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Microsoft Security Bulletin (MS00-043) [forwarded from Microsoft Product Security]

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John Ladwig

unread,

Jul 19, 2000, 3:00:00 AM7/19/00

[ Response to the recent widely publicized Outlook/Outlook Express
vulnerabilities. The current tactic is to install a recent
Internet Explorer upgrade in such a way as to also upgrade Outlook
components. Ah, the joys of bundling...

A patch is promised which doesn't require pushing IE to 5.5+

Highly recommended.

-jml
]

------- start of forwarded message -------
From: Microsoft Product Security <secn...@MICROSOFT.COM>
To: MICROSOFT...@ANNOUNCE.MICROSOFT.COM
Subject: Microsoft Security Bulletin (MS00-043)
Date: Wed, 19 Jul 2000 00:18:10 -0700

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.
********************************

-----BEGIN PGP SIGNED MESSAGE-----

Microsoft Security Bulletin (MS00-043)
- --------------------------------------

Patch Available for "Malformed E-mail Header" Vulnerability

Originally posted: July 18, 2000

Summary
=======
Microsoft has released a patch that eliminates a security
vulnerability in Microsoft(r) Outlook(r) and Outlook Express. Under
certain conditions, the vulnerability could allow a malicious user to
cause code of his choice to execute on another user's computer.

Frequently asked questions regarding this vulnerability and the
patch can be found at
http://www.microsoft.com/technet/security/bulletin/fq00-043.asp

Issue
=====
A component shared by Outlook and Outlook Express contains an
unchecked buffer in the functionality that parses e-mail headers
when downloading mail via either POP3 or IMAP4. By sending an e-mail
that overruns the buffer, a malicious user could cause either of two
effects to occur when the mail was downloaded from the server by an
affected e-mail client:
- If the affected field were filled with random data, the
e-mail could be made to crash.
- If the affected field were filled with carefully-crafted
data, the e-mail client could be made to run code of the
malicious user's choice.

Customers who have installed Internet Explorer 5.01 Service Pack 1,
and customers who have installed Internet Explorer 5.5 on any system
other than Windows 2000, would not be affected by this vulnerability.
Likewise, Outlook users who have configured Outlook to use only MAPI
services would not be affected, regardless of what version of
Internet Explorer they have installed.

Affected Software Versions
==========================
- Microsoft Outlook Express 4.0
- Microsoft Outlook Express 4.01
- Microsoft Outlook Express 5.0
- Microsoft Outlook Express 5.01
- Microsoft Outlook 97
- Microsoft Outlook 98
- Microsoft Outlook 2000

Patch Availability
==================
The vulnerability can be eliminated by a default installation of
either of the following upgrades:
- Internet Explorer 5.01 Service Pack 1,
http://www.microsoft.com/Windows/ie/download/ie501sp1.htm
- Internet Explorer 5.5 on any system except Windows 2000,
http://www.microsoft.com/windows/ie/download/ie55.htm

Note: A non-default installation of IE 5.01 SP1 or IE 5.5 also will
eliminate this vulnerability, as long as an installation method is
chosen that installs upgraded Outlook Express components.

Note: When installed on a Windows 2000 machine, IE 5.5 does not
install upgraded Outlook Express components, and therefore does not
eliminate the vulnerability. However, Windows 2000 Service Pack 1
will install IE 5.5 and upgrade the Outlook Express components at
the same time.

Note: Patches will be available shortly that will eliminate the
vulnerability without requiring a full version upgrade. When they
are available, we will update this bulletin and re-release it.

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.
- Frequently Asked Questions: Microsoft Security Bulletin MS00-043,
http://www.microsoft.com/technet/security/bulletin/fq00-043.asp
- Microsoft Knowledge Base article Q267884 discusses this issue
and will be available soon.
- Microsoft TechNet Security web site,
http://www.microsoft.com/technet/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 thanks USSR Labs (www.ussrback.com) for reporting this
issue to us and working with us to protect customers.

Revisions
=========
- July 18, 2000: 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.

Last Updated July 18,2000

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*******************************************************************
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_SECURIT...@ANNOUNCE.MICROSOFT.COM
The subject line and message body are not used in processing the request,
and can be anything you like.

To verify the digital signature on this bulletin, please download our PGP
key at http://www.microsoft.com/technet/security/notify.asp.

For more information on the Microsoft Security Notification Service
please visit http://www.microsoft.com/technet/security/notify.asp. For
security-related information about Microsoft products, please visit the
Microsoft Security Advisor web site at http://www.microsoft.com/security.
------- end of forwarded message -------

John Ladwig

unread,

Jul 20, 2000, 3:00:00 AM7/20/00

[ Patches (not upgrades) available for the bad Date: header handling
vulnerability.

-jml
]
------- start of forwarded message -------
From: Microsoft Product Security <secn...@MICROSOFT.COM>
To: MICROSOFT...@ANNOUNCE.MICROSOFT.COM
Subject: Microsoft Security Bulletin (MS00-043)

Date: Thu, 20 Jul 2000 18:38:04 -0700

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.
********************************

-----BEGIN PGP SIGNED MESSAGE-----

Microsoft Security Bulletin (MS00-043)
- --------------------------------------

Patch Available for "Malformed E-mail Header" Vulnerability

Originally posted: July 18, 2000

Updated: July 20, 2000

Summary
=======
On July 18, 2000, Microsoft released the original version of this
bulletin, to advise customers of the issue and recommend that they
install either of the two service packs that will eliminate the
vulnerability. On July 20, 2000, the bulletin was updated to announce
the availability of patches that eliminate the vulnerability.

Microsoft has released a patch that eliminates a security
vulnerability in Microsoft(r) Outlook(r) and Outlook Express. Under
certain conditions, the vulnerability could allow a malicious user to
cause code of his choice to execute on another user's computer.

The patch eliminates this vulnerability as well as those discussed in
Microsoft Security Bulletins MS00-045 and MS00-046. Customers who
already have taken the corrective action discussed in either of these
bulletins do not need to take any additional action.

Frequently asked questions regarding this vulnerability and
the patch can be found at
http://www.microsoft.com/technet/security/bulletin/fq00-043.asp

Issue
=====
A component shared by Outlook and Outlook Express, Inetcomm.dll,

contains an unchecked buffer in the functionality that parses e-mail
headers when downloading mail via either POP3 or IMAP4. By sending an
e-mail that overruns the buffer, a malicious user could cause either
of two effects to occur when the mail was downloaded from the server
by an affected e-mail client:
- If the affected field were filled with random data, the
e-mail could be made to crash.
- If the affected field were filled with carefully-crafted data,
the e-mail client could be made to run code of the malicious
user's choice.

The vulnerability affects all Outlook Express users and all Outlook
users whose mail clients are configured to use either POP3 or IMAP4.

Outlook users who have configured Outlook to use only MAPI services

are unlikely to be affected by the vulnerability. Despite this,
Microsoft recommends that such customers apply one of the corrective
steps discussed in the Patch Availability section, primarily because
the patch protects against other vulnerabilities that affect all
Outlook users, regardless of the mail protocol they use.

A version of Inetcomm.dll that is not affected by the vulnerability
ships as part of Outlook Express 5.5, and customers who have
installed it do not need to take any additional action. Outlook
Express 5.5 is available as part of Internet Explorer 5.01 Service
Pack 1, and, except when installed on Windows 2000, Internet Explorer
5.5. Customers who do not wish to upgrade to Outlook Express 5.5
should install the patch provided below.

Patch Availability
==================
This vulnerability can be eliminated by taking any of the following
actions:
- Installing the patch available at
http://www.microsoft.com/windows/ie/download/critical/patch9.htm
- Performing a default installation of Internet Explorer 5.01
Service Pack 1,
http://www.microsoft.com/Windows/ie/download/ie501sp1.htm.
- Performing a default installation of Internet Explorer 5.5
(http://www.microsoft.com/windows/ie/download/ie55.htm)
on any system except Windows 2000.

Note: The patch requires IE 4.01 SP2
(http://www.microsoft.com/windows/ie/download/ie401sp2.htm) or
IE 5.01 (http://www.microsoft.com/windows/ie/download/ie501.htm)
to install. Customers who install this patch on versions other
than these may receive a message reading "This update does not
need to be installed on this system". This message is incorrect.
More information is available in KB article Q267884

Note: In addition to eliminating the vulnerability at issue
here, the steps above also eliminate all vulnerabilities
discussed in Microsoft Security Bulletins MS00-045
(http://www.microsoft.com/technet/security/bulletin/MS00-045.asp)
and MS00-046
(http://www.microsoft.com/technet/security/bulletin/MS00-046.asp).
Customers who already have taken the corrective action discussed
in either of these bulletins do not need to take any additional
action.

Note: Additional security patches are available at the Microsoft

Download Center (http://www.microsoft.com/downloads).

Revisions

=========
- July 18, 2000: Bulletin Created.

- July 20, 2000: Bulletin updated to announce availability of a
patch that does not require a full version upgrade of
Internet Explorer.

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

Last Updated July 20,2000

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