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文件上传20个绕过方法（upload-labs）

验证的几个点：后缀名，类型，文件头

Pass-01

积累函数


$_POST['submit'] 是不是提交按钮`

isset($_POST["Submit"])  是否通过按钮来提交

move_uploaded_file() 函数把上传的文件移动到新位置
move_uploaded_file(file,newloc)

Document:getElementsByName(name)
返回带有指定名称的对象的集合。
（说明：document.getElementsByName, document.getElementsByTagName, document.formName.elements 这类方法所得到的结果都是集合.用于批量更新时的数据传递.）

document.getElementsbyname(name)[0].value
document.getElementsbyname(name)的意思就是获取当前页面上指定name名称的对象集合，就是说你页面上有可能不止一个叫name的对象，所以[0]就是获取第一个


lastIndexOf()方法可以返回某个子字符串在字符串中最后出现的位置

str.lastIndexOf('a',6)的6代表从下标为6的位置向前查找a最后出现的位置


substring（）是用来截取字符串的，根据参数的个数不同，方法含义也不同
 
substring(0,2)这个只含开头不含结尾，因此截取是截取两个字符，从第一个到第二个字符，不包含第三个。

substring(2)这个表示截掉前两个，得到后边的新字符串

indexOf函数在字符串中搜索指定的字符，如果存在，则返回该位置。
基本程序如下
String.indexOf( 检索的字符[, 检索开始的位置])
使用indexOf搜索字符串

$_FILES数组的使用

当客户端提交后，我们获得了一个$_FILES 数组
$_FILES[‘upload_file’][‘tmp_name’];
$_FILES数组内容如下:
$_FILES[‘myFile’][‘name’] 客户端文件的原名称。
$_FILES[‘myFile’][‘type’] 文件的 MIME 类型，需要浏览器提供该信息的支持，例如"image/gif"。
$_FILES[‘myFile’][‘size’] 已上传文件的大小，单位为字节。
$_FILES[‘myFile’][‘tmp_name’] 文件被上传后在服务端储存的临时文件名，一般是系统默认。可以在php.ini的upload_tmp_dir 指定，但用 putenv() 函数设置是不起作用的。
$_FILES[‘myFile’][‘error’] 和该文件上传相关的错误代码。[‘error’] 是在 PHP 4.2.0 版本中增加的。下面是它的说明：(它们在PHP3.0以后成了常量)


<script type="text/javascript">
    function checkFile() {
        var file = document.getElementsByName(' ')[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;
        }
    }
</script>

简单白名单验证

shiyig
是一个前端验证
直接修改后缀就可以啦

pass-02


$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 . '/' . $_FILES['                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                 ']['name'];          
            if (move_uploaded_file($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！';
    }
}

在这里插入图片描述
第一种：抓包修改后缀

修改后缀是先把php后门修改成允许上传的文件类型，再抓包修改成php，不要修改错误

第二种：直接上传php类型文件，然后抓包修改

修改Content-Type:
Content-Type: image/png

在这里插入图片描述

bingo！！！！

pass-03
积累函数
PHP中的trim函数的用法：【trim()】函数是php中的内置函数，用于删除字符串左右两边的空格或预定义字符，并返回修改后的字符串，函数语法为：【trim($string, $charlist)】。

参数：trim() 函数接受一个必需参数和一个可选参数

$string：用于指定要从中删除空白和左右预定义字符的字符串；必需参数，不可省略。

$charlist：用于指定要从字符串中删除的字符。可选参数，可省略；如果省略了，则将删除以下所有字符：

●　“\ 0” - NULL

●　“\ t” - 标签

●　“\ n” - 新行

●　“\ x0B” - 垂直制表符

●　“\ r” - 回车

●　“” - 普通的白色空间

返回值：它通过删除空格以及左右字符串两侧的预定义字符来返回修改后的字符串。
在这里插入图片描述

在这里插入图片描述
deldot函数

deldot($file_name); //删除文件名末尾的点

strrchr函数

strrchr() 函数（在php中）查找字符在指定字符串中从右面开始的第一次出现的位置，如果成功，返回该字符以及其后面的字符，如果失败，则返回 NULL。与之相对应的是strchr()函数，它查找字符串中首次出现指定字符以及其后面的字符。

strtolower函数
strtolower($file_ext); //转换为小写

str_ireplace函数
$file_ext = str_ireplace('::$ DATA’, ‘’, $file_ext); //去除字符串::$ DATA


$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！';
    }
}

在这里插入图片描述
是一个黑名单

可以用 phtml，php3，php5，php绕过

pass-04


$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");
        $file_name = trim($_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！';
    }
}

很严谨的黑名单

使用htaccess解析绕过

解析htaccess

通过配置文件（.htaccess)实现文件上传
一·什么是服务器配置文件.htaccess
许多服务器还允许开发人员在各个目录中创建特殊的配置文件，以便覆盖或添加一个或多个全局设置。例如，Apache 服务器将从一个名为（.htaccess如果存在）的文件中加载
特定于目录的配置。Web 服务器使用这些类型的配置文件，但通常不允许您使用 HTTP 请求访问它们。但是，您可能偶尔会发现无法阻止您上传自己的恶意配置文件的服务器在
这种情况下，即使您需要的文件扩展名被列入黑名单，您也可以欺骗服务器将任意自定义文件扩展名映射到可执行的 MIME 类型。
如果当你上传文件的时候发现你的脚本文件被阻止上传，你可以尝试上传.htaccess文件。在.htaccess文件里面将你的文件扩展名映射到可执行MIME类型。只需要添加一句话：
AddType application/x-httpd-php .html（则上传的html文件可以被解析成.php文件去执行）
AddType application/x-httpd-php .txt（则上传的html文件可以被解析成.php文件去执行）

先上传htaccess

<FilesMatch “shell.jpg”>
SetHandler application/x-httpd-php

该句话的意思就是把该文件当成php去执行

再上传后门代码，文件名字为shell.jpg

pass-05

大小写绕过


$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",".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, '.');
        $file_ext = str_ireplace('::$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！';
    }
}
?>

在这里插入图片描述

pass-06
比上一个少了一个收尾去空
首位去空绕过

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 = $_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！';
    }

直接抓包在文件类型后面加上一个空格

在这里插入图片描述

pass-07
少了一个删除文件末尾的.
.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");
        $file_name = trim($_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！';
    }
}
?>

在这里插入图片描述

上传成功

pass-08

:: $D A T A 绕过 Win d o w s 特性（ ::$ DATA）
在window的时候如果文件名+":: $D A T A " 会把 ::$ DATA之后的数据当成文件流处理,不会检测后缀名，（也就是说，会自动过滤掉文件的后缀名)

且保持::$DATA之前的文件名，他的目的就是不检查后缀名

例如:

“shell.php:: $D A T A ", Win d o w s 会自动去掉末尾的 ::$ DATA变成"shell.php”

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
        $file_ext = trim($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！';
    }
}

抓包

在这里插入图片描述

pass-09

混合绕过
将前面的黑名单全部加入进去，挨个删除绕过
先过滤.
再过滤大小写

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！';
    }
}

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