-----Original Message-----
From: UNIRAS (UK Govt CERT) [mailto:[EMAIL PROTECTED]]
Sent: 05 December 2002 10:08
To: [EMAIL PROTECTED]
Subject: UNIRAS Brief - 433/02 - Microsoft - Cumulative Patch for
Internet Explorer
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UNIRAS (UK Govt CERT) Briefing Notice - 433/02 dated 05.12.02 Time:
10:10
UNIRAS is part of NISCC(National Infrastructure Security Co-ordination
Centre)
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UNIRAS material is also available from its website at
www.uniras.gov.uk and
Information about NISCC is available from www.niscc.gov.uk
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Title
=====
Microsoft Security Bulletin - MS02-068:
Cumulative Patch for Internet Explorer
Detail
======
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Title: Cumulative Patch for Internet Explorer (Q324929)
Date: 04 December 2002
Software: Microsoft(r) Internet Explorer
Impact: Information Disclosure
Max Risk: Moderate
Bulletin: MS02-068
Microsoft encourages customers to review the Security Bulletins at:
http://www.microsoft.com/security/security_bulletins/MS02-068.asp
http://www.microsoft.com/technet/security/bulletin/MS02-068.asp.
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Issue:
======
This is a cumulative patch for Internet Explorer 5.5 and 6.0. In
addition to including the functionality of all previously released
patches for Internet Explorer 5.5 and 6.0, it also eliminates a
newly discovered flaw in Internet Explorer's cross-domain security
model. This flaw occurs because the security checks that Internet
Explorer carries out when particular object caching techniques are
used in web pages are incomplete. This could have the effect of
allowing a website in one domain to access information in another,
including the user's local system.
Exploiting the vulnerability could enable an attacker to read, but
not change, any file on the user's local computer. In addition, the
attacker could invoke an executable that was already present on the
local system. The attacker would need to know the exact location of
the executable, and would not be able to pass parameters to it.
Microsoft is not aware of any executable that ships by default as
part of Windows and, when run without parameters, could be
dangerous.
An attacker could exploit the vulnerability by constructing a web
page that uses a cached programming technique, and could then
either host it on a web site or send it to a user via email. In the
case of the web-based attack vector the page could be automatically
opened when a user visited the site In the case of the HTML mail-
based attack vector, the page could be opened when the recipient
opened the mail or viewed it using the Preview pane.
Mitigating Factors:
====================
- - -Internet Explorer 5.01 is not affected by this vulnerability.
- - -The web-based attack scenario would provide no way for the
attacker to force users to visit the site. Instead, the attacker
would need to lure them there, typically by getting them to click
on a link that would take them to the attacker's site.
- - -The HTML mail-based attack scenario would be blocked by Outlook
Express 6.0 and Outlook 2002 in their default configurations, and
by Outlook 98 and 2000 if used in conjunction with the Outlook
Email Security Update.
- - -The vulnerability would allow an attacker to read but not add,
delete or modify files on the user's local system.
- - -The attacker would need to know the name and location of any file
on the system to successfully invoke it. If invoked, there would be
no way for an attacker to pass parameters to that executable.
- - -This vulnerability does not provide any way for an attacker to put
a program of their choice onto another user's system.
Risk Rating:
============
Moderate
Patch Availability:
===================
- A patch is available to fix this vulnerability. Please read the
Security Bulletin at
http://www.microsoft.com/technet/security/bulletin/ms02-068.asp
for information on obtaining this patch.
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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.
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Reprinted with permission of Microsoft Corporation.
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For additional information or assistance, please contact the HELP Desk
by
telephone or Not Protectively Marked information may be sent via EMail
to:
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Tel: 020 7821 1330 Ext 4511
Fax: 020 7821 1686
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UNIRAS wishes to acknowledge the contributions of Microsoft for the
information
contained in this Briefing.
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This Briefing contains the information released by the original author.
Some
of the information may have changed since it was released. If the
vulnerability
affects you, it may be prudent to retrieve the advisory from the
canonical site
to ensure that you receive the most current information concerning that
problem.
Reference to any specific commercial product, process, or service by
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its endorsement, recommendation, or favouring by UNIRAS or NISCC. The
views
and opinions of authors expressed within this notice shall not be used
for
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Neither UNIRAS or NISCC shall also accept responsibility for any errors
or omissions contained within this briefing notice. In particular, they
shall
not be liable for any loss or damage whatsoever, arising from or in
connection
with the usage of information contained within this notice.
UNIRAS is a member of the Forum of Incident Response and Security Teams
(FIRST)
and has contacts with other international Incident Response Teams (IRTs)
in
order to foster cooperation and coordination in incident prevention, to
prompt
rapid reaction to incidents, and to promote information sharing amongst
its
members and the community at large.
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<End of UNIRAS Briefing>
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