Document Title:
===============
Microsoft Skype Mobile v8.x - Emoticons DoS Vulnerability


References:
===========
https://www.vulnerability-lab.com/get_content.php?id=2117

Video: https://www.youtube.com/watch?v=2vcdQb98zE0

Advisory: https://www.vulnerability-lab.com/get_content.php?id=2116

MSRC ID: 43520  
CRM:0461036906

Acknowledgements: https://technet.microsoft.com/en-us/cc308589

Vulnerability Magazine: https://www.vulnerability-db.com/?q=articles/2018/03/28/lab-researcher-discovered-microsoft-skype-denial-service-vulnerability



Release Date:
=============
2018-03-26


Vulnerability Laboratory ID (VL-ID):
====================================
2117


Common Vulnerability Scoring System:
====================================
4.7


Vulnerability Class:
====================
Denial of Service


Vulnerability Disclosure Timeline:
==================================
2018-02-01: Researcher Notification & Coordination (Security Researcher)
2018-02-03: Vendor Notification (Microsoft Security Response Center)
2018-02-08: Vendor Response/Feedback (Microsoft Security Response Center)
2018-03-20: Vendor Fix/Patch (Microsoft Service Developer Team)
2018-03-25: Vendor Fix/Patch (Security Acknowledgements)
2018-03-27: Public Disclosure (Vulnerability Laboratory)


Discovery Status:
=================
Published


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


Severity Level:
===============
Medium


Authentication Type:
====================
Restricted Authentication (Guest Privileges)


User Interaction:
=================
No User Interaction


Disclosure Type:
================
Coordinated Disclosure


Technical Details & Description:
================================
The video demonstrates a denial of service vulnerability that is exploitable in the nest microsoft skype software client for android and ios.
The vulnerability allows to send malformed contents with a rendering issue to crash other clients on message arrival.
The denial of service occurs because of a corruption when rendering the smilies submitted through a multi user platform.


Credits & Authors:
==================
Benjamin Kunz Mejri [research@vulnerability-lab.com] - https://www.vulnerability-lab.com/show.php?user=Benjamin+K.M.


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