Patch Tuesday is here again. Here's the rundown of what was fixed.

MS09-018

Vulnerabilities in Active Directory Could Allow Remote Code Execution (971055)

This security update resolves two privately reported vulnerabilities in implementations of Active Directory on Microsoft Windows 2000 Server and Windows Server 2003, and Active Directory Application Mode (ADAM) when installed on Windows XP Professional and Windows Server 2003. The more severe vulnerability could allow remote code execution. An attacker who successfully exploited this vulnerability could take complete control of an affected system remotely. An attacker could then install programs; view, change, or delete data; or create new accounts with full user rights. Firewall best practices and standard default firewall configurations can help protect networks from attacks that originate outside the enterprise perimeter. Best practices recommend that systems that are connected to the Internet have a minimal number of ports exposed.

MS09-022

Vulnerabilities in Windows Print Spooler Could Allow Remote Code Execution (961501)

This security update resolves three privately reported vulnerabilities in Windows Print Spooler. The most severe vulnerability could allow remote code execution if an affected server received a specially crafted RPC request. Firewall best practices and standard default firewall configurations can help protect networks from attacks that originate outside the enterprise perimeter. Best practices recommend that systems that are connected to the Internet have a minimal number of ports exposed.

MS09-019

Cumulative Security Update for Internet Explorer (969897)

This security update resolves seven privately reported vulnerabilities and one publicly disclosed vulnerability in Internet Explorer. The more severe of the vulnerabilities could allow remote code execution if a user views a specially crafted Web page using Internet Explorer. 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.

MS09-027

Vulnerabilities in Microsoft Office Word Could Allow Remote Code Execution (969514)

This security update resolves two privately reported vulnerabilities that could allow remote code execution if a user opens a specially crafted Word file. An attacker who successfully exploited either vulnerability could take complete control of an affected system. An attacker could then install programs; view, change, or delete data; or create new accounts with full user rights.

MS09-021

Vulnerabilities in Microsoft Office Excel Could Allow Remote Code Execution (969462)

This security update resolves several privately reported vulnerabilities that could allow remote code execution if a user opens a specially crafted Excel file that includes a malformed record object. An attacker who successfully exploited any of these vulnerabilities could take complete control of an affected system. An attacker could then install programs; view, change, or delete data; or create new accounts with full user rights.

MS09-024

Vulnerability in Microsoft Works Converters Could Allow Remote Code Execution (957632)

This security update resolves a privately reported vulnerability in the Microsoft Works converters. The vulnerability could allow remote code execution if a user opens a specially crafted Works file. An attacker who successfully exploited this vulnerability could gain the same user rights as the local user. 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.

MS09-026

Vulnerability in RPC Could Allow Elevation of Privilege (970238)

This security update resolves a publicly disclosed vulnerability in the Windows remote procedure call (RPC) facility where the RPC Marshalling Engine does not update its internal state appropriately. The vulnerability could allow an attacker to execute arbitrary code and take complete control of an affected system. Supported editions of Microsoft Windows are not delivered with any RPC servers or clients that are subject to exploitation of this vulnerability. In a default configuration, users could not be attacked by exploitation of this vulnerability. However, the vulnerability is present in the Microsoft Windows RPC runtime and could affect third-party RPC applications.

MS09-025

Vulnerabilities in Windows Kernel Could Allow Elevation of Privilege (968537)

This security update resolves two publicly disclosed and two privately reported vulnerabilities in the Windows kernel that could allow elevation of privilege. An attacker who successfully exploited any of these vulnerabilities could execute arbitrary code and take complete control of an affected system. An attacker could then install programs; view, change, or delete data; or create new accounts with full user rights. An attacker must have valid logon credentials and be able to log on locally to exploit these vulnerabilities. The vulnerabilities could not be exploited remotely or by anonymous users.

MS09-020

Vulnerabilities in Internet Information Services (IIS) Could Allow Elevation of Privilege (970483)

This security update resolves one publicly disclosed vulnerability and one privately reported vulnerability in Microsoft Internet Information Services (IIS). The vulnerabilities could allow elevation of privilege if an attacker sent a specially crafted HTTP request to a Web site that requires authentication. These vulnerabilities allow an attacker to bypass the IIS configuration that specifies which type of authentication is allowed, but not the file system-based access control list (ACL) check that verifies whether a file is accessible by a given user. Successful exploitation of these vulnerabilities would still restrict the attacker to the permissions granted to the anonymous user account by the file system ACLs.

MS09-023

Vulnerability in Windows Search Could Allow Information Disclosure (963093)

This security update resolves a privately reported vulnerability in Windows Search. The vulnerability could allow information disclosure if a user performs a search that returns a specially crafted file as the first result or if the user previews a specially crafted file from the search results. By default, the Windows Search component is not preinstalled on Microsoft Windows XP and Windows Server 2003. It is an optional component available for download. Windows Search installed on supported editions of Windows Vista and Windows Server 2008 is not affected by this vulnerability.

Read more: http://www.microsoft.com/technet/security/bulletin/ms09-jun.mspx