Vulnerability in Microsoft DNS Server Could Allow for Remote Code Execution (MS16-071)

ITS Advisory Number: 
2016-105
Date(s) Issued: 
Tuesday, June 14, 2016
Subject: 
Vulnerability in Microsoft DNS Server Could Allow for Remote Code Execution (MS16-071)
Overview: 

A vulnerability has been discovered in Microsoft's Windows Domain Name System (DNS) Server, which could allow for remote code execution. An attacker who successfully exploited this vulnerability could execute arbitrary code in the context of the Local System Account. Depending on the privileges associated with this account, an attacker could then install programs; view, change, or delete data; or create new accounts with full user rights.

Systems Affected: 
  • Microsoft Windows Server 2012
  • Microsoft Windows Server 2012 R2
  • Microsoft Windows Server 2012 (Server Core Installation)
  • Microsoft Windows Server 2012 R2 (Server Core Installation)
RISK
GOVERNMENT
Large and medium government entities: 
High
Small government entities: 
Medium
BUSINESS
Large and medium business entities: 
High
Small business entities: 
Medium
Home Users: 
Low
Description: 

A remote code execution vulnerability was discovered in Windows DNS Server when it fails to properly handle specially crafted DNS requests (CVE-2016-3227). This vulnerability can be exploited if an attacker issues a malicious request to a vulnerable Windows server configured as a DNS server.

Successful exploitation of this vulnerability could result in an attacker gaining the same privileges as the Local System Account. Depending on the privileges associated with this account, an attacker could then install programs; view, change, or delete data; or create new accounts with full user rights.

Actions: 
  • After appropriate testing, apply appropriate updates provided by Microsoft to vulnerable systems
  • Run all software as a non-privileged user (one without administrative privileges) to diminish the effects of a successful attack.
  • Remind users not to visit un-trusted websites or follow links provided by unknown or un-trusted sources.
  • Inform and educate users regarding the threats posed by hypertext links contained in emails or attachments especially from un-trusted sources.