1. /
  2. Security Response/
  3. Microsoft Windows Kernel TrueType Font Parsing (CVE-2011-2004) Denial of Service Vulnerability

Microsoft Windows Kernel TrueType Font Parsing (CVE-2011-2004) Denial of Service Vulnerability

Risk

Medium

Date Discovered

November 8, 2011

Description

Microsoft Windows is prone to a remote denial-of-service vulnerability that occurs in the Windows kernel 'Win32k.sys' kernel-mode device driver. A remote attacker can exploit this issue to crash the Windows kernel, denying service to legitimate users.

Technologies Affected

  • Avaya Aura Conferencing 6.0 Standard
  • Microsoft Windows 7
  • Microsoft Windows 7 Home Premium
  • Microsoft Windows 7 Home Premium - Sp1 X32
  • Microsoft Windows 7 Home Premium - Sp1 X64
  • Microsoft Windows 7 for 32-bit Systems
  • Microsoft Windows 7 for 32-bit Systems SP1
  • Microsoft Windows 7 for x64-based Systems
  • Microsoft Windows 7 for x64-based Systems SP1
  • Microsoft Windows Server 2008 R2
  • Microsoft Windows Server 2008 R2 Itanium
  • Microsoft Windows Server 2008 R2 Itanium SP1
  • Microsoft Windows Server 2008 R2 Standard Edition
  • Microsoft Windows Server 2008 R2 for x64-based Systems SP1
  • Microsoft Windows Server 2008 R2 x64
  • Microsoft Windows Server 2008 R2 x64 SP1
  • Microsoft Windows Server 2008 Standard Edition R2
  • Microsoft Windows Server 2008 Standard Edition R2 SP1

Recommendations

Block external access at the network boundary, unless external parties require service.

If global access isn't needed, block access at the network perimeter to computers hosting the vulnerable operating system.

Deploy network intrusion detection systems to monitor network traffic for malicious activity.

Deploy NIDS to monitor network traffic for signs of anomalous or suspicious activity such as unexplained incoming and outgoing traffic. This may indicate exploit attempts or activity that results from successful exploits.

Do not use client software to access unknown or untrusted hosts from critical systems.

To limit the risk of exploits, never connect to unknown or untrusted services.
Vendor updates are available. Please see the references for more information.

Credits

Will Dorman of the CERT/CC
Copyright © Symantec Corporation.
Permission to redistribute this alert electronically is granted as long as it is not edited in any way unless authorized by Symantec Security Response. Reprinting the whole or part of this alert in any medium other than electronically requires permission from secure@symantec.com.

Disclaimer
The information in the advisory is believed to be accurate at the time of publishing based on currently available information. Use of the information constitutes acceptance for use in an AS IS condition. There are no warranties with regard to this information. Neither the author nor the publisher accepts any liability for any direct, indirect, or consequential loss or damage arising from use of, or reliance on, this information.
Symantec, Symantec products, Symantec Security Response, and secure@symantec.com are registered trademarks of Symantec Corp. and/or affiliated companies in the United States and other countries. All other registered and unregistered trademarks represented in this document are the sole property of their respective companies/owners.

Threat Intelligence

Subscribe
Follow the Threat Intelligence Twitter feed
STAR Antimalware Protection Technologies
Internet Security Threat Report
Symantec DeepSight Screensaver