The information has been provided by Microsoft Product Security.
The original article can be found at: http://www.microsoft.com/technet/security/bulletin/MS07-066.mspx
* Windows Vista - Elevation of Privilege - Important - None
* Windows Vista x64 Edition - Elevation of Privilege - Important -None
* Microsoft Windows 2000 Service Pack 4
* Windows XP Service Pack 2
* Windows XP Professional x64 Edition and Windows XP Professional x64 Edition Service Pack 2
* Windows Server 2003 Service Pack 1 and Windows Server 2003 Service Pack 2
* Windows Server 2003 with SP1 for Itanium-based Systems and Windows Server 2003 with SP2 for Itanium based systems
* Windows Server 2003 x64 Edition and Windows Server x64 Edition Service Pack 2
Windows Kernel Vulnerability:
An elevation of privilege vulnerability exists in the way that the Windows kernel processes certain access requests. This vulnerability could allow an attacker to run code and to take complete control of the system. An attacker could then install programs; view, change, or delete data; or create new accounts with full administrative rights. Users whose accounts are configured to have fewer user rights on the system could be less impacted than users who operate with administrative user rights.
Mitigating Factors for Windows Kernel Vulnerability
Mitigation refers to a setting, common configuration, or general best-practice, existing in a default state, that could reduce the severity of exploitation of a vulnerability. The following mitigating factors may be helpful in your situation:
* An attacker must have valid logon credentials and be able to log on locally to exploit this vulnerability. The vulnerability could not be exploited remotely or by anonymous users.
FAQ for Windows Kernel Vulnerability
What is the scope of the vulnerability?
This is an elevation of privilege vulnerability. An attacker who successfully exploited this vulnerability could take complete control of an affected system, including installing programs; viewing, changing, or deleting data; or creating new accounts that have full privileges.
What causes the vulnerability?
Windows Advanced Local Procedure Call (ALPC) improperly validates certain conditions in legacy reply paths.
What is the kernel?
The kernel is the core of the operating system and it provides basic services for all other parts of the operating system.
What might an attacker use the vulnerability to do?
An attacker who successfully exploited this vulnerability could take complete control of an affected system, including installing programs; viewing, changing, or deleting data; or creating new accounts that have full privileges.
How could an attacker exploit the vulnerability?
To exploit this vulnerability, an attacker would first have to log on to the system. An attacker could then run a specially crafted application that could exploit the vulnerability and take complete control over the affected system.
What systems are primarily at risk from the vulnerability?
Systems that are running Windows Vista are the systems that are primarily at risk.
What does the update do?
The update removes the vulnerability by modifying the way that the Windows kernel validates certain conditions in legacy reply paths.
When this security bulletin was issued, had this vulnerability been publicly disclosed?
No. Microsoft received information about this vulnerability through responsible disclosure. Microsoft had not received any information to indicate that this vulnerability had been publicly disclosed when this security bulletin was originally issued.
When this security bulletin was issued, had Microsoft received any reports that this vulnerability was being exploited?
No. Microsoft had not received any information to indicate that this vulnerability had been publicly used to attack customers and had not seen any examples of proof of concept code published when this security bulletin was originally issued.