2.上传成功

关键代码：

$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']);

        $file_ext = strrchr($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！';

    }

}　

补充：

在php+windows的情况下：如果文件名+"::$DATA"会把::$DATA之后的数据当成文件流处理,不会检测后缀名.且保持"::$DATA"之前的文件名。

Pass - 09：

1.查看源代码，这里的代码逻辑是先删除文件名末尾的点，再进行首尾去空。都只进行一次。故可以构造点空格点进行绕过，也就是后缀名改为aaa.php. .，也是利用了Windows的特性。

（从第三关到第九关，如果目标服务器是windows系统的话，均可用点空格点绕过。）

2.上传成功，

关键代码：

$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

        $file_ext = trim($file_ext); //首尾去空

        if (!in_array($file_ext, $deny_ext)) {

            $temp_file = $_FILES['upload_file']['tmp_name'];

            $img_path = UPLOAD_PATH.'/'.date("YmdHis").rand(1000,9999).$file_ext;

            if (move_uploaded_file($temp_file, $img_path)) {

                $is_upload = true;

            } else {

                $msg = '上传出错！';

            }

        } else {

            $msg = '此文件类型不允许上传！';

        }

    } else {

        $msg = UPLOAD_PATH . '文件夹不存在,请手工创建！';

    }

}

Pass - 10：

同Pass - 09。

关键代码：

$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！';

    }

}

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