MS09-045: Vulnerability in JScript Scripting Engines could allow remote code execution

Microsoft has released security bulletin MS09-045. To view the complete security bulletin, visit one of the following Microsoft Web sites:

• Home users:
  http://www.microsoft.com/security/updates/bulletins/200909.aspx (http://www.microsoft.com/security/updates/bulletins/200909.aspx)
  Skip the details: Download the updates for your home computer or laptop from the Microsoft Update Web site now:
  http://update.microsoft.com/microsoftupdate (http://update.microsoft.com/microsoftupdate)
• IT professionals:
  http://www.microsoft.com/technet/security/bulletin/MS09-045.mspx (http://www.microsoft.com/technet/security/bulletin/MS09-045.mspx)

How to obtain help and support for this security update

For home users, no-charge support is available by calling 1-866-PCSAFETY in the United States and Canada or by contacting your local Microsoft subsidiary. For more information about how to contact your local Microsoft subsidiary for support issues with security updates, visit the Microsoft International Support Web site: North American customers can also obtain instant access to unlimited no-charge e-mail support or to unlimited individual chat support by visiting the following Microsoft Web site: For enterprise customers, support for security updates is available through your usual support contacts.

Known issue with this security update

You may be unable to uninstall this security update, or registry key verification may be incorrect in some scenarios. For example, this issue may occur in the following scenarios:

Scenario 1

1. You install this update for JScript 5.6 on a computer that is running Internet Explorer 6 and one of the following operating systems:
   • Windows XP Service Pack 2 and Windows XP Professional x64 Edition Service Pack 2
   • Windows Server 2003 Service Pack 2, Windows Server 2003 x64 Edition Service Pack 2, and Windows Server 2003 with SP2 for Itanium-based Systems
2. You install Internet Explorer 7.

In this scenario, the Internet Explorer 7 installation upgrades JScript 5.6 to version 5.7, and the corresponding security update for JScript 5.7 has to be installed. However, registry key verification incorrectly indicates that the update is already installed. Established methods to verify update installation, such as MBSA, Windows Update, Microsoft Update, WSUS, SCCM, and so on, correctly detect whether the update is required. Customers who implement custom detection methods that are based on registry key verification alone will be unable to accurately determine the installation state of this update in this scenario. We recommend that customers who implement custom detection base the detection on both registry key verification and file version verification. If one of these checks fails, the update may not be installed correctly.

Scenario 2

1. You install this update for JScript 5.6 on a computer that is running Internet Explorer 6 and one of the following operating systems:
   • Windows XP Service Pack 2
   • Windows Server 2003 Service Pack 2
2. You install Internet Explorer 7.
3. You install this update for JScript 5.7.

In this scenario, this security update for JScript 5.7 is not listed in the Add or Remove Programs item in Control Panel.

To avoid these issues, install Internet Explorer 7 or Internet Explorer 8 before you install this security update.

To resolve these issues, use one of the following methods:

• Method 1
  
  1. Install Internet Explorer 8.
  2. Install this security update for JScript 5.8.
• Method 2
  
  1. Un-install Internet Explorer 7 by using the Add or Remove Programs item in Control Panel.
  2. Un-install the security update for JScript 5.6.
  3. Reinstall Internet Explorer 7.

Affected systems These issues may affect the following systems:

• JScript 5.7 when it is used with:
  • Windows XP Service Pack 2
  • Windows Server 2003 Service Pack 2

These issues do not affect the following systems:

• Windows XP Service Pack 3, Windows Vista, Windows Server 2008, Windows 7, or Windows Server 2008 R2
• Operating systems that already have Internet Explorer 7 or Internet Explorer 8 installed before you install this security update.

Additional information about this security update

For more information about the security update for Jscript 5.7 in Windows 2000, click the following article number to view the article in the Microsoft Knowledge Base:

The English (United States) version of this software update installs files that have the attributes that are listed in the following tables. The dates and times for these files are listed in Coordinated Universal Time (UTC). The dates and times for these files on your local computer are displayed in your local time and with your current daylight saving time (DST) bias. Additionally, the dates and times may change when you perform certain operations on the files.

Windows 2000 file information

For all supported editions of JScript 5.6 in Microsoft Windows 2000 Service Pack 4

For all supported editions of JScript 5.7 in Microsoft Windows 2000 Service Pack 4

For more information about supported editions of Jscript 5.7 in Windows 2000, click the following article number to view the article in the Microsoft Knowledge Base:

Windows XP and Windows Server 2003 file information

• The files that apply to a specific milestone (RTM, SPn) and service branch (QFE, GDR) are noted in the "SP requirement" and "Service branch" columns.
• GDR service branches contain only those fixes that are widely released to address widespread, critical issues. QFE service branches contain hotfixes in addition to widely released fixes.
• In addition to the files that are listed in these tables, this software update also installs an associated security catalog file (KBnumber.cat) that is signed with a Microsoft digital signature.

For all supported x86-based versions of Windows XP

JScript 5.6

JScript 5.7

JScript 5.8

For all supported x64-based versions of Windows Server 2003 and of Windows XP Professional x64 edition

JScript 5.6

JScript 5.7

JScript 5.8

For all supported x86-based versions of Windows Server 2003

JScript 5.6

JScript 5.7

JScript 5.8

For all supported IA-64-based versions of Windows Server 2003

JScript 5.6

JScript 5.7

Windows Vista and Windows Server 2008 file information

• The files that apply to a specific product, milestone (RTM, SPn), and service branch (LDR, GDR) can be identified by examining the file version numbers as shown in the following table.
  Collapse this tableExpand this table

  Version	Product	Milestone	Service branch
  6.0.6000.16xxx	Windows Vista	RTM	GDR
  6.0.6000.20xxx	Windows Vista	RTM	LDR
  6.0.6001.18xxx	Windows Vista SP1 and Windows Server 2008 SP1	SP1	GDR
  6.0.6001.22xxx	Windows Vista SP1 and Windows Server 2008 SP1	SP1	LDR
  6.0.6002.18xxx	Windows Vista SP2 and Windows Server 2008 SP2	SP2	GDR
  6.0.6002.22xxx	Windows Vista SP2 and Windows Server 2008 SP2	SP2	LDR

• Service Pack 1 is integrated into the release version of Windows Server 2008. Therefore, RTM milestone files apply only to Windows Vista. RTM milestone files have a 6.0.0000.xxxxxx version number.
• GDR service branches contain only those fixes that are widely released to address widespread, critical issues. LDR service branches contain hotfixes in addition to widely released fixes.
• The MANIFEST files (.manifest) and the MUM files (.mum) that are installed for each environment are listed separately. MUM and MANIFEST files, and the associated security catalog (.cat) files, are critical to maintaining the state of the updated component. The security catalog files (attributes not listed) are signed with a Microsoft digital signature.

For all supported x86-based versions of Windows Server 2008 and of Windows Vista

JScript 5.7

JScript 5.8

For all supported x64-based versions of Windows Server 2008 and of Windows Vista

JScript 5.7

JScript 5.8

For all supported IA-64-based versions of Windows Server 2008

Additional file information for Windows Server 2008 and for Windows Vista

Additional files for all supported x86-based versions of Windows Server 2008 and of Windows Vista

Additional files for JScript 5.7

Additional files for JScript 5.8

Additional files for all supported x64-based versions of Windows Server 2008 and of Windows Vista

Additional files for JScript 5.7

Additional files for JScript 5.8

Additional files for all supported IA-64-based versions of Windows Server 2008