Microsoft Exchange Open Redirect

`[+] Credits: John Page (aka hyp3rlinx)   
[+] Website: hyp3rlinx.altervista.org  
[+] Source: http://hyp3rlinx.altervista.org/advisories/MICROSOFT-EXCHANGE-SERVER-OPEN-REDIRECT-CVE-2016-3378.txt  
[+] ISR: Apparition Security   
  
  
  
Vendor:  
=================  
www.microsoft.com  
  
  
  
Product:  
===========  
Microsoft Exchange Server  
  
  
  
Vulnerability Type:  
===================  
Open redirect  
  
  
  
CVE Reference:  
==============  
CVE-2016-3378  
MS16-108  
  
  
  
Security Issue:  
================  
Microsoft Exchange Server is vulnerable to Open redirect allowing attackers who either send a link or pop a web page in a new window  
the possibility to trick victims to either click "Go back" or the "return to sharepoint link" that will then redirect users to arbitrary  
web sites where attackers can then conduct phishing attacks or trick a user to download malicious executables etc.  
  
  
Vulnerable: Microsoft Exchange Server 2016 Cumulative Update 2  
Microsoft Exchange Server 2016 Cumulative Update 1  
Microsoft Exchange Server 2013 SP1 0  
Microsoft Exchange Server 2013 Cumulative Update 13  
Microsoft Exchange Server 2013 Cumulative Update 12  
  
  
  
References:  
===========  
https://securitytracker.com/id/1036778  
http://www.cve.mitre.org/cgi-bin/cvename.cgi?name=cve-2016-3378  
  
  
  
Exploit/POC:  
=============  
1) access the URL (and login if need be)  
  
2) click the link where says "Go back to the SharePoint site for now" and BOOM!  
  
  
https://outlook.office365.com/ecp/TeamMailbox/NewSharePointTeamMailbox.aspx?exsvurl=0&SPUrl=http%3a%2f%2fhyp3rlinx.altervista.org&Title=Go%20back&SPTMAppUrl=https://outlook.office365.com&realm=https://outlook.office365.com&wa=wsignin1.0  
  
  
  
  
Network Access:  
===============  
Remote  
  
  
  
Severity:  
=========  
Medium  
  
  
  
Disclosure Timeline:  
=============================  
Vendor Notification: December 22, 2015  
Been fixed by MS a long time now...  
March 27, 2018 : Public Disclosure  
  
  
  
[+] Disclaimer  
The information contained within this advisory is supplied "as-is" with no warranties or guarantees of fitness of use or otherwise.  
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 accepts no responsibility  
for any damage caused by the use or misuse of this information. The author prohibits any malicious use of security related information  
or exploits by the author or elsewhere. All content (c).  
  
hyp3rlinx  
`