Nullcode Hunting Security Bugs

Severity Rating: Critical
Revision Note: V1.2 (January 27, 2012): Corrected the aggregate severity rating for the KB2631813 update package in the Affected Software table for all supported editions of Windows XP, Windows Server 2003, Windows Vista, and Windows Server 2008. This is a bulletin change only. There were no changes to the security update files or detection logic. Customers should apply all update packages offered for the software installed on their systems. See the update FAQ for details.
Summary: This security update resolves two privately reported vulnerabilities in Microsoft Windows. The vulnerabilities could allow remote code execution if a user opens a specially crafted media file. An attacker who successfully exploited the vulnerabilities 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.

Severity Rating: Important
Revision Note: V2.3 (January 24, 2012): Added an entry to the update FAQ to announce a detection change for KB2251481, KB2251487, and KB2251489 to correct an installation issue. This is a detection change only. There were no changes to the security update files. Customers who have already successfully updated their systems do not need to take any action.
Summary: This security update resolves a privately reported vulnerability in Microsoft XML Editor. The vulnerability could allow information disclosure if a user opened a specially crafted Web Service Discovery (.disco) file with one of the affected software listed in this bulletin. Note that this vulnerability would not allow an attacker to execute code or to elevate their user rights directly, but it could be used to produce information that could be used to try to further compromise the affected system.

Severity Rating: Important
Revision Note: V4.2 (January 24, 2012): Added an entry to the update FAQ to announce a detection change for KB2538242, KB2538243, KB2467173, KB2538218, KB2538241, and KB2542054 to correct an installation issue. This is a detection change only. There were no changes to the security update files. Customers who have already successfully updated their systems do not need to take any action.
Summary: This security update resolves a publicly disclosed vulnerability in certain applications built using the Microsoft Foundation Class (MFC) Library. The vulnerability could allow remote code execution if a user opens a legitimate file associated with such an affected application, and the file is located in the same network folder as a specially crafted library file. For an attack to be successful, a user must visit an untrusted remote file system location or WebDAV share and open a document from this location that is then loaded by the affected application.

Severity Rating: Important
Revision Note: V1.1 (January 18, 2012): Added MS10-085 as a bulletin replaced by the KB2585542 update for Windows 7 for 32-bit Systems, Windows 7 for x64-based Systems, Windows Server 2008 R2 for x64-based Systems, and Windows Server 2008 R2 for Itanium-based Systems. This is an informational change only. There were no changes to the detection logic or the update files.
Summary: This security update resolves a publicly disclosed vulnerability in SSL 3.0 and TLS 1.0. This vulnerability affects the protocol itself and is not specific to the Windows operating system. The vulnerability could allow information disclosure if an attacker intercepts encrypted web traffic served from an affected system. TLS 1.1, TLS 1.2, and all cipher suites that do not use CBC mode are not affected.

Severity Rating: Critical
Revision Note: V1.2 (January 17, 2012): Added entry to the update FAQ to announce that the Security updates for the Microsoft .NET Framework 3.5 on Windows 8 Developer Preview and the Microsoft .NET Framework 4.5 on Windows 8 Developer Preview are available from Microsoft Update and Windows Update.
Summary: This security update resolves one publicly disclosed vulnerability and three privately reported vulnerabilities in Microsoft .NET Framework. The most severe of these vulnerabilities could allow elevation of privilege if an unauthenticated attacker sends a specially crafted web request to the target site. An attacker who successfully exploited this vulnerability could take any action in the context of an existing account on the ASP.NET site, including executing arbitrary commands. In order to exploit this vulnerability, an attacker must be able to register an account on the ASP.NET site, and must know an existing user name.

Severity Rating: Important
Revision Note: V2.1 (January 16, 2012): Added a link to Microsoft Knowledge Base Article 2607664 under Known Issues in the Executive Summary. Also, revised entry in the update FAQ to clarify why the upgrade to AntiXSS Library version 4.2.1 is only available from the Microsoft Download Center.
Summary: This security update resolves one privately reported vulnerability in the Microsoft Anti-Cross Site Scripting (AntiXSS) Library. The vulnerability could allow information disclosure if an attacker passes a malicious script to a website using the sanitization function of the AntiXSS Library. The consequences of the disclosure of that information depends on the nature of the information itself. Note that this vulnerability would not allow an attacker to execute code or to elevate the attacker's user rights directly, but it could be used to produce information that could be used to try to further compromise the affected system. Only sites that use the sanitization module of the AntiXSS Library are affected by this vulnerability.

Severity Rating: Important
Revision Note: V1.0 (January 10, 2012): Bulletin published.
Summary: This security update resolves a privately reported vulnerability in Microsoft Windows. The vulnerability could allow remote code execution if a user opens a specially crafted Microsoft Office file containing a malicious embedded ClickOnce application. 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.

Severity Rating: Important
Revision Note: V1.2 (January 10, 2012): Announced that this update, MS11-099, enables the protections provided in the Vulnerability in SSL/TLS Could Allow Information Disclosure update, MS12-006, for Internet Explorer. For more information, see the Update FAQ.
Summary: This security update resolves three privately reported vulnerabilities in Internet Explorer. The most severe vulnerability could allow remote code execution if a user opens a legitimate HyperText Markup Language (HTML) file that is located in the same directory as a specially crafted dynamic link library (DLL) file.

Severity Rating: Important
Revision Note: V1.0 (January 10, 2012): Bulletin published.
Summary: This security update resolves one privately reported vulnerability in Microsoft Windows. The vulnerability could allow elevation of privilege if an attacker successfully exploited this vulnerability. The attacker could then take complete control of the affected system and install programs; view, change, or delete data; or create new accounts with full user rights. Only systems configured with a Chinese, Japanese, or Korean system locale are affected.

Severity Rating: Important
Revision Note: V1.0 (January 10, 2012): Bulletin published.
Summary: This security update resolves a privately reported vulnerability in Microsoft Windows. The vulnerability could allow an attacker to bypass the SafeSEH security feature in a software application. An attacker could then use other vulnerabilities to leverage the structured exception handler to run arbitrary code. Only software applications that were compiled using Microsoft Visual C++ .NET 2003 can be used to exploit this vulnerability.

Severity Rating: Important
Revision Note: V1.0 (January 10, 2012): Bulletin published.
Summary: This security update resolves a privately reported vulnerability in Microsoft Windows. The vulnerability could allow remote code execution if a user opens a legitimate file with an embedded packaged object that is located in the same network directory as a specially crafted executable file. An attacker who successfully exploited this vulnerability could gain the same user rights as the logged-on user. An attacker could then install programs; view, change, or delete data; or create new accounts with full user 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.

Severity Rating: Important
Revision Note: V1.1 (December 21, 2011): Added an entry to the Update FAQ to explain why this update is offered to customers running PowerPoint 2010 Service Pack 1.
Summary: This security update resolves two privately reported vulnerabilities in Microsoft Office. The vulnerabilities could allow remote code execution if a user opens a specially crafted PowerPoint file. An attacker who successfully exploited either of the vulnerabilities could take complete control of an affected system. 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.

Severity Rating: Important
Revision Note: V1.1 (December 21, 2011): Added Microsoft Office Compatibility Pack Service Pack 3 to the Non-Affected Software table. This is an informational change only. There were no changes to the detection logic or the update files.
Summary: This security update resolves a privately reported vulnerability in Microsoft Office. The vulnerability could allow remote code execution if a user opens a specially crafted Excel file. An attacker who successfully exploited this vulnerability could gain the same user rights as the logged-on 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. Installing and configuring Office File Validation (OFV) to prevent the opening of suspicious files blocks the attack vectors for exploiting the vulnerabilities described in CVE-2011-3403.

Severity Rating: Important
Revision Note: V1.1 (December 16, 2011): Expanded the list of non-affected software and revised the Update FAQ to help clarify that this update may be offered to non-affected software when the vulnerable shared component of Microsoft Office is present.
Summary: This security update resolves a privately reported vulnerability in Microsoft Office. The vulnerability could allow remote code execution if a user opens a specially crafted Word file. An attacker who successfully exploited this vulnerability could gain the same user rights as the logged-on 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.

Severity Rating: Important
Revision Note: V1.0 (December 13, 2011): Bulletin published.
Summary: This security update resolves a privately reported vulnerability in Microsoft Office IME (Chinese). The vulnerability could allow elevation of privilege if a logged-on user performed specific actions on a system where an affected version of the Microsoft Pinyin (MSPY) Input Method Editor (IME) for Simplified Chinese is installed. 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. Only implementations of Microsoft Pinyin IME 2010 are affected by this vulnerability. Other versions of Simplified Chinese IME and other implementations of IME are not affected.

Severity Rating: Important
Revision Note: V1.0 (December 13, 2011): Bulletin published.
Summary: This security update resolves four privately reported vulnerabilities in Microsoft Office. The most severe vulnerabilities could allow remote code execution if a user opens a specially crafted Publisher file. 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. 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.

Severity Rating: Important
Revision Note: V1.0 (December 13, 2011): Bulletin published.
Summary: This security update resolves a privately reported vulnerability in Microsoft Windows. The vulnerability could allow elevation of privilege if an attacker logs on to an affected system and runs a specially crafted application designed to exploit the vulnerability. 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.

Severity Rating: Critical
Revision Note: V1.0 (December 13, 2011): Bulletin published.
Summary: This security update resolves a publicly disclosed vulnerability in Microsoft Windows. The vulnerability could allow remote code execution if a user opens a specially crafted document or visits a malicious Web page that embeds TrueType font files.

Severity Rating: Important
Revision Note: V1.0 (December 13, 2011): Bulletin published.
Summary: This security update resolves a privately reported vulnerability in Microsoft Windows. The vulnerability could allow elevation of privilege if an attacker logs on to an affected system and runs a specially crafted application designed to send a device event message to a higher-integrity process. An attacker must have valid logon credentials and be able to log on locally to exploit this vulnerability.

Severity Rating: Critical
Revision Note: V1.0 (December 13, 2011): Bulletin published.
Summary: This security update resolves a privately reported vulnerability in Windows Media Player and Windows Media Center. The vulnerability could allow remote code execution if a user opens a specially crafted Microsoft Digital Video Recording (.dvr-ms) file. In all cases, a user cannot be forced to open the file; for an attack to be successful, a user must be convinced to do so.

Severity Rating: Important
Revision Note: V1.0 (December 13, 2011): Bulletin published.
Summary: This security update resolves a privately reported vulnerability in Active Directory, Active Directory Application Mode (ADAM), and Active Directory Lightweight Directory Service (AD LDS). The vulnerability could allow remote code execution if an attacker logs on to an Active Directory domain and runs a specially crafted application. To exploit this vulnerability, an attacker would first need to acquire credentials to log on to an Active Directory domain.

Severity Rating: Critical
Revision Note: V1.1 (December 13, 2011): Corrected the kill bit information for the HP Photo Creative ActiveX control in the section, Third-Party Kill Bits. This is an informational change only. There were no changes to the security update files or detection logic.
Summary: This security update resolves a privately reported vulnerability in Microsoft software. The vulnerability could allow remote code execution if a user views a specially crafted Web page that instantiates a specific ActiveX control with 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. This update also includes kill bits for four third-party ActiveX controls.

Severity Rating: Important
Revision Note: V1.0 (December 13, 2011): Bulletin published.
Summary: This security update resolves a privately reported vulnerability in all supported editions of Windows XP and Windows Server 2003. This security update is rated Important for all supported editions of Windows XP and Windows Server 2003. Windows Vista, Windows Server 2008, Windows 7, and Windows Server 2008 R2 are not affected by the vulnerability. For more information, see the subsection, Affected and Non-Affected Software, in this section. The vulnerability could allow remote code execution if a user opens a file that contains a specially crafted OLE object. 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.

Severity Rating: Critical
Revision Note: V2.4 (November 30, 2011): Corrected the bulletin replacement information for .NET Framework 4 on Windows 7 for x64-based Systems Service Pack 1, Windows Server 2008 R2 for x64-based Systems Service Pack 1, and Windows Server 2008 R2 for Itanium-based Systems Service Pack 1. This is a bulletin change only. There were no changes to the detection or security update files.
Summary: This security update resolves a publicly disclosed vulnerability in Microsoft .NET Framework. The vulnerability could allow remote code execution on a client system if a user views a specially crafted Web page using a Web browser that can run XAML Browser Applications (XBAPs). 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. The vulnerability could also allow remote code execution on a server system running IIS, if that server allows processing ASP.NET pages and an attacker succeeds in uploading a specially crafted ASP.NET page to that server and then executes the page, as could be the case in a Web hosting scenario. This vulnerability could also be used by Windows .NET applications to bypass Code Access Security (CAS) restrictions.

Severity Rating: Important
Revision Note: V2.1 (November 15, 2011): Corrected the install verification registry keys, update log file name, and removal information for Windows XP and Windows Server 2003. This is an informational change only.
Summary: This security update resolves a publicly disclosed vulnerability in the MHTML protocol handler in Microsoft Windows. The vulnerability could allow information disclosure if a user opens a specially crafted URL from an attacker's web site. An attacker would have to convince the user to visit the web site, typically by getting them to follow a link in an e-mail message or Instant Messenger message.

Severity Rating: Critical
Revision Note: V1.0 (November 8, 2011): Bulletin published.
Summary: This security update resolves a privately reported vulnerability in Microsoft Windows. The vulnerability could allow remote code execution if an attacker sends a continuous flow of specially crafted UDP packets to a closed port on a target system.

Severity Rating: Important
Revision Note: V1.0 (November 8, 2011): Bulletin published.
Summary: This security update resolves a privately reported vulnerability in Microsoft Windows. The vulnerability could allow remote code execution if a user opens a legitimate file (such as an .eml or .wcinv file) that is located in the same network directory as a specially crafted dynamic link library (DLL) file. Then, while opening the legitimate file, Windows Mail or Windows Meeting Space 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 .eml or .wcinv file) from this location that is then loaded by a vulnerable application.

Severity Rating: Important
Revision Note: V1.0 (November 8, 2011): Bulletin published.
Summary: This security update resolves a privately reported vulnerability in Active Directory, Active Directory Application Mode (ADAM), and Active Directory Lightweight Directory Service (AD LDS). The vulnerability could allow elevation of privilege if Active Directory is configured to use LDAP over SSL (LDAPS) and an attacker acquires a revoked certificate that is associated with a valid domain account and then uses that revoked certificate to authenticate to the Active Directory domain. By default, Active Directory is not configured to use LDAP over SSL.

Severity Rating: Moderate
Revision Note: V1.0 (November 8, 2011): Bulletin published.
Summary: This security update resolves a privately reported vulnerability in Microsoft Windows. The vulnerability could allow denial of service if a user opens a specially crafted TrueType font file as an e-mail attachment or navigates to a network share or WebDAV location containing a specially crafted TrueType font file. For an attack to be successful, a user must visit the untrusted remote file system location or WebDAV share containing the specially crafted TrueType font file, or open the file as an e-mail attachment. In all cases, however, an attacker would have no way to force users to perform these actions. Instead, an attacker would have to persuade users to do so, typically by getting them to click a link in an e-mail message or Instant Messenger message.

Severity Rating: Important
Revision Note: V2.0 (November 8, 2011): Rereleased this bulletin to announce availability of an update for Windows 7 Embedded. No other update packages are affected by this rerelease.
Summary: This security update resolves a publicly disclosed vulnerability in Microsoft Windows. The vulnerability could allow remote code execution if a user opens a legitimate rich text format file (.rtf), text file (.txt), or Word document (.doc) that is located in the same network directory as a specially crafted dynamic link library (DLL) 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.

Severity Rating: Critical
Revision Note: V1.2 (November 2, 2011): Announced the release of a hotfix to resolve a known issue affecting Internet Explorer 7 customers after the KB2586448 security update is installed. See the Update FAQ for details.
Summary: This security update resolves eight privately reported vulnerabilities in Internet Explorer. The most severe vulnerabilities could allow remote code execution if a user views a specially crafted Web page using Internet Explorer. An attacker who successfully exploited any of these vulnerabilities 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.

Severity Rating: Critical
Revision Note: V1.2 (October 26, 2011): Corrected Server Core installation applicability for .NET Framework 4 on Windows Server 2008 R2 for x64-based Systems.
Summary: This security update resolves a privately reported vulnerability in Microsoft .NET Framework and Microsoft Silverlight. The vulnerability could allow remote code execution on a client system if a user views a specially crafted Web page using a Web browser that can run XAML Browser Applications (XBAPs) or Silverlight applications. 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. The vulnerability could also allow remote code execution on a server system running IIS, if that server allows processing ASP.NET pages and an attacker succeeds in uploading a specially crafted ASP.NET page to that server and then executes the page, as could be the case in a Web hosting scenario. This vulnerability could also be used by Windows .NET applications to bypass Code Access Security (CAS) restrictions.

Severity Rating: Critical
Revision Note: V1.1 (October 26, 2011): Corrected Server Core installation applicability for .NET Framework 4 on Windows Server 2008 R2 for x64-based Systems.
Summary: This security update resolves a privately reported vulnerability in Microsoft .NET Framework and Microsoft Silverlight. The vulnerability could allow remote code execution on a client system if a user views a specially crafted Web page using a Web browser that can run XAML Browser Applications (XBAPs) or Silverlight applications. 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. The vulnerability could also allow remote code execution on a server system running IIS, if that server allows processing ASP.NET pages and an attacker succeeds in uploading a specially crafted ASP.NET page to that server and then executes the page, as could be the case in a Web hosting scenario. This vulnerability could also be used by Windows .NET applications to bypass Code Access Security (CAS) restrictions.

Severity Rating: Moderate
Revision Note: V1.2 (October 26, 2011): Corrected Server Core installation applicability for .NET Framework 4 on Windows Server 2008 R2 for x64-based Systems.
Summary: This security update resolves a privately reported vulnerability in Microsoft .NET Framework. The vulnerability could allow information disclosure if a user views a specially crafted Web page using a Web browser that can run XAML Browser Applications (XBAPs). In a Web-based attack scenario, an attacker could host a Web site that contains a Web page that is used to exploit this vulnerability. In addition, compromised Web sites and Web sites that accept or host user-provided content or advertisements could contain specially crafted content that could exploit this vulnerability. In all cases, however, an attacker would have no way to force users to visit these Web sites. Instead, an attacker would have to convince users to visit the Web site, typically by getting them to click a link in an e-mail message or Instant Messenger message that takes users to the attacker’s Web site. This vulnerability could also be used by Windows .NET applications to bypass Code Access Security (CAS) restrictions.

Severity Rating: Critical
Revision Note: V1.2 (October 26, 2011): Corrected Server Core installation applicability for .NET Framework 4 on Windows Server 2008 R2 for x64-based Systems.
Summary: This security update resolves a publicly disclosed vulnerability in Microsoft .NET Framework. The vulnerability could allow remote code execution on a client system if a user views a specially crafted Web page using a Web browser that can run XAML Browser Applications (XBAPs). 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. The vulnerability could also allow remote code execution on a server system running IIS, if that server allows processing ASP.NET pages and an attacker succeeds in uploading a specially crafted ASP.NET page to that server and then executes the page, as could be the case in a Web hosting scenario. This vulnerability could also be used by Windows .NET applications to bypass Code Access Security (CAS) restrictions.

Severity Rating: Important
Revision Note: V1.1 (October 26, 2011): Corrected Server Core installation applicability for .NET Framework 4 on Windows Server 2008 R2 for x64-based Systems.
Summary: This security update resolves a privately reported vulnerability in ASP.NET Chart controls. The vulnerability could allow information disclosure if an attacker sent a specially crafted GET request to an affected server hosting the Chart controls. Note that this vulnerability would not allow an attacker to execute code or to elevate the attacker's user rights directly, but it could be used to retrieve information that could be used to further compromise the affected system. Only web applications using Microsoft Chart Control are affected by this issue. Default installations of the .NET Framework are not affected. This security update is rated Important for Microsoft .NET Framework 4 on all supported releases of Microsoft Windows and for Chart Control for Microsoft .NET Framework 3.5 Service Pack 1. For more information, see the subsection, Affected and Non-Affected Software, in this section.

Severity Rating: Critical
Revision Note: V3.1 (October 26, 2011): Corrected Server Core installation applicability for .NET Framework 4 on Windows Server 2008 R2 for x64-based Systems.
Summary: This security update resolves a privately reported vulnerability in Microsoft .NET Framework. The vulnerability could allow remote code execution on a client system if a user views a specially crafted Web page using a Web browser that can run XAML Browser Applications (XBAPs). 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. The vulnerability could also allow remote code execution on a server system running IIS, if that server allows processing ASP.NET pages and an attacker succeeds in uploading a specially crafted ASP.NET page to that server and then executes the page, as could be the case in a Web hosting scenario.

Severity Rating: Important
Revision Note: V4.2 (October 26, 2011): Corrected Server Core installation applicability for .NET Framework 4 on Windows Server 2008 R2 for x64-based Systems.
Summary: This security update resolves a publicly disclosed vulnerability in ASP.NET. The vulnerability could allow information disclosure. An attacker who successfully exploited this vulnerability could read data, such as the view state, which was encrypted by the server. This vulnerability can also be used for data tampering, which, if successfully exploited, could be used to decrypt and tamper with the data encrypted by the server. Microsoft .NET Framework versions prior to Microsoft .NET Framework 3.5 Service Pack 1 are not affected by the file content disclosure portion of this vulnerability.

Severity Rating: Critical
Revision Note: V1.2 (October 25, 2011): Announced a change to detection logic and corrected bulletin replacement information for some affected configurations. There were no changes to the security update files. See the Update FAQ for details.
Summary: This security update resolves two privately reported vulnerabilities in Windows DNS server. The more severe of these vulnerabilities could allow remote code execution if an attacker registers a domain, creates an NAPTR DNS resource record, and then sends a specially crafted NAPTR query to the target DNS server. Servers that do not have the DNS role enabled are not at risk.

Severity Rating: Important
Revision Note: V1.2 (October 25, 2011): Revised the update file names for 32-bit and x64-based editions of Windows XP and Windows Server 2003, in accordance with the schema documented in Microsoft Knowledgebase Article KB816915. This is a change to file names only. There were no changes to the detection logic or update content. Customers who have already successfully installed this update do not need to take any action.
Summary: This security update resolves a privately reported vulnerability in the Microsoft Active Accessibility component. The vulnerability could allow remote code execution if an attacker convinces a user to open a legitimate file that is located in the same network directory as a specially crafted dynamic link library (DLL) file. Then, while opening the legitimate file, the Microsoft Active Accessibility component 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 document from this location that is then loaded by a vulnerable application.

Severity Rating: Important
Revision Note: V1.1 (October 11, 2011): Announced a detection logic change for update KB2553094. There were no changes to the security update files. See the Update FAQ for details.
Summary: This security update resolves five privately reported vulnerabilities in Microsoft Office. The vulnerabilities could allow remote code execution if a user opens a specially crafted Excel file. An attacker who successfully exploited any of these vulnerabilities could gain the same user rights as the logged-on 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. Installing and configuring Office File Validation (OFV) to prevent the opening of suspicious files blocks the attack vectors for exploiting the vulnerabilities described in CVE-2011-1986 and CVE-2011-1987. See the section, Frequently Asked Questions (FAQ) Related to This Security Update, for more information about how the Office File Validation feature can be configured to block the attack vectors.

Severity Rating: Important
Revision Note: V1.0 (October 11, 2011): Bulletin published.
Summary: This security update resolves a publicly disclosed vulnerability in Windows Media Center. The vulnerability could allow remote code execution if an attacker convinces a user to open a legitimate file that is located in the same network directory as a specially crafted dynamic link library (DLL) file. Then, while opening the legitimate file, Windows Media Center 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.

Severity Rating: Important
Revision Note: V1.0 (October 11, 2011): Bulletin published.
Summary: This security update resolves five privately reported vulnerabilities in Forefront Unified Access Gateway (UAG). The most severe of these vulnerabilities could allow remote code execution if a user visits an affected Web site using a specially crafted URL. However, an attacker would have no way to force users to visit such a Web site. Instead, an attacker would have to persuade users to visit the Web site, typically by getting them to click a link in an e-mail message or Instant Messenger message that takes users to the attacker's Web site.

Severity Rating: Important
Revision Note: V1.0 (October 11, 2011): Bulletin published.
Summary: This security update resolves two publicly disclosed vulnerabilities in Host Integration Server. The vulnerabilities could allow denial of service if a remote attacker sends specially crafted network packets to a Host Integration Server listening on UDP port 1478 or TCP ports 1477 and 1478. 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. In this case, the Host Integration Server ports should be blocked from the Internet.

Severity Rating: Important
Revision Note: V1.0 (October 11, 2011): Bulletin published.
Summary: This security update resolves a privately reported vulnerability in the Microsoft Windows Ancillary Function Driver (AFD). The vulnerability could allow elevation of privilege if an attacker logs on to a user's system and runs a specially crafted application. An attacker must have valid logon credentials and be able to log on locally to exploit the vulnerability.

Severity Rating: Important
Revision Note: V1.3 (October 11, 2011): Announced changes to detection logic for some affected configurations. There were no changes to the security update files. See the Update FAQ for details.
Summary: This security update resolves five privately reported vulnerabilities and one publicly disclosed vulnerability in Microsoft SharePoint and Windows SharePoint Services. The most severe vulnerabilities could allow elevation of privilege if a user clicked on a specially crafted URL or visited a specially crafted Web site. For the most severe vulnerabilities, Internet Explorer 8 and Internet Explorer 9 users browsing to a SharePoint site in the Internet Zone are at a reduced risk because, by default, the XSS Filter in Internet Explorer 8 and Internet Explorer 9 helps to block the attacks in the Internet Zone. The XSS Filter in Internet Explorer 8 and Internet Explorer 9, however, is not enabled by default in the Intranet Zone.

Severity Rating: Important
Revision Note: V1.0 (October 11, 2011): Bulletin published.
Summary: This security update resolves four privately reported vulnerabilities in Microsoft Windows. The most severe of these vulnerabilities could allow remote code execution if a user opens a specially crafted font file (such as a .fon file) in a network share, a UNC or WebDAV location, or an e-mail attachment. For a remote attack to be successful, a user must visit an untrusted remote file system location or WebDAV share and open the specially crafted font file, or open the file as an e-mail attachment.

Severity Rating: Critical
Revision Note: V2.1 (September 21, 2011): Corrected the registry key verification entries in the Security Update Deployment section for Windows XP and Windows Server 2003.
Summary: This security update resolves a privately reported vulnerability in Microsoft Windows. The vulnerability could allow remote code execution if an attacker sent a specially crafted SMB response to a client-initiated SMB request. To exploit the vulnerability, an attacker must convince the user to initiate an SMB connection to a specially crafted SMB server.

Severity Rating: Important
Revision Note: V1.0 (September 13, 2011): Bulletin published.
Summary: This security update resolves two privately reported vulnerabilities in Microsoft Office. The vulnerabilities could allow remote code execution if a user opens a specially crafted Office file or if a user opens a legitimate Office file that is located in the same network directory as a specially crafted library file. An attacker who successfully exploited either of the vulnerabilities could gain the same user rights as the logged on 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.

Severity Rating: Important
Revision Note: V1.0 (September 13, 2011): Bulletin published.
Summary: This security update resolves a privately reported vulnerability in the Windows Internet Name Service (WINS). The vulnerability could allow elevation of privilege if a user received a specially crafted WINS replication packet on an affected system running the WINS service. An attacker must have valid logon credentials and be able to log on locally to exploit this vulnerability.