This article is intended to notify Web site administrators and IT professionals about the behavior of Internet Explorer when user information is included in a Web site address (HTTP or HTTPS URL).
By default, versions of Windows Internet Explorer that were released starting with the release of security update 832894 do not support handling user names and passwords in HTTP and HTTP with Secure Sockets Layer (SSL) or HTTPS URLs. The following URL syntax is not supported in Internet Explorer or in Windows Explorer:
This article is intended to notify you of this default behavior of Internet Explorer. If you include user information in HTTP or HTTPS URLs, we recommend that you explore the workarounds that are described in this article. For more information about the 832894 security update, visit the following Microsoft Web site:
Internet Explorer versions 3.0 to 6.0 support the following syntax for HTTP or HTTPS URLs:
You can use this URL syntax to automatically send user information to a Web site that supports the basic authentication method.
A malicious user might use this URL syntax to create a hyperlink that appears to open a legitimate Web site but actually opens a deceptive (spoofed) Web site. For example, the following URL appears to open http://www.wingtiptoys.com but actually opens http://example.com:
Note In this case, Internet Explorer 6 Service Pack 1 (SP1) and Internet Explorer 6 for Microsoft Windows Server 2003 only display "http://example.com" in the Address bar. However, earlier versions of Internet Explorer display "http://firstname.lastname@example.org" in the Address bar.
Additionally, malicious users can use this URL syntax together with other methods to create a link to a deceptive (spoofed) Web site that displays the URL to a legitimate Web site in the Status bar, Address bar, and Title bar of all versions of Internet Explorer.
For more information about this issue, click the following article number to view the article in the Microsoft Knowledge Base:
833786 Steps that you can take to help identify and to help protect yourself from deceptive (spoofed) Web sites and malicious hyperlinks
Explanation of the change in the default behavior
To mitigate the issues that are discussed in the "Background information" section, Internet Explorer and Windows Explorer no longer support handling HTTP and HTTPS URLs of this form. Windows Explorer and Internet Explorer do not open HTTP or HTTPS sites by using a URL that includes user information. By default, if user information is included in an HTTP or an HTTPS URL, a Web page that has the following title appears:
Invalid syntax error
Note This change in the default behavior does not affect other protocols. For example, you can still include user information in an FTP URL after you install the 832894 security update.
This change in the default behavior is also implemented by security updates, service packs, and versions of Internet Explorer that were released starting with the release of security update 832894.
Workarounds for users
URLs that are opened by users who type the URL in the Address bar or click a link
If users typically type HTTP or HTTPS URLs that include user information in the Address bar, or click links that include user information in HTTP or HTTPS URLs, you can work around this new functionality in Internet Explorer in two ways:
Do not include user information in HTTP or HTTPS URLs.
Instruct users not to include their user information when they type HTTP or HTTPS URLs.
If the Web site uses the basic authentication method, Internet Explorer automatically prompts users for a user name and a password. In some cases, users can click the Remember my password box in the dialog box to save their credentials for later visits to that Web site.
Workarounds for application and Web site developers
URLs that are opened by objects that call WinInet or Urlmon functions
For objects that use an HTTP or an HTTPS URL that includes user information when they call a WinInet or Urlmon function such as InternetOpenURL, rewrite the object to use one of the following methods to send user information to the Web site:
Use the InternetSetOption function and include the following option flags:
Note For these flags, the InternetSetOption option must have a handle returned by the InternetConnect function. Therefore, if the application uses the InternetOpenUrl function, modify the application to use the InternetConnect, HttpOpenRequest and HttpSendRequest WinInet functions. For more information about how to use these functions, visit the following Microsoft Web sites:
Note With this workaround, you can open Web sites that the URL-spoofing technique redirects. The whole URL appears, including the redirected location. For example, the following URL appears:
The user still arrives at the redirected Web site. In this example, the user arrives at http://www.example.com.
URLs that are opened by a script that uses credentials for state management
How to disable the new behavior or to use it in other programs
You can set registry values to use this new behavior in other programs that host the Web browser control or to disable this new behavior for Windows Explorer and Internet Explorer.
How programs that host the Web browser control can use this new default behavior to handle user information in HTTP or in HTTPS URLs
By default, this new default behavior for handling user information in HTTP or HTTPS URLs applies only to Windows Explorer and Internet Explorer. To use this new behavior in other programs that host the Web browser control, create a DWORD value named SampleApp.exe, where SampleApp.exe is the name of the executable file that runs the program. Set the DWORD value's value data to 1 in one of the following registry keys.
For all users of the program, set the value in the following registry key:
How to disable the new default behavior for handling user information in HTTP or HTTPS URLs
To have us disable the new default behavior in Windows Explorer and Internet Explorer for you, go to the "Fix it for me" section. If you prefer to fix this problem yourself, go to the "Let me fix it myself" section.
Fix it for me
To fix this problem automatically, click the Fix it button or link. In the File Download dialog box, click Run and then follow the steps in the Fix it Wizard.
The automatic fix will disable the new default behavior in Windows Explorer and Internet Explorer for all users of the program.
This wizard may be in English only. However, the automatic fix also works for other language versions of Windows.
If you are not on the computer that has the problem, save the Fix it solution to a flash drive or a CD and then run it on the computer that has the problem.
Microsoft provides third-party contact information to help you find technical support. This contact information may change without notice. Microsoft does not guarantee the accuracy of this third-party contact information.
Windows Internet Explorer 8, Windows Internet Explorer 7, Microsoft Internet Explorer 6.0, Microsoft Internet Explorer 5.5, Microsoft Windows Server 2003 Service Pack 1, Microsoft Windows Server 2003 Service Pack 2, Windows Vista Business, Windows Vista Enterprise, Windows Vista Home Basic, Windows Vista Home Premium, Windows Vista Starter, Windows Vista Ultimate