CVE-2017-11786: Critical severity Microsoft Lync vulnerability

Published Oct 13, 2017

Updated

Skype for Business in Microsoft Lync 2013 SP1 and Skype for Business 2016 allows an attacker to steal an authentication hash that can be reused elsewhere, due to how Skype for Business handles authentication requests, aka "Skype for Business Elevation of Privilege Vulnerability."

Affected Software

2 affected components

Microsoft Lync=2013-sp1

Microsoft Skype for Business=2016

Remediation

Patch Available

https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2017-11786

Event History

Oct 13, 2017

CVE Published

via MITRE·01:00 PM

Data Sourced

via MITRE·01:00 PM

DescriptionWeakness

Frequently Asked Questions

What is the severity of CVE-2017-11786?

CVE-2017-11786 is rated as important, emphasizing the potential impact on authentication security.

How do I fix CVE-2017-11786?

To mitigate CVE-2017-11786, update to the latest version of Microsoft Lync 2013 SP1 or Skype for Business 2016.

What types of systems are affected by CVE-2017-11786?

CVE-2017-11786 affects Microsoft Lync 2013 SP1 and Skype for Business 2016.

What does CVE-2017-11786 exploit?

CVE-2017-11786 exploits the way Skype for Business handles authentication requests, potentially allowing an attacker to steal an authentication hash.

Is CVE-2017-11786 a remote vulnerability?

CVE-2017-11786 can be exploited remotely, making it critical to apply security updates promptly.