Vulnerabilities in Microsoft Font Drivers Could Allow Remote Code Execution (MS15-044)

ITS Advisory Number: 
2015-053
Date(s) Issued: 
Tuesday, May 12, 2015
Subject: 
Vulnerabilities in Microsoft Font Drivers Could Allow Remote Code Execution (MS15-044)
Overview: 

Vulnerabilities have been discovered in Microsoft Windows, Microsoft .NET Framework, Microsoft Office, Microsoft Lync, and Microsoft Silverlight, which could result in remote code execution. These vulnerabilities can be exploited if a user visits an untrusted webpage that contains embedded TrueType fonts.  An attacker who successfully exploits these vulnerabilities could gain the same user rights as the current user. Depending on the privileges associated with the user, an attacker could install programs; view, change, or delete data; or create new accounts with full user rights.

Systems Affected: 
  • Windows Server 2003
  • Windows Vista
  • Windows 7
  • Windows Server 2008
  • Windows Server 2008 R2
  • Windows 8
  • Windows 8.1
  • Windows Server 2012
  • Windows Server 2012 R2
RISK
GOVERNMENT
Large and medium government entities: 
High
Small government entities: 
High
BUSINESS
Large and medium business entities: 
High
Small business entities: 
High
Home Users: 
High
Description: 

The following vulnerabilities exist in Microsoft Windows, Microsoft .NET Framework, Microsoft Office, Microsoft Lync, and Microsoft Silverlight in a way:

  • When the Windows DirectWrite library improperly handles OpenType fonts. [CVE-2015-1670]
  • When components of Windows, .NET Framework, Office, Lync, and Silverlight fail to properly handle TrueType fonts. [CVE-2015-1671

An attacker who successfully exploits these vulnerabilities could gain the same user rights as the current user. Depending on the privileges associated with the user, an attacker could install programs; view, change, or delete data; or create new accounts with full user rights.

Actions: 

We recommend the following actions be taken:

  • Apply appropriate patches provided by Microsoft to vulnerable systems immediately after appropriate testing.
  • Run all software as a non-privileged user (one without administrative privileges) to diminish the effects of a successful attack.
  • Do not open email attachments from unknown or untrusted sources or suspicious emails from trusted sources.
  • Remind users not to visit un-trusted websites or follow links provided by unknown or un-trusted sources.