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
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