MS10-090: Cumulative security update for Internet Explorer

How to obtain help and support for this security update

Help installing updates:
Support for Microsoft Update

Security solutions for IT professionals:
TechNet Security Troubleshooting and Support

Help protect your computer that is running Windows from viruses and malware:
Virus Solution and Security Center

Local support according to your country:
International Support

Known issues with this security update

Note The following issues are resolved by security update 2482017. For more information, click the following article number to view the article in the Microsoft Knowledge Base:

2482017 MS11-003: Cumulative security update for Internet Explorer


After you install this security update, you may also have to install update 2467659. To determine whether you have to install update 2467659, review the known issues in the following list:

• This security update contains a fix that turns off the automatic detection of Japanese Industrial Standard (JIS) encoding. However, some software uses a component in Internet Explorer to interpret Japanese email messages that are in HTML format. Therefore, the content of the email message may be displayed in unreadable code. This issue occurs because the JIS encoding is not automatically detected. To resolve this issue, install update 2467659.
  
  

• 
  When you print or view the Print Preview page of an affected webpage in Internet Explorer, garbled characters may appear on the Print Preview and on the printed documents. This issue occurs even if you press F5 to reload the website.

• 
  After you install this security update, you may be prompted to install this security update again when you scan the system by using Windows Update, Microsoft Update, Microsoft Windows Server Update Services (WSUS) server or Microsoft Baseline Security Analyzer (MBSA). This issue may occur if you installed this security update, but you have not installed update 2467659. To resolve this issue, approve the installation of update 2467659 in WSUS or install update 2467659 from Windows Update, Microsoft Update or from the Microsoft Download center.
  
  
  
  

• After you install this security update, some Japan Industrial Standard (JIS) websites may not appear correctly in Internet Explorer. This issue can occur if the JIS-based website does not specify JIS encoding in the HTTP headers. For example, the website only specifies JIS in a Meta tag.
  
  To work around this issue, use one of the following methods:
  

  Server-side workaround
  To work around this problem from the server-side, the website's administrator can configure the webpage to use the following HTTP header:
  

  Content-Type: text/html;charset=iso-2022-jp

  
  
  

  Client-side workaroundsUse either of the following methods on the client computer to work around this issue:
  

  • To work around this issue while you are viewing the website, press F5 to refresh the page.
    
    
    
    
    
    
    
    
    

  • Alternatively, you can delete the Iexplore.exe and explore.exe registry DWORD entries from the registry on the client computer to unblock the JIS auto-detection.
    
    Warning This workaround may make a computer or a network more vulnerable to attack by malicious users or by malicious software such as viruses. We do not recommend this workaround but are providing this information so that you can implement this workaround at your own discretion. Use this workaround at your own risk. Specifically, if you delete the Iexplore.exe and explore.exe registry DWORD entries, the system may be more vulnerable to the security issues that are described in CVE-2010-3342 and CVE-2010-3348. For more information, see the following security bulletin:
    

    http://www.microsoft.com/technet/security/bulletin/MS10-090.mspxThe security bulletin provides more information about the issue in the following sections:
    

    • Cross-Domain Information Disclosure Vulnerability - CVE-2010-3342

    • Cross-Domain Information Disclosure Vulnerability - CVE-2010-3348

    
    
    This information includes the following:
    

    • Mitigating Factors

    • Workarounds

    • FAQ

    ImportantThis section, method, or task contains steps that tell you how to modify the registry. However, serious problems might occur if you modify the registry incorrectly. Therefore, make sure that you follow these steps carefully. For added protection, back up the registry before you modify it. Then, you can restore the registry if a problem occurs. For more information about how to back up and restore the registry, click the following article number to view the article in the Microsoft Knowledge Base:

    322756How to back up and restore the registry in Windows
    To delete the Iexplore.exe and Explore.exe registry DWORD entries, follow these steps:
    

    1. Click Start , type regedit in the Start Search box, and then click regedit.exe in the Programs list.
       
       
       If you are prompted for an administrator password or confirmation, type your password or click Continue.

    2. Locate and then click the following subkey in the registry:
       

       HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Internet Explorer\MAIN\FeatureControl\FEATURE_DISABLE_ISO_2022_JP_SNIFFING
       

    3. Right-click Iexplore.exe, and then click Delete.

    4. Click Yes to verify.

    5. Right-click Explore.exe, and then click Delete.

    6. Click Yes to verify.

    7. Exit Registry Editor, and then restart the computer.

    For more information about the FEATURE_DISABLE_ISO_2022_JP_SNIFFING registry subkey, see the following article in the Microsoft Knowledge Base:
    

    2467659 An update is available for Internet Explorer: December 14, 2010

Non-security-related fixes that are included in this security update

Fix it solution for the user-defined CSS

To enable or to disable the user-defined CSS workaround automatically, click the Fix it button or link under the Apply User-Defined CSS heading or under the Remove User-Defined CSS heading. Click Run in the File Download dialog box, and then follow the steps in the Fix it wizard.

Notes

• These wizards may be in English only. However, the automatic fixes also work for other language versions of Windows.

• If you are not logged on to the computer that has the problem, you can save the automatic fix to a flash drive or to a CD and then run the automatic fix on the computer that has the problem.

• If you decide not to install the current security update and instead choose to use the workaround that is described in security bulletin MS10-090, you can click the Fix it button to enable or to disable applying the user-defined CSS.

Fix it solution for Data Execution Prevention in Internet Explorer 7

To enable or to disable DEP automatically in Internet Explorer 7, click the Fix itbutton or link. Click
Runin the
File Downloaddialog box, and then follow the steps in the Fix it wizard.

Notes

• You do not have to have this database if you are using Internet Explorer 8 on Windows XP Service Pack 3 (SP3), on Windows Vista SP1, or on later versions of Windows. This is because Internet Explorer 8 opts-in to DEP by default on these platforms.

• If you decide not to install the current security update and instead decide to use the workaround that is described in MS10-018, you can click the Fix it button to enable or to disable DEP. Then, click Run in the File Download dialog box, and follow the steps in the wizard.

• These wizards may be in English only. However, the automatic fixes also work for other language versions of Windows.

• If you are not logged on to the computer that has the problem, you can save the Fix it solution to a flash drive or to a CD and then run the Fix it solution on the computer that has the problem.

• For this workaround to be effective, your processor must support hardware-enforced DEP. For more information about how to determine whether your system supports hardware-enforced DEP, click the following article number to view the article in the Microsoft Knowledge Base:
  

  912923How to determine that hardware DEP is available and configured on your computer
  

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