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Check Point Advisories

Microsoft Skype for Business Denial of Service (CVE-2018-8546)

Check Point Reference: CPAI-2018-1165
Date Published: 26 Nov 2018
Severity: High
Last Updated: 2 Sep 2021
Industry Reference:CVE-2018-8546
Protection Provided by:

Security Gateway
R80, R77, R75

Who is Vulnerable? Microsoft Lync Basic 2013 Service Pack 1
Microsoft Lync 2013 Service Pack 1
Microsoft Skype for Business Basic 2016
Microsoft Skype for Business 2016
Vulnerability Description A denial of service vulnerability exists in Microsoft Skype for Business and Lync. The vulnerability is due to improper handling of emojis. Successful exploitation may lead to denial of service conditions.

Protection Overview

This protection detects attempts to exploit this vulnerability.

In order for the protection to be activated, update your Security Gateway product to the latest IPS update. For information on how to update IPS, go to SBP-2006-05, click on Protection tab and select the version of your choice.

Security Gateway R80 / R77 / R75

  1. In the IPS tab, click Protections and find the Microsoft Skype for Business Denial of Service (CVE-2018-8546) protection using the Search tool and Edit the protection's settings.
  2. Install policy on all Security Gateways.

This protection's log will contain the following information:

Attack Name:  Application Servers Protection Violation.
Attack Information:  Microsoft Skype for Business Denial of Service (CVE-2018-8546)

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