Home page logo
/

bugtraq logo Bugtraq mailing list archives

Microsoft Security Bulletin (MS99-058)
From: aleph1 () UNDERGROUND ORG (Aleph One)
Date: Tue, 21 Dec 1999 17:01:15 -0800


The following is a Security  Bulletin from the Microsoft Product Security
Notification Service.

Please do not  reply to this message,  as it was sent  from an unattended
mailbox.
                    ********************************

Microsoft Security Bulletin (MS99-058)
--------------------------------------

Patch Available for "Virtual Directory Naming" Vulnerability
Originally Posted: December 21, 1999

Summary
=======
Microsoft has released a patch that eliminates a vulnerability in
Microsoft(r) Internet Information Server and other products that run atop
it. Under certain conditions, the vulnerability could cause a web server to
send the source code of .ASP and other files to a visiting user.

Frequently asked questions regarding this vulnerability can be found at
http://www.microsoft.com/security/bulletins/MS99-058faq.asp.

Issue
=====
If a file on one of the affected web server products resides in a virtual
directory whose name contains a legal file extension, the normal server-side
processing of the file can be bypassed. The vulnerability would manifest
itself in different ways depending on the specific file type requested, the
specific file extension in the virtual directory name, and the permissions
that the requester has in the directory. In most cases, an error would
result and the requested file would not be served. In the worse case, the
source code of .ASP or other files could be sent to the browser.

This vulnerability would be most likely to occur due to administrator error,
or if a product generated an affected virtual directory name by default.
(Front Page Server Extensions is one such product). Recommended security
practices militate against including sensitive information in .ASP and other
files that require server-side processing, and if this recommendation is
observed, there would be no sensitive information divulged even if this
vulnerability occurred. In any event, an affected virtual directory could be
identified during routine testing of the server.

Affected Software Versions
==========================
 - Microsoft Internet Information Server 4.0
 - Microsoft Site Server 3.0
 - Microsoft Site Server Commerce Edition 3.0

Patch Availability
==================
 - Intel:
   http://www.microsoft.com/Downloads/Release.asp?ReleaseID=16378
 - alpha:
   http://www.microsoft.com/Downloads/Release.asp?ReleaseID=16379

NOTE: Additional security patches are available at the Microsoft Download
Center.

More Information
================
Please see the following references for more information related to this
issue.
 - Microsoft Security Bulletin MS99-058: Frequently Asked Questions,
   http://www.microsoft.com/security/bulletins/MS99-058faq.asp.
 - Microsoft Knowledge Base (KB) article Q238606,
   Page Contents Visible For Certain Virtual Directory Names,
   http://support.microsoft.com/support/kb/articles/q238/6/06.asp.
   (Note: It may take 24 hours from the original posting of this
   bulletin for this KB article to be visible.)
 - Microsoft Knowledge Base (KB) article Q186803,
   Browsing Folders with Script-Mapped Extensions Returns Errors,
   http://support.microsoft.com/support/kb/articles/q186/8/03.asp.
 - Microsoft Security Advisor web site,
   http://www.microsoft.com/security/default.asp.

Obtaining Support on this Issue
===============================
This is a fully supported patch. Information on contacting Microsoft
Technical Support is available at
http://support.microsoft.com/support/contact/default.asp.

Acknowledgments
===============
Microsoft acknowledges Adam Hunger for bringing this issue to our attention.

Revisions
=========
 - December 21, 1999: Bulletin Created.

---------------------------------------------------------------------

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.

(c) 1999 Microsoft Corporation. All rights reserved. Terms of

   *******************************************************************
You have received  this e-mail bulletin as a result  of your registration
to  the   Microsoft  Product  Security  Notification   Service.  You  may
unsubscribe from this e-mail notification  service at any time by sending
an  e-mail  to  MICROSOFT_SECURITY-SIGNOFF-REQUEST () ANNOUNCE MICROSOFT COM
The subject line and message body are not used in processing the request,
and can be anything you like.

For  more  information on  the  Microsoft  Security Notification  Service
please visit http://www.microsoft.com/security/services/bulletin.asp. For
security-related information  about Microsoft products, please  visit the
Microsoft Security Advisor web site at http://www.microsoft.com/security.


  By Date           By Thread  

Current thread:
[ Nmap | Sec Tools | Mailing Lists | Site News | About/Contact | Advertising | Privacy ]