Check Point Advisories

Microsoft Network Policy Server RADIUS Denial of Service (MS16-021; CVE-2016-0050)

Vulnerability
Protection

Check Point Reference:	CPAI-2016-0190
Date Published:	9 Mar 2016
Severity:	Critical
Last Updated:	Monday 07 August, 2023
Source:	Microsoft MS16-021
Industry Reference:	CVE-2016-0050
Protection Provided by:	Security Gateway R81, R80, R77, R75
Who is Vulnerable?	Microsoft Windows Server 2008 Microsoft Windows Server 2008 R2 Microsoft Windows Server 2012 Microsoft Windows Server 2012 R2
Vulnerability Description	A denial-of-service vulnerability exists in Microsoft Network Policy Server. The vulnerability is due to improper handling of username strings in RADIUS authentication requests. A remote, unauthenticated attacker could exploit this vulnerability by sending maliciously crafted requests to the Network Policy Server . Successful exploitation could lead to a denial-of-service condition on the target.
Update/Patch Avaliable	Apply patches from: MS16-021

Protection Overview

This protection will detect and block 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 R81 / R80 / R77 / R75

In the IPS tab, click Protections and find the Microsoft Network Policy Server RADIUS Denial of Service (MS16-021) protection using the Search tool and Edit the protection's settings.
Install policy on all Security Gateways.

This protection's log will contain the following information:

Attack Name: Application Servers Protection Violation.
Attack Information: Microsoft Network Policy Server RADIUS Denial of Service (MS16-021)