upload-labs

直接下载放到phpstudy打开即可。

第一关

查看源码，可以看到js代码定义了一个checkFile函数来对上传的文件进行后缀检查，只允许上传jpg、png、gif文件。

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;

    }

}

直接在浏览器里面禁用javascript代码即可绕过


或者使用bp截获数据包进行修改

第二关

查看源码

$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！';

    }

}

可以看到这次是对文件MIME类型做了限制，直接在BURP里面修改绕过。

第三关

先看代码,过滤了常见后缀名，大小写也被转换为小写，也过滤了::$DATA，而且文件名会随机生成导致.htaccess也用不了，所以这关就是其他能够解析代码的后缀名。

常见的后缀名替换

php：php3、php5、phtml、pth、phps

aspx：ashx、asmx、ascx

jsp：jspx、jtml

asp：cer、asa


$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！';

    }

}

要在自己的apache的httpd.conf文件找到application/x-httpd-php这串代码去掉注释即可。

第四关

查看代码，依旧是黑名单过滤把常见的解析方式全部过滤掉了。

$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！';

    }

}

没有对上传的文件重命名，我们可以上传htaccess文件来绕过

写入代码，把所有文件当做php文件来执行

SetHandler application/x-httpd-php

再次上传一个1.jpg文件


第五关

查看代码跟第四关过滤大致相同，但是过滤了.htaccess文件。同时会删掉文件名末尾的点，把大写替换为小写，文件名开头和尾部的空格也被去掉，而且去除字符串::$DATA。查看代码逻辑是只走了一遍，我们可以使用点空格点来绕过，这样他走完过滤之后还剩下一个点。

$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！';

    }

}


第六关

可以看到这一关没有进行大小写过滤，我们直接使用大小写绕过即可。

$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！';

    }

}

第七关

直接在文件名后面加入空格绕过。

$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！';

    }

}

第八关

加点绕过。

$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！';

    }

}

第九关

使用::$DATA绕过。在window中如果文件名+::$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，他的目的就是不检查后缀名

$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！';

    }

}

第十关

绕过方式和第五关相同。

$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！';

    }

}

第十一关

这一关是会删掉黑名单的域名后缀，我们可以使用双写绕过。

$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","jsp","jspa","jspx","jsw","jsv","jspf","jtml","asp","aspx","asa","asax","ascx","ashx","asmx","cer","swf","htaccess","ini");

        $file_name = trim($_FILES['upload_file']['name']);

        $file_name = str_ireplace($deny_ext,"", $file_name);

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

    }

}

第十二关

这一关是白名单，我们可以使用%00截断来绕过，%00只能用于php版本低于5.3的。把phpstudy切换一下版本,把magic_quotes_gpc关闭。

$is_upload = false;

$msg = null;

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

    $ext_arr = array('jpg','png','gif');

    $file_ext = substr($_FILES['upload_file']['name'],strrpos($_FILES['upload_file']['name'],".")+1);

    if(in_array($file_ext,$ext_arr)){

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

        $img_path = $_GET['save_path']."/".rand(10, 99).date("YmdHis").".".$file_ext;

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

            $is_upload = true;

        } else {

            $msg = '上传出错！';

        }

    } else{

        $msg = "只允许上传.jpg|.png|.gif类型文件！";

    }

}

第十三关

这一关依然是白名单，使用%00截断绕过。

$is_upload = false;

$msg = null;

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

    $ext_arr = array('jpg','png','gif');

    $file_ext = substr($_FILES['upload_file']['name'],strrpos($_FILES['upload_file']['name'],".")+1);

    if(in_array($file_ext,$ext_arr)){

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

        $img_path = $_POST['save_path']."/".rand(10, 99).date("YmdHis").".".$file_ext;

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

            $is_upload = true;

        } else {

            $msg = "上传失败";

        }

    } else {

        $msg = "只允许上传.jpg|.png|.gif类型文件！";

    }

}

第十四关

图片马制作copy tu1.jpg /b + ma.php /a tu2.jpg

function getReailFileType($filename){

    $file = fopen($filename, "rb");

    $bin = fread($file, 2); //只读2字节

    fclose($file);

    $strInfo = @unpack("C2chars", $bin);

    $typeCode = intval($strInfo['chars1'].$strInfo['chars2']);

    $fileType = '';

    switch($typeCode){

        case 255216:

            $fileType = 'jpg';

            break;

        case 13780:

            $fileType = 'png';

            break;

        case 7173:

            $fileType = 'gif';

            break;

        default:

            $fileType = 'unknown';

        }

        return $fileType;

}

$is_upload = false;

$msg = null;

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

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

    $file_type = getReailFileType($temp_file);

    if($file_type == 'unknown'){

        $msg = "文件未知，上传失败！";

    }else{

        $img_path = UPLOAD_PATH."/".rand(10, 99).date("YmdHis").".".$file_type;

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

            $is_upload = true;

        } else {

            $msg = "上传出错！";

        }

    }

}

上传图片马使用文件包含

第十五关

跟第十四关相同，但是这关使用了getimagesize函数来检查是否为正常图片，第十四关只检查了文件头是否为正常图片。制作图片马绕过即可
图片马制作copy tu1.jpg /b + ma.php /a tu2.jpg

第十六关

第16关同14，15关思路一样，操作一样。但是需要打开php_exif，打开phpstudy的其他选项菜单—PHP扩展及设置—PHP扩展。

第十七关

第十七关主要是把二次渲染绕过
imagecreatefromjpeg（）函数
二次渲染是由Gif文件或 URL 创建一个新图象。成功则返回一图像标识符/图像资源，失败则返回false，导致图片马的数据丢失，上传图片马失败。
进行通关
按照原来的方法进行上传，我们可以发现还是可以上传的，但是配合包含漏洞却无法解析，这时我们把上传的图片复制下来用Notepad打开，发现我们原来写的php代码没有了，这就是二次渲染把我们里面的php代码删掉了。
我们
把原图和他修改过的图片进行比较，看看哪个部分没有被修改。将php代码放到没有被更改的部分，配合包含漏洞，就可以了。
使用HxD Hex Editor进行比较
具体实现需要自己编写Python程序，人工尝试基本是不可能构造出能绕过渲染函数的图片webshell的，知道怎么解就可以了。

第十八关

第十八关主要是对条件竞争的考察，我们看代码他是先将图片上传上去，才开始进行判断后缀名、二次渲染。如果我们在上传上去的一瞬间访问这个文件，那他就不能对这个文件删除、二次渲染。这就相当于我们打开了一个文件，然后再去删除这个文件，就会提示这个文件在另一程序中打开无法删除。

备考下一个证书

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