Connection security may not be detected correctly in Internet Explorer 6 or Internet Explorer 5

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Article ID: 840837 - View products that this article applies to.
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SYMPTOMS

When you connect to a Web server, Microsoft Internet Explorer may not correctly detect the security level of the connection. For example, a connection that is not encrypted may be detected as an encrypted channel that provides Secure Sockets Layer (SSL) encryption.

CAUSE

This problem may occur if the Web server uses a certificate that has an RSA public key exponent of 1.

RESOLUTION

Hotfix information for Microsoft Windows Server 2003

A supported hotfix is available from Microsoft. However, this hotfix is intended to correct only the problem that is described in this article. Apply this hotfix only to systems that are experiencing this specific problem. This hotfix might receive additional testing. Therefore, if you are not severely affected by this problem, we recommend that you wait for the next software update that contains this hotfix.

If the hotfix is available for download, there is a "Hotfix download available" section at the top of this Knowledge Base article. If this section does not appear, contact Microsoft Customer Service and Support to obtain the hotfix.

Note If additional issues occur or if any troubleshooting is required, you might have to create a separate service request. The usual support costs will apply to additional support questions and issues that do not qualify for this specific hotfix. For a complete list of Microsoft Customer Service and Support telephone numbers or to create a separate service request, visit the following Microsoft Web site:
http://support.microsoft.com/contactus/?ws=support
Note The "Hotfix download available" form displays the languages for which the hotfix is available. If you do not see your language, it is because a hotfix is not available for that language.

File information

The English version of this hotfix has the file attributes (or later file attributes) that are listed in the following table. The dates and times for these files are listed in coordinated universal time (UTC). When you view the file information, it is converted to local time. To find the difference between UTC and local time, use the Time Zone tab in the Date and Time tool in Control Panel.
Windows Server 2003, 64-bit editions
Date         Time   Version            Size    File name
------------------------------------------------------------
09-Jun-2004  17:08  5.2.3790.183      481,280   Schannel.dll     
09-Jun-2004  17:07  5.2.3790.183      153,600  Wschannel.dll   


Windows Server 2003, 32-bit editions
Date         Time   Version            Size    File name
-----------------------------------------------------------
09-Jun-2004  17:07  5.2.3790.183      153,600  Schannel.dll     


Hotfix information for Microsoft Windows XP

A supported hotfix is available from Microsoft. However, this hotfix is intended to correct only the problem that is described in this article. Apply this hotfix only to systems that are experiencing this specific problem. This hotfix might receive additional testing. Therefore, if you are not severely affected by this problem, we recommend that you wait for the next software update that contains this hotfix.

If the hotfix is available for download, there is a "Hotfix download available" section at the top of this Knowledge Base article. If this section does not appear, contact Microsoft Customer Service and Support to obtain the hotfix.

Note If additional issues occur or if any troubleshooting is required, you might have to create a separate service request. The usual support costs will apply to additional support questions and issues that do not qualify for this specific hotfix. For a complete list of Microsoft Customer Service and Support telephone numbers or to create a separate service request, visit the following Microsoft Web site:
http://support.microsoft.com/contactus/?ws=support
Note The "Hotfix download available" form displays the languages for which the hotfix is available. If you do not see your language, it is because a hotfix is not available for that language.

File information

The English version of this hotfix has the file attributes (or later file attributes) that are listed in the following table. The dates and times for these files are listed in coordinated universal time (UTC). When you view the file information, it is converted to local time. To find the difference between UTC and local time, use the Time Zone tab in the Date and Time tool in Control Panel.
Windows XP, 64-bit editions
Date         Time   Version            Size    File name
--------------------------------------------------------------
10-Jun-2004  08:12  5.1.2600.1540     508,928  Schannel.dll     
10-Jun-2004  08:07  5.1.2600.1540     137,728  Wschannel.dll   



Windows XP, 32-bit editions
Date         Time   Version            Size    File name
-----------------------------------------------------------
10-Jun-2004  08:07  5.1.2600.1540     137,728  Schannel.dll

Hotfix information for Microsoft Windows 2000

A supported hotfix is available from Microsoft. However, this hotfix is intended to correct only the problem that is described in this article. Apply this hotfix only to systems that are experiencing this specific problem. This hotfix might receive additional testing. Therefore, if you are not severely affected by this problem, we recommend that you wait for the next software update that contains this hotfix.

If the hotfix is available for download, there is a "Hotfix download available" section at the top of this Knowledge Base article. If this section does not appear, contact Microsoft Customer Service and Support to obtain the hotfix.

Note If additional issues occur or if any troubleshooting is required, you might have to create a separate service request. The usual support costs will apply to additional support questions and issues that do not qualify for this specific hotfix. For a complete list of Microsoft Customer Service and Support telephone numbers or to create a separate service request, visit the following Microsoft Web site:
http://support.microsoft.com/contactus/?ws=support
Note The "Hotfix download available" form displays the languages for which the hotfix is available. If you do not see your language, it is because a hotfix is not available for that language.

File information

The English version of this hotfix has the file attributes (or later file attributes) that are listed in the following table. The dates and times for these files are listed in coordinated universal time (UTC). When you view the file information, it is converted to local time. To find the difference between UTC and local time, use the Time Zone tab in the Date and Time tool in Control Panel.
Date         Time   Version            Size    File name
--------------------------------------------------------------     
24-Jun-2004  20:29  5.1.2195.6944     147,216  Schannel.dll

STATUS

Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.

MORE INFORMATION

Warning If you use Registry Editor incorrectly, you may cause serious problems that may require you to reinstall your operating system. Microsoft cannot guarantee that you can solve problems that result from using Registry Editor incorrectly. Use Registry Editor at your own risk.

When a Web server uses a certificate with an RSA public key exponent of 1, the private key exponent is also set to 1. If these conditions are present, the connection has no encryption security. After you apply this hotfix, the connection to the Web server will fail when a certificate with an RSA public key exponent of 1 is detected.

After you apply this hotfix, you can configure your computer to allow a connection to a Web server that uses a certificate with an RSA public key exponent of 1. To do this, follow these steps:
  1. Click Start, click Run, type regedit, and then click OK.
  2. Locate the following registry subkey:
    HKLM\SYSTEM\CurrentControlSet\Control\SecurityProviders\SCHANNEL
  3. Right-click SCHANNEL, point to New, and then click DWORD Value.
  4. Type IgnoreExponentOfOne, and then press ENTER.
  5. Right-click IgnoreExponentOfOne, and then click Modify.
  6. In the Value data box, type 00000001, and then click OK.
  7. Quit Registry Editor.
For additional information, click the following article number to view the article in the Microsoft Knowledge Base:
824684 Description of the standard terminology that is used to describe Microsoft software updates

Properties

Article ID: 840837 - Last Review: August 29, 2007 - Revision: 2.4
APPLIES TO
  • Microsoft Internet Explorer 6.0, when used with:
    • Microsoft Windows Server 2003, Standard Edition (32-bit x86)
    • the operating system: Microsoft Windows XP
  • Microsoft Internet Explorer 5.0, when used with:
    • the operating system: Microsoft Windows 2000
Keywords: 
kbautohotfix kbhotfixserver kbqfe kbwinserv2003presp1fix kbwinxppresp3fix kbwin2000sp5fix KB840837

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