[NT] Cumulative Security Update for Internet Explorer (MS08-024)



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Cumulative Security Update for Internet Explorer (MS08-024)
------------------------------------------------------------------------


SUMMARY

This security update resolves one privately reported vulnerability. The
vulnerability could allow remote code execution if a user viewed a
specially crafted Web page using Internet Explorer. Users whose accounts
are configured to have fewer user rights on the system could be less
impacted than users who operate with administrative user rights.

The security update is rated Critical for all supported releases of
Internet Explorer. For more information, see the subsection, Affected and
Non-Affected Software, in this section.

DETAILS

Affected Software:
Operating System - Component - Maximum Security Impact - Aggregate
Severity Rating - Bulletins Replaced by This Update
Internet Explorer 5.01 and Internet Explorer 6 Service Pack 1
* Microsoft Windows 2000 Service Pack 4 -
<http://www.microsoft.com/downloads/details.aspx?FamilyId=B051AE04-FE81-440D-9136-D6B239CA954E> Microsoft Internet Explorer 5.01 Service Pack 4 - Remote Code Execution - Critical - MS08-010
* Microsoft Windows 2000 Service Pack 4 -
<http://www.microsoft.com/downloads/details.aspx?FamilyId=75D2DC78-E3A4-4FF6-9E2D-BF1935003E8E> Microsoft Internet Explorer 6 Service Pack 1 - Remote Code Execution - Critical - MS08-010

Internet Explorer 6
* Windows XP Service Pack 2 - Microsoft Internet Explorer 6 - Remote Code
Execution - Critical - MS08-010
* Windows XP Professional x64 Edition and Windows XP Professional x64
Edition Service Pack 2 -
<http://www.microsoft.com/downloads/details.aspx?FamilyId=36C641AD-953F-4B09-BA1C-9C383295E180> Microsoft Internet Explorer 6 - Remote Code Execution - Critical - MS08-010
* Windows Server 2003 Service Pack 1 and Windows Server 2003 Service Pack
2 -
<http://www.microsoft.com/downloads/details.aspx?FamilyId=85BEACC0-8CA2-4DED-9C24-23348D05C735> Microsoft Internet Explorer 6 - Remote Code Execution - Critical - MS08-010
* Windows Server 2003 x64 Edition and Windows Server 2003 x64 Edition
Service Pack 2 -
<http://www.microsoft.com/downloads/details.aspx?FamilyId=5EBB5EF9-615F-4CAB-BAC5-6F45F1B94952> Microsoft Internet Explorer 6 - Remote Code Execution - Critical - MS08-010
* Windows Server 2003 with SP1 for Itanium-based Systems and Windows
Server 2003 with SP2 for Itanium-based Systems -
<http://www.microsoft.com/downloads/details.aspx?FamilyId=63DA8040-FDA2-42C7-8543-26AD6F9811F2> Microsoft Internet Explorer 6 - Remote Code Execution - Critical - MS08-010

Internet Explorer 7
* Windows XP Service Pack 2 - Windows Internet Explorer 7 - Remote Code
Execution - Critical - MS08-010
* Windows XP Professional x64 Edition and Windows XP Professional x64
Edition Service Pack 2 -
<http://www.microsoft.com/downloads/details.aspx?FamilyId=E771EFE8-8881-4F23-B5B0-15651A390BA9> Windows Internet Explorer 7 - Remote Code Execution - Critical - MS08-010
* Windows Server 2003 Service Pack 1 and Windows Server 2003 Service Pack
2 -
<http://www.microsoft.com/downloads/details.aspx?FamilyId=9364BF81-6505-4788-958D-A4BD29DC98AD> Windows Internet Explorer 7 - Remote Code Execution - Critical - MS08-010
* Windows Server 2003 x64 Edition and Windows Server 2003 x64 Edition
Service Pack 2 -
<http://www.microsoft.com/downloads/details.aspx?FamilyId=9ACD2A03-5530-49C8-9EA1-0BFAF259700D> Windows Internet Explorer 7 - Remote Code Execution - Critical - MS08-010
* Windows Server 2003 with SP1 for Itanium-based Systems and Windows
Server 2003 with SP2 for Itanium-based Systems -
<http://www.microsoft.com/downloads/details.aspx?FamilyId=A9E406AA-33E2-49B8-AB54-4A7328E46147> Windows Internet Explorer 7 - Remote Code Execution - Critical - MS08-010
* Windows Vista and Windows Vista Service Pack 1 -
<http://www.microsoft.com/downloads/details.aspx?FamilyId=75A05D3A-92A0-4A00-95D4-E2B2F6755180> Windows Internet Explorer 7 - Remote Code Execution - Critical - MS08-010
* Windows Vista x64 Edition and Windows Vista x64 Edition Service Pack 1
-
<http://www.microsoft.com/downloads/details.aspx?FamilyId=D4E24966-6530-463A-9EE2-F6A9D000F998> Windows Internet Explorer 7 - Remote Code Execution - Critical - MS08-010
* Windows Server 2008 for 32-bit Systems -
<http://www.microsoft.com/downloads/details.aspx?FamilyId=295CF8F2-265E-4570-B708-21033337FE05> Windows Internet Explorer 7 - Remote Code Execution - Critical - Not Applicable
* Windows Server 2008 for x64-based Systems -
<http://www.microsoft.com/downloads/details.aspx?FamilyId=E57B4D94-19AD-4818-8311-A3F94BE01A4B> Windows Internet Explorer 7 - Remote Code Execution - Critical - Not Applicable
* Windows Server 2008 for Itanium-based Systems -
<http://www.microsoft.com/downloads/details.aspx?FamilyId=93E9F52A-C7D0-4033-9C12-740665A219AF> Windows Internet Explorer 7 - Remote Code Execution - Critical - Not Applicable

Data Stream Handling Memory Corruption Vulnerability - CVE-2008-1085
A remote code execution vulnerability exists in Internet Explorer because
of the way that it processes data streams. An attacker could exploit the
vulnerability by constructing a specially crafted Web page. When a user
views the Web page, the vulnerability could allow remote code execution.
An attacker who successfully exploited this vulnerability could gain the
same user rights as the logged on user.

CVE Information:
<http://www.cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2008-1085>
CVE-2008-1085

Mitigating Factors for Data Stream Handling Memory Corruption
Vulnerability - CVE-2008-1085
* In a Web-based attack scenario, an attacker could host a Web site that
contains a Web page that is used to exploit this vulnerability. In
addition, compromised Web sites and Web sites that accept or host
user-provided content or advertisements could contain specially crafted
content that could exploit this vulnerability. In all cases, however, an
attacker would have no way to force users to visit these Web sites.
Instead, an attacker would have to convince users to visit the Web site,
typically by getting them to click a link in an e-mail or Instant
Messenger message that takes users to the attacker's Web site.

* An attacker who successfully exploited this vulnerability could gain
the same user rights as the local user. Users whose accounts are
configured to have fewer user rights on the system could be less impacted
than users who operate with administrative user rights.

* By default, all supported releases of Microsoft Outlook and Microsoft
Outlook Express open HTML e-mail messages in the Restricted sites zone.
The Restricted sites zone helps reduce the number of successful attacks
that exploit this vulnerability by preventing Active Scripting and ActiveX
controls from being used when reading HTML e-mail. However, if a user
clicks on a link within an e-mail they could still be vulnerable to this
issue through the Web-based attack scenario.

Note It cannot be ruled out that this vulnerability could be used in an
exploit without Active Scripting. However, using Active Scripting
significantly increases the chances of a successful exploit. As a result,
this vulnerability has been given a severity rating of Critical on Windows
Server 2003 and Windows Server 2008.

Workarounds for Data Stream Handling Memory Corruption Vulnerability -
CVE-2008-1085
Workaround refers to a setting or configuration change that does not
correct the underlying vulnerability but would help block known attack
vectors before you apply the update. Microsoft has tested the following
workarounds and states in the discussion whether a workaround reduces
functionality:

* Read e-mail messages in plain text format to help protect yourself from
the HTML e-mail attack vector

You can help protect yourself against this vulnerability by changing your
e-mail settings to read e-mail messages in plain text using Outlook 2002
and later, Outlook Express 6 and later, or Windows Mail. For information
in Outlook, search plain text in Help and review Read messages in plain
text. In Outlook Express, search plain text in Help and review
Reducing your risk of getting e-mail viruses. In Windows Mail, search
plain text in Help and review Security and privacy in Windows Mail.

Impact of workaround. E-mail messages that are viewed in plain text format
will not contain pictures, specialized fonts, animations, or other rich
content. Additionally:

* The changes are applied to the preview pane and to open messages.

* Pictures become attachments so that they are not lost.

* Because the message is still in Rich Text or HTML format in the store,
the object model (custom code solutions) may behave unexpectedly.

FAQ for Data Stream Handling Memory Corruption Vulnerability -
CVE-2008-1085
What is the scope of the vulnerability?
This is a remote code execution vulnerability. An attacker who
successfully exploited this vulnerability could gain the same user rights
as the logged on user.

If a user is logged on with administrative user rights, an attacker who
successfully exploited this vulnerability could take complete control of
an affected system. An attacker could then install programs; view, change,
or delete data; or create new accounts with full user rights. Users whose
accounts are configured to have fewer user rights on the system could be
less impacted than users who operate with administrative user rights.

What causes the vulnerability?
When Internet Explorer processes specially crafted data streams, Internet
Explorer may corrupt system memory in such a way that an attacker could
execute arbitrary code.

What might an attacker use the vulnerability to do?
An attacker who successfully exploited this vulnerability could gain the
same user rights as the local user. Users whose accounts are configured to
have fewer user rights on the system could be less impacted than users who
operate with administrative user rights.

How could an attacker exploit the vulnerability?
An attacker could host a specially crafted Web site that is designed to
exploit this vulnerability through Internet Explorer and then convince a
user to view the Web site. This could also include compromised Web sites
and Web sites that accept or host user-provided content or advertisements.
These Web sites could contain specially crafted content that could exploit
this vulnerability. In all cases, however, an attacker would have no way
to force users to visit these Web sites. Instead, an attacker would have
to convince users to visit the Web site, typically by getting them to
click a link in an e-mail message or in an Instant Messenger message that
takes users to the attacker's Web site. It could also be possible to
display specially crafted Web content by using banner advertisements or by
using other methods to deliver Web content to affected systems.

What systems are primarily at risk from the vulnerability?
This vulnerability requires that a user be logged on and visit a Web site
for any malicious action to occur. Therefore, any systems where Internet
Explorer is used frequently, such as workstations or terminal servers, are
at the most risk from this vulnerability.

What does the update do?
The update removes the vulnerability by modifying the way that Internet
Explorer processes data streams.

When this security bulletin was issued, had this vulnerability been
publicly disclosed?
No. Microsoft received information about this vulnerability through
responsible disclosure.

When this security bulletin was issued, had Microsoft received any reports
that this vulnerability was being exploited?
No. Microsoft had not received any information to indicate that this
vulnerability had been publicly used to attack customers and had not seen
any examples of proof of concept code published when this security
bulletin was originally issued.


ADDITIONAL INFORMATION

The information has been provided by Microsoft Product Security.
The original article can be found at:
<http://www.microsoft.com/technet/security/Bulletin/MS08-024.mspx>
http://www.microsoft.com/technet/security/Bulletin/MS08-024.mspx



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