DOCUMENT:Q244613 08-MAY-2002 [iis] TITLE :IIS 4.0 SSL ISAPI Filter Can Leak Single Buffer of Plaintext PRODUCT :Internet Information Server PROD/VER::4.0 OPER/SYS: KEYWORDS:kbSecurity kbDSupport kbIIS kbiis400 kbgraphxlinkcritical ====================================================================== ------------------------------------------------------------------------------- The information in this article applies to: - Microsoft Internet Information Server version 4.0 ------------------------------------------------------------------------------- SYMPTOMS ======== Unencrypted data may appear in the Secure Sockets Layer (SSL) package under heavy load if an ISAPI filter is programmed in such a way that it sends and receives data at the same time for the same connection. RESOLUTION ========== Windows NT 4.0 -------------- A supported fix is now available from Microsoft, but it is only intended to correct the problem described in this article and should be applied only to systems experiencing this specific problem. To resolve this problem, contact Microsoft Product Support Services to obtain the fix. For a complete list of Microsoft Product Support Services phone numbers and information on support costs, please go to the following address on the World Wide Web: http://support.microsoft.com/default.aspx?scid=fh;EN-US;CNTACTMS NOTE: In special cases, charges that are normally incurred for support calls may be canceled, if a Microsoft Support Professional determines that a specific update will resolve your problem. Normal support costs will apply to additional support questions and issues that do not qualify for the specific update in question. The following files are available for download from the Microsoft Download Center: x86: DownloadDownload Sslune4i.exe now (http://www.microsoft.com/downloads/release.asp?ReleaseID=16186) Alpha: DownloadDownload Sslune4a.exe now (http://www.microsoft.com/downloads/release.asp?ReleaseID=16187) For additional information about how to download Microsoft Support files, click the article number below to view the article in the Microsoft Knowledge Base: Q119591 How to Obtain Microsoft Support Files from Online Services Microsoft used the most current virus detection software available on the date of posting to scan this file for viruses. After it is posted, the file is housed on secure servers that prevent any unauthorized changes to the file. The English version of this fix should have the following file attributes or later: Date Time Version Size File name Platform ------------------------------------------------------------- 10/26/99 10:09a 4.02.0728 329,024 Asp.dll (x86) 10/26/99 09:18a 4.02.0728 11,396 Httpext.h (x86) 10/26/99 10:07a 4.02.0728 184,736 Infocomm.dll (x86) 10/26/99 10:08a 4.02.0728 11,248 Iwrps.dll (x86) 10/26/99 10:08a 4.02.0728 38,256 Ssinc.dll (x86) 10/26/99 10:08a 4.02.0728 25,360 Sspifilt.dll (x86) 10/26/99 10:08a 4.02.0728 228,464 W3svc.dll (x86) 10/26/99 10:07a 4.02.0728 87,504 Wam.dll (x86) 10/26/99 10:09a 4.02.0728 549,648 Asp.dll (Alpha) 10/26/99 09:22a 4.02.0728 11,396 Httpext.h (Alpha) 10/26/99 10:07a 4.02.0728 303,888 Infocomm.dll (Alpha) 10/26/99 10:08a 4.02.0728 16,656 Iwrps.dll (Alpha) 10/26/99 10:08a 4.02.0728 60,176 Ssinc.dll (Alpha) 10/26/99 10:09a 4.02.0728 39,696 Sspifilt.dll (Alpha) 10/26/99 10:08a 4.02.0728 383,760 W3svc.dll (Alpha) 10/26/99 10:08a 4.02.0728 149,264 Wam.dll (Alpha) Microsoft Windows NT Server version 4.0, Terminal Server Edition ---------------------------------------------------------------- To resolve this problem, obtain the Windows NT Server 4.0, Terminal Server Edition, Security Rollup Package (SRP). For additional information about the SRP, click the article number below to view the article in the Microsoft Knowledge Base: Q317636 Windows NT Server 4.0, Terminal Server Edition, Security Rollup Package STATUS ====== Microsoft has confirmed this to be a problem in Internet Information Server 4.0. Additional query words: security_patch tsesrp iisapi, iissecurity, iisui ====================================================================== Keywords : kbSecurity kbDSupport kbIIS kbiis400 kbgraphxlinkcritical Technology : kbiisSearch kbiis400 Version : :4.0 Hardware : ALPHA x86 Issue type : kbbug Solution Type : kbfix ============================================================================= THE INFORMATION PROVIDED IN THE MICROSOFT KNOWLEDGE BASE IS PROVIDED "AS IS" WITHOUT WARRANTY OF ANY KIND. MICROSOFT DISCLAIMS ALL WARRANTIES, EITHER EXPRESS OR IMPLIED, INCLUDING THE WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. IN NO EVENT SHALL MICROSOFT CORPORATION OR ITS SUPPLIERS BE LIABLE FOR ANY DAMAGES WHATSOEVER INCLUDING DIRECT, INDIRECT, INCIDENTAL, CONSEQUENTIAL, LOSS OF BUSINESS PROFITS OR SPECIAL DAMAGES, EVEN IF MICROSOFT CORPORATION OR ITS SUPPLIERS HAVE BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES. SOME STATES DO NOT ALLOW THE EXCLUSION OR LIMITATION OF LIABILITY FOR CONSEQUENTIAL OR INCIDENTAL DAMAGES SO THE FOREGOING LIMITATION MAY NOT APPLY. Copyright Microsoft Corporation 2002.