Microsoft Windows contains a vulnerability that could allow a local attacker to gain elevated privileges on a targeted system. Updates are available.
A vulnerability in the Microsoft Windows kernel-mode driver (win32k.sys) could allow a local attacker to gain elevated privileges.
The vulnerability is due to improper memory operations performed by the affected software. A local attacker could exploit the vulnerability by logging in to the targeted system and executing a crafted application designed to pass malicious input to the affected software. A successful exploit could allow the attacker to execute arbitrary code with elevated privileges, which could allow the attacker to completely compromise the system.
Microsoft has confirmed the vulnerability in a security bulletin and released software updates.
The following Microsoft products are affected:
Windows XP SP3
Windows XP Professional x64 Edition SP2
Windows Server 2003 and x64 Edition SP2
Windows Server 2003 with SP2 for Itanium-based Systems
Windows Vista and x64 Edition SP2
Windows Server 2008 for 32-bit and x64-based Systems SP2
Windows Server 2008 for Itanium-based Systems SP2
Windows 7 for 32-bit and x64-based Systems SP1
Windows Server 2008 R2 for x64-based and Itanium-based Systems SP1
Windows 8 for 32-bit and 64-bit Systems
Windows Server 2012
To exploit this vulnerability, an attacker requires authenticated and local access to the targeted system, which may require the attacker to access trusted, internal networks. These access requirements could limit the likelihood of a successful exploit.
Microsoft has resolved the vulnerability by correcting how the affected software handles objects in memory.
Microsoft has released a security bulletin at the following link: MS13-076
A local attacker could exploit the vulnerability to execute arbitrary code in the security context of another user. If the user has elevated privileges, an attacker could completely compromise the targeted system.
The vulnerability is due to improper memory operations performed by win32k.sys when handling objects in memory.
A local attacker could exploit the vulnerability by logging in to the targeted system and executing a crafted application designed to pass malicious input to the affected software. When the malicious input is processed by win32k.sys, a memory corruption error could allow the attacker to execute arbitrary code with elevated privileges. The ability to execute arbitrary code with elevated privileges could allow the attacker to completely compromise the system.
Administrators are advised to apply the appropriate updates.
Administrators are advised to allow only trusted users to access local systems.
Administrators may consider using IP-based access control lists (ACLs) to allow only trusted systems to access the affected systems.
Administrators may consider using the Microsoft Baseline Security Analyzer (MBSA) scan tool to identify common security misconfigurations and missing security updates on system endpoints.
Administrators are advised to monitor critical systems.
Microsoft customers can obtain updates directly by using the links in the security bulletin. These updates are also distributed by Windows automatic update features and available on the Microsoft Update service. Microsoft Windows Server Update Services (WSUS), Systems Management Server, and System Center Configuration Manager can assist administrators in deploying software updates.
Datacenter Edition SP2 | Datacenter Edition, 64-bit SP2 | Itanium-Based Systems Edition SP2 | Enterprise Edition SP2 | Enterprise Edition, 64-bit SP2 | Essential Business Server Standard SP2 | Essential Business Server Premium SP2 | Essential Business Server Premium, 64-bit SP2 | Standard Edition SP2 | Standard Edition, 64-bit SP2 | Web Server SP2 | Web Server, 64-bit SP2
Windows Server 2008 R2
x64-Based Systems Edition SP1 | Itanium-Based Systems Edition SP1
Windows Server 2012
Original Release Base
Home Basic SP2 | Home Premium SP2 | Business SP2 | Enterprise SP2 | Ultimate SP2 | Home Basic x64 Edition SP2 | Home Premium x64 Edition SP2 | Business x64 Edition SP2 | Enterprise x64 Edition SP2 | Ultimate x64 Edition SP2
Home Edition SP3 | Professional Edition SP3 | Professional x64 (AMD/EM64T) SP2 | Tablet PC Edition SP3 | Media Center Edition SP3
for 32-bit systems Base | for x64-based systems Base
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