Generic SSL (PCT/TLS) Updates for IIS and Microsoft Internet Products

ID: Q148427

The information in this article applies to:

Microsoft Windows NT Server version 4.0 SP3
Microsoft Windows NT Server, Enterprise Edition version 4.0
Microsoft Internet Information Server versions 3.0, 4.0
Microsoft Site Server version 3.0, Commerce Edition
Microsoft Site Server, Enterprise Edition
Microsoft Exchange Server, versions 5.0, 5.5

SUMMARY

On July 17, 1998 Microsoft released an updated version of Schannel.dll. This latest version provides the following benefits:

Resolves the vulnerability in SSL (Secure Sockets Layer) discovered by Daniel Bleichenbacher of Bell Labs. For more information, please see the following Microsoft Security Bulletin at:

http://www.microsoft.com/security/bulletins/ms98-002.htm

Banks outside the U.S. and Canada can now use extremely strong 128-bit encryption.

Eliminates the need for separate SGC and non-SGC versions of Schannel.dll.

Corrects the "Bad Password" error message documented in the following article in the Microsoft Knowledge Base:

Q179550 : Installing a Certificate in IIS May Result in Bad Password Error

Includes an updated version of Sgcinst.exe that corrects the problem where SGCINST appears to execute but SGC does not work. For more information, please see the following article in the Microsoft Knowledge Base:

Q180018 : SGCINST.EXE Appears to Execute but SGC Does Not Work

For more information on the Server Gated Cryptography (SGC), please go to the following Microsoft web site:

http://www.microsoft.com/security/sgc

MORE INFORMATION

Schannel.dll is available at the following Internet location:

ftp://ftp.microsoft.com/bussys/winnt/winnt-public/fixes/usa/NT40/hotfixes-postSP3/ssl-fix/

Residents of the US and Canada can download the North American (128-bit) version of Schannel.dll from:

http://mssecure.www.conxion.com/cgi-bin/ntitar.pl

The updated version of Schannel.dll is also available in Windows NT version 4.0 Service Pack 4 and later. For additional information, please see the following article in the Microsoft Knowledge Base:

Q152734 How to Obtain the Latest Windows NT 4.0 Service Pack

Additional query words: sp3 iis international banking win95 ie internet explorer
3.02 4.01 "adaptive chosen cyphertext" cryptoanalysis SSL2 PCT1 SSL3 TLS1 "Error Message Vulnerability"


Keywords          : 
Version           : winnt:3.0,4.0,4.0 SP3,5.0,5.5
Platform          : winnt 
Issue type        : kbinfo

Last Reviewed: May 7, 1999