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Microsoft Security Bulletin (MS98-019) (fwd)
From: rattle () TLORAH NET (Rattle)
Date: Mon, 21 Dec 1998 15:56:44 -0600


Another IIS DoS attack?  Of course!

...
. Nick Levay
. rattle () tlorah net
. "There are two major products that come out of Berkeley:  LSD and UNIX.
. We do not believe this to be a coincidence."


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 (MS98-019)
--------------------------------------

Patch Available for IIS "GET" Vulnerability

Originally Posted: December 21, 1998

Summary
=======
Microsoft has released a patch that fixes a vulnerability in Microsoft(r)
Internet Information  Server(r) that could allow denial-of-service attacks
to be mounted against web servers.

There have been no reports of customers being affected by this
vulnerability. However, Microsoft  is publishing this bulletin and
releasing
the patch to allow customers to address the potential  security risk it
poses. As detailed below in What Customers Should Do, Microsoft recommends
that  users evaluate whether they are at risk from this attack and install
the patch if appropriate.

Issue
=====
This vulnerability involves the HTTP GET method, which is used to obtain
information from an IIS  web server. Specially-malformed GET requests can
create a denial of service situation that  consumes all server resources,
causing a server to "hang." In some cases, the server can be put  back into
service by stopping and restarting IIS; in others, the server may need to
be
rebooted.  This situation cannot happen accidentally. The malformed GET
requests must be deliberately  constructed and sent to the server. It is
important to note that this vulnerability does not  allow data on the
server
to be compromised, nor does it allow any privileges on it to be usurped.

Affected Software Versions
==========================
- Microsoft Internet Information Server, versions 3.0 and 4.0, on x86 and
Alpha platforms.

What Microsoft is Doing
=======================
On December 21, Microsoft released a patch that fixes the problem. This
patch is available for  download from the sites listed below.  Please see
What Customers Should Do for additional  information on the patch.

Microsoft has sent this security bulletin to customers subscribing
to the Microsoft Product Security Notification Service (see
http://www.microsoft.com/security/services/bulletin.asp for
more information about this free customer service).

Microsoft has published the following Knowledge Base (KB) article on this
issue:
- Microsoft Knowledge Base (KB) article Q192296,
  IIS: Patch Available for IIS "GET" Vulnerability,
  http://support.microsoft.com/support/kb/articles/q192/2/96.asp.
  (Note: It might take 24 hours from the original posting of this
  bulletin for the updated KB article to be visible in the Web-based
  Knowledge Base.)

Microsoft has released the following hot fixes:
- Fix for IIS 3.0 on X86 platforms:
  ftp://ftp.microsoft.com/bussys/iis/iis-public
  /fixes/usa/security/Infget-fix/infget3i.exe
- Fix for IIS 4.0 on X86 platforms:
  ftp://ftp.microsoft.com/bussys/iis/iis-public
  /fixes/usa/security/Infget-fix/infget4i.exe
- Fix for IIS 3.0 on Alpha platforms:
  ftp://ftp.microsoft.com/bussys/iis/iis-public
  /fixes/usa/security/Infget-fix/infget3a.exe
- Fix for IIS 4.0 on Alpha platforms:
  ftp://ftp.microsoft.com/bussys/iis/iis-public
  /fixes/usa/security/Infget-fix/infget4a.exe
(Note: the URLs above have been wrapped for readability)

What Customers Should Do
========================
The patch for this vulnerability is fully supported. However, it has not
been fully regression  tested and should only be applied to systems
determined to be at risk of attack. A fully  regression-tested version of
the patch will be available as part of the next Windows NT service  pack.

Microsoft recommends that customers evaluate the degree of risk that this
vulnerability poses to  their systems, based on physical accessibility,
network and Internet connectivity, and other  factors, and determine
whether
the appropriate course of action is to apply the patch or wait for  the
next
service pack.

More Information
================
Please see the following references for more information related to this
issue.
- Microsoft Security Bulletin 98-019,
  Patch Available for IIS "GET" Vulnerability
  (the Web-posted version of this bulletin),
  http://www.microsoft.com/security/bulletins/ms98-019.asp.
- Microsoft Knowledge Base (KB) article Q192296,
  IIS: Patch Available for IIS "GET" Vulnerability,
  http://support.microsoft.com/support/kb/articles/q192/2/96.asp.
  (Note: It might take 24 hours from the original posting of this
  bulletin for the updated KB article to be visible in the Web-based
  Knowledge Base.)

Obtaining Support on this Issue
===============================
This is a supported patch. If you have problems installing
this patch or require technical assistance with this patch,
please contact Microsoft Technical Support. For information
on contacting Microsoft Technical Support, please see
http://support.microsoft.com/support/contact/default.asp.

Acknowledgements
================
Microsoft wishes to acknowledge the contribution made by
Brian Steele of Cable and Wireless Grenada, Ltd. (www.candw.com),
and Eugene Kalinin of the N. N.Burdenko Neurosurgery Institute,
who reported the problem to us.

Revisions
=========
- December 21, 1998: Bulletin Created


For additional security-related information about Microsoft products,
please visit http://www.microsoft.com/security


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FOREGOING  LIMITATION MAY NOT APPLY.

(c) 1998 Microsoft Corporation. All rights reserved. Terms of Use.

  *******************************************************************
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/bulletin.htm.    For
security-related information  about Microsoft products, please  visit the
Microsoft Security Advisor web site at http://www.microsoft.com/security.



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