Connection security may not be detected correctly in Internet Explorer 6 or Internet Explorer 5 (840837)


The information in this article applies to:

  • Microsoft Internet Explorer 6.0, when used with:
    • the operating system: Microsoft Windows Server 2003
    • the operating system: Microsoft Windows XP
  • Microsoft Internet Explorer 5.x, when used with:
    • the operating system: Microsoft Windows 2000
Important This article contains information about modifying the registry. Before you modify the registry, make sure to back it up and make sure that you understand how to restore the registry if a problem occurs. For information about how to back up, restore, and edit the registry, click the following article number to view the article in the Microsoft Knowledge Base:

256986 Description of the Microsoft Windows Registry

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 now available from Microsoft, but it is only intended to correct the problem that is described in this article. Only apply it to systems that are experiencing this specific problem. This hotfix may receive additional testing. Therefore, if you are not severely affected by this problem, we recommend that you wait for the next Windows Server 2003 service pack that contains this hotfix.

To resolve this problem immediately, contact Microsoft Product Support Services to obtain the hotfix. For a complete list of Microsoft Product Support Services phone numbers and information about support costs, visit the following Microsoft Web site:

http://support.microsoft.com/contactus/?ws=support

Note In special cases, charges that are ordinarily incurred for support calls may be canceled if a Microsoft Support Professional determines that a specific update will resolve your problem. The usual support costs will apply to additional support questions and issues that do not qualify for the specific update in question.

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 now available from Microsoft, but it is only intended to correct the problem that is described in this article. Only apply it to systems that are experiencing this specific problem. This hotfix may receive additional testing. Therefore, if you are not severely affected by this problem, we recommend that you wait for the next Windows XP service pack that contains this hotfix.

To resolve this problem immediately, contact Microsoft Product Support Services to obtain the hotfix. For a complete list of Microsoft Product Support Services phone numbers and information about support costs, visit the following Microsoft Web site:

http://support.microsoft.com/contactus/?ws=support

Note In special cases, charges that are ordinarily incurred for support calls may be canceled if a Microsoft Support Professional determines that a specific update will resolve your problem. The usual support costs will apply to additional support questions and issues that do not qualify for the specific update in question.

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 now available from Microsoft, but it is only intended to correct the problem that is described in this article. Only apply it to systems that are experiencing this specific problem. This hotfix may receive additional testing. Therefore, if you are not severely affected by this problem, we recommend that you wait for the next Windows 2000 service pack that contains this hotfix.

To resolve this problem immediately, contact Microsoft Product Support Services to obtain the hotfix. For a complete list of Microsoft Product Support Services phone numbers and information about support costs, visit the following Microsoft Web site:

http://support.microsoft.com/contactus/?ws=support

Note In special cases, charges that are ordinarily incurred for support calls may be canceled if a Microsoft Support Professional determines that a specific update will resolve your problem. The usual support costs will apply to additional support questions and issues that do not qualify for the specific update in question.

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

Modification Type:MinorLast Reviewed:6/5/2006
Keywords:kbHotfixServer kbQFE kbWinServ2003preSP1fix kbWinXPpreSP3fix kbWin2000SP5fix KB840837 kbAudITPRO kbAudEndUser
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