MS12-047  Vulnerability in Windows Kernel-Mode Drivers Could Allow Elevation of Privilege

2012-07-10 This security update resolves a privately reported vulnerability and a publicly disclosed vulnerability in Microsoft Windows. The vulnerabilities could allow elevation of privilege if an attacker logs on to a system and runs a specially crafted application. An attacker must have valid logon credentials and be able to log on locally to exploit any of these vulnerabilities. This security update is rated Important for all supported releases of Microsoft Windows. For more information, see the subsection, Affected and Non-Affected Software, in this section. The security update addresses the vulnerabilities by correcting the way that the Windows kernel-mode driver parses keyboard layout files. For more information about the vulnerabilities, see the Frequently Asked Questions (FAQ) subsection for the specific vulnerability entry under the next section, Vulnerability Information. Recommendation. The majority of customers have automatic updating enabled and will not need to take any action because this security update will be downloaded and installed automatically. Customers who have not enabled automatic updating need to check for updates and install this update manually. For information about specific configuration options in automatic updating, see Microsoft Knowledge Base Article 294871.For administrators and enterprise installations, or end users who want to install this security update manually, Microsoft recommends that customers apply the update at the earliest opportunity using update management software, or by checking for updates using the Microsoft Update service.See also the section, Detection and Deployment Tools and Guidance, later in this bulletin.Known Issues. None
Vulnerabilities addressed in this bulletin:

Keyboard Layout Vulnerability

An elevation of privilege vulnerability exists in the way that the Windows kernel-mode driver handles specific keyboard layouts. An attacker who successfully exploited this vulnerability could run arbitrary code in kernel mode. An attacker could then install programs; view, change, or delete data; or create new accounts with full administrative rights.
CVE-2012-1890

Win32k Incorrect Type Handling Vulnerability

An elevation of privilege vulnerability exists when the Windows kernel-mode driver improperly validates parameters when creating a hook procedure. An attacker who successfully exploited this vulnerability could run arbitrary code in kernel mode. An attacker could then install programs; view, change, or delete data; or create new accounts with full user rights.
CVE-2012-1893

Bulletin details at Microsoft.com