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Bulletin IDBulletin Title and Executive SummaryMaximum Severity Rating and Vulnerability Impact
MS12-020 Vulnerabilities in Remote Desktop Could Allow Remote Code Execution (2671387) 

This security update resolves two privately reported vulnerabilities in the Remote Desktop Protocol. The more severe of these vulnerabilities could allow remote code execution if an attacker sends a sequence of specially crafted RDP packets to an affected system. By default, the Remote Desktop Protocol (RDP) is not enabled on any Windows operating system. Systems that do not have RDP enabled are not at risk.
Critical 
Remote Code Execution
MS12-017 Vulnerability in DNS Server Could Allow Denial of Service (2647170) 

This security update resolves a privately reported vulnerability in Microsoft Windows. The vulnerability could allow denial of service if a remote unauthenticated attacker sends a specially crafted DNS query to the target DNS server.
Important 
Denial of Service
MS12-018 Vulnerability in Windows Kernel-Mode Drivers Could Allow Elevation of Privilege (2641653) 

This security update resolves a privately reported vulnerability in Microsoft Windows. The vulnerability 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 this vulnerability.
Important 
Elevation of Privilege
MS12-021 Vulnerability in Visual Studio Could Allow Elevation of Privilege (2651019) 

This security update resolves one privately reported vulnerability in Visual Studio. The vulnerability could allow elevation of privilege if an attacker places a specially crafted add-in in the path used by Visual Studio and convinces a user with higher privileges to start Visual Studio. 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.
Important 
Elevation of Privilege
MS12-022 Vulnerability in Expression Design Could Allow Remote Code Execution (2651018) 

This security update resolves one privately reported vulnerability in Microsoft Expression Design. The vulnerability could allow remote code execution if a user opens a legitimate file (such as an .xpr or .DESIGN file) that is located in the same network directory as a specially crafted dynamic link library (DLL) file. Then, while opening the legitimate file, Microsoft Expression Design could attempt to load the DLL file and execute any code it contained. For an attack to be successful, a user must visit an untrusted remote file system location or WebDAV share and open a legitimate file (such as an .xpr or .DESIGN file) from this location that is then loaded by a vulnerable application.
Important 
Remote Code Execution
MS12-019 Vulnerability in DirectWrite Could Allow Denial of Service (2665364) 

This security update resolves a publicly disclosed vulnerability in Windows DirectWrite. In an Instant Messager-based attack scenario, the vulnerability could allow denial of service if an attacker sends a specially crafted sequence of Unicode characters directly to an Instant Messenger client. The target application could become unresponsive when DirectWrite renders the specially crafted sequence of Unicode characters.
Moderate 
Denial of Service