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Cumulative Security Update for Internet Explorer (MS07-069)
------------------------------------------------------------------------
SUMMARY
This critical security update resolves four privately reported
vulnerabilities. The most serious security impact 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.
DETAILS
Affected Software:
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=B3BD16EA-5D69-4AE3-84B3-AB773052CEEB> Microsoft Internet Explorer 5.01 Service Pack 4 - Remote Code Execution - Critical - MS07-057
* Microsoft Windows 2000 Service Pack 4 -
<http://www.microsoft.com/downloads/details.aspx?FamilyId=BC8EDF05-262A-4D1D-B196-4FC1A844970C> Microsoft Internet Explorer 6 Service Pack 1 - Remote Code Execution - Critical - MS07-057
Internet Explorer 6
* Windows XP Service Pack 2 -
<http://www.microsoft.com/downloads/details.aspx?FamilyId=6E4EBAFC-34C3-4DC7-B712-152C611D3F0A> Microsoft Internet Explorer 6 - Remote Code Execution - Critical - MS07-057
* Windows XP Professional x64 Edition and Windows XP Professional x64
Edition Service Pack 2 -
<http://www.microsoft.com/downloads/details.aspx?FamilyId=F5A5AF23-30FB-4E47-94BD-3B05B55C92F2> Microsoft Internet Explorer 6 - Remote Code Execution - Critical - MS07-057
* Windows Server 2003 Service Pack 1 and Windows Server 2003 Service Pack
2 -
<http://www.microsoft.com/downloads/details.aspx?FamilyId=BF466060-A585-4C2E-A48D-70E080C3BBE7> Microsoft Internet Explorer 6 - Remote Code Execution - Moderate - MS07-057
* Windows Server 2003 x64 Edition and Windows Server 2003 x64 Edition
Service Pack 2 -
<http://www.microsoft.com/downloads/details.aspx?FamilyId=074697F2-18C8-4521-BBF7-1D0E7395D27D> Microsoft Internet Explorer 6 - Remote Code Execution - Moderate - MS07-057
* 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=B3F390A6-0361-4553-B627-5E7AD6BF5055> Microsoft Internet Explorer 6 - Remote Code Execution - Moderate - MS07-057
Internet Explorer 7
Windows XP Service Pack 2-
<http://www.microsoft.com/downloads/details.aspx?FamilyId=B15A6506-02DD-43C2-AEF4-E10C1C76EE97> Windows Internet Explorer 7 - Remote Code Execution - Critical - MS07-057
* Windows XP Professional x64 Edition and Windows XP Professional x64
Edition Service Pack 2 -
<http://www.microsoft.com/downloads/details.aspx?FamilyId=C092A6BB-8E62-4D90-BDB1-5F3A15968F75> Windows Internet Explorer 7 - Remote Code Execution - Critical - MS07-057
* Windows Server 2003 Service Pack 1 and Windows Server 2003 Service Pack
2 -
<http://www.microsoft.com/downloads/details.aspx?FamilyId=34759C10-16A5-42A2-974D-9D532FB5A0A7> Windows Internet Explorer 7 - Remote Code Execution - Moderate - MS07-057
* Windows Server 2003 x64 Edition and Windows Server 2003 x64 Edition
Service Pack 2 -
<http://www.microsoft.com/downloads/details.aspx?FamilyId=7DCCCE5A-7562-448B-A345-CF1CC758E35C> Windows Internet Explorer 7 - Remote Code Execution - Moderate - MS07-057
* 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=8414F3FB-216A-4D46-B590-4C1F304DFF91> Windows Internet Explorer 7 - Remote Code Execution - Moderate - MS07-057
* Windows Vista -
<http://www.microsoft.com/downloads/details.aspx?FamilyId=26D303DA-BB2E-4555-96F1-BECB0E277341> Windows Internet Explorer 7 - Remote Code Execution - Critical - MS07-057
* Windows Vista x64 Edition -
<http://www.microsoft.com/downloads/details.aspx?FamilyId=C5E88E0B-A4C2-4690-91D9-326800030A16> Windows Internet Explorer 7 - Remote Code Execution - Critical - MS07-057
Uninitialized Memory Corruption Vulnerability - CVE-2007-3902
A remote code execution vulnerability exists in the way Internet Explorer
accesses an object that has not been correctly initialized or that has
been deleted. 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.
Mitigating Factors for Uninitialized Memory Corruption Vulnerability
Mitigation refers to a setting, common configuration, or general
best-practice, existing in a default state, that could reduce the severity
of exploitation of a vulnerability. The following mitigating factors may
be helpful in your situation:
* 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 message 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 versions of Microsoft Outlook and Microsoft
Outlook Express open HTML e-mail messages in the Restricted sites zone.
The Restricted sites zone helps mitigate attacks that could try to exploit
this vulnerability by preventing Active Scripting and ActiveX controls
from being used when reading HTML e-mail messages. However, if a user
clicks a link in an e-mail message, the user could still be vulnerable to
this issue through the Web-based attack scenario.
* By default, Internet Explorer on Windows Server 2003 runs in a
restricted mode that is known as Enhanced Security Configuration. This
mode sets the security level for the Internet zone to High. This is a
mitigating factor for Web sites that you have not added to the Internet
Explorer Trusted sites zone. See the FAQ subsection of this vulnerability
section for more information about Internet Explorer Enhanced Security
Configuration.
Uninitialized Memory Corruption Vulnerability - CVE-2007-3903
A remote code execution vulnerability exists in the way Internet Explorer
accesses an object that has not been correctly initialized or that has
been deleted. 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.
Mitigating Factors for Uninitialized Memory Corruption Vulnerability
Mitigation refers to a setting, common configuration, or general
best-practice, existing in a default state, that could reduce the severity
of exploitation of a vulnerability. The following mitigating factors may
be helpful in your situation:
* 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 message 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 versions of Microsoft Outlook and Microsoft
Outlook Express open HTML e-mail messages in the Restricted sites zone.
The Restricted sites zone helps reduce attacks that could try to exploit
this vulnerability by preventing Active Scripting and ActiveX controls
from being used when reading HTML e-mail messages. However, if a user
clicks a link in an e-mail message, the user could still be vulnerable to
this issue through the Web-based attack scenario.
* By default, Internet Explorer on Windows Server 2003 runs in a
restricted mode that is known as Enhanced Security Configuration. This
mode sets the security level for the Internet zone to High. This is a
mitigating factor for Web sites that you have not added to the Internet
Explorer Trusted sites zone. See the FAQ subsection of this vulnerability
section for more information about Internet Explorer Enhanced Security
Configuration.
Uninitialized Memory Corruption Vulnerability - CVE-2007-5344
A remote code execution vulnerability exists in the way Internet Explorer
accesses an object that has not been correctly initialized or that has
been deleted. 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.
Mitigating Factors for Uninitialized Memory Corruption Vulnerability
Mitigation refers to a setting, common configuration, or general
best-practice, existing in a default state, that could reduce the severity
of exploitation of a vulnerability. The following mitigating factors may
be helpful in your situation:
* 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 message 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 versions of Microsoft Outlook and Microsoft
Outlook Express open HTML e-mail messages in the Restricted sites zone.
The Restricted sites zone helps reduce attacks that could try to exploit
this vulnerability by preventing Active Scripting and ActiveX controls
from being used when reading HTML e-mail messages. However, if a user
clicks a link in an e-mail message, the user could still be vulnerable to
this issue through the Web-based attack scenario.
* By default, Internet Explorer on Windows Server 2003 runs in a
restricted mode that is known as Enhanced Security Configuration. This
mode sets the security level for the Internet zone to High. This is a
mitigating factor for Web sites that you have not added to the Internet
Explorer Trusted sites zone. See the FAQ subsection of this vulnerability
section for more information about Internet Explorer Enhanced Security
Configuration.
DHTML Object Memory Corruption Vulnerability - CVE-2007-5347
A remote code execution vulnerability exists in the way Internet Explorer
displays a Web page that contains certain unexpected method calls to HTML
objects. As a result, system memory may be corrupted in such a way that an
attacker could execute arbitrary code if a user visited a specially
crafted Web site. An attacker who successfully exploited this
vulnerability could gain the same user rights as the logged on user.
Mitigating Factors for DHTML Object Memory Corruption Vulnerability
Mitigation refers to a setting, common configuration, or general
best-practice, existing in a default state, that could reduce the severity
of exploitation of a vulnerability. The following mitigating factors may
be helpful in your situation:
* 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 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 versions of Microsoft Outlook and Microsoft
Outlook Express open HTML e-mail messages in the Restricted sites zone.
The Restricted sites zone helps reduce attacks that could try to 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 message, the user could still be vulnerable to this
issue through the Web-based attack scenario.
* By default, Internet Explorer on Windows Server 2003 runs in a
restricted mode that is known as Enhanced Security Configuration. This
mode sets the security level for the Internet zone to High. This is a
mitigating factor for Web sites that you have not added to the Internet
Explorer Trusted sites zone. See the FAQ subsection of this vulnerability
section for more information about Internet Explorer Enhanced Security
Configuration.
Workarounds
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:
* Configure Internet Explorer to prompt before running Active Scripting
or to disable Active Scripting in the Internet and Local intranet security
zone
You can help protect against this vulnerability by changing your settings
to prompt before running Active Scripting or to disable Active Scripting
in the Internet and Local intranet security zone. To do this, follow these
steps:
1. In Internet Explorer, click Internet Options on the Tools menu.
2. Click the Security tab.
3. Click Internet, and then click Custom Level.
4. Under Settings, in the Scripting section, under Active Scripting, click
Prompt or Disable, and then click OK.
5. Click Local intranet, and then click Custom Level.
6. Under Settings, in the Scripting section, under Active Scripting, click
Prompt or Disable, and then click OK.
7. Click OK two times to return to Internet Explorer.
Note Disabling Active Scripting in the Internet and Local intranet
security zones may cause some Web sites to work incorrectly. If you have
difficulty using a Web site after you change this setting, and you are
sure the site is safe to use, you can add that site to your list of
trusted sites. This will allow the site to work correctly.
Add sites that you trust to the Internet Explorer Trusted sites zone
After you set Internet Explorer to require a prompt before it runs ActiveX
controls and Active Scripting in the Internet zone and in the Local
intranet zone, you can add sites that you trust to the Internet Explorer
Trusted sites zone. This will allow you to continue to use trusted Web
sites exactly as you do today, while helping to protect you from this
attack on untrusted sites. We recommend that you add only sites that you
trust to the Trusted sites zone.
To do this, follow these steps:
1. In Internet Explorer, click Tools, click Internet Options, and then
click the Security tab.
2. In the Select a Web content zone to specify its current security
settings box, click Trusted Sites, and then click Sites.
3. If you want to add sites that do not require an encrypted channel,
click to clear the Require server verification (https:) for all sites in
this zone check box.
4. In the Add this Web site to the zone box, type the URL of a site that
you trust, and then click Add.
5. Repeat these steps for each site that you want to add to the zone.
6. Click OK two times to accept the changes and return to Internet
Explorer.
Note Add any sites that you trust not to take malicious action on your
system. Two in particular that you may want to add are
"*.windowsupdate.microsoft.com" and *.update.microsoft.com (without the
quotation marks). These are the sites that will host the update, and it
requires an ActiveX Control to install the update.
Impact of Workaround: There are side effects to prompting before running
Active Scripting. Many Web sites that are on the Internet or on an
intranet use Active Scripting to provide additional functionality. For
example, an online e-commerce site or banking site may use Active
Scripting to provide menus, ordering forms, or even account statements.
Prompting before running Active Scripting is a global setting that affects
all Internet and intranet sites. You will be prompted frequently when you
enable this workaround. For each prompt, if you feel you trust the site
that you are visiting, click Yes to run Active Scripting. If you do not
want to be prompted for all these sites, use the steps outlined in "Add
sites that you trust to the Internet Explorer Trusted sites zone .
Set Internet and Local intranet security zone settings to High to prompt
before running ActiveX Controls and Active Scripting in these zones
You can help protect against this vulnerability by changing your settings
for the Internet security zone to prompt before running ActiveX controls
and Active Scripting. You can do this by setting your browser security to
High.
To raise the browsing security level in Microsoft Internet Explorer,
follow these steps:
1. On the Internet Explorer Tools menu, click Internet Options.
2. In the Internet Options dialog box, click the Security tab, and then
click the Internet icon.
3. Under Security level for this zone, move the slider to High. This sets
the security level for all Web sites you visit to High.
Note If no slider is visible, click Default Level, and then move the
slider to High.
Note Setting the level to High may cause some Web sites to work
incorrectly. If you have difficulty using a Web site after you change this
setting, and you are sure the site is safe to use, you can add that site
to your list of trusted sites. This will allow the site to work correctly
even with the security setting set to High.
Impact of workaround: There are side effects to prompting before running
ActiveX Controls and Active Scripting. Many Web sites that are on the
Internet or on an intranet use ActiveX or Active Scripting to provide
additional functionality. For example, an online e-commerce site or
banking site may use ActiveX Controls to provide menus, ordering forms, or
even account statements. Prompting before running ActiveX Controls or
Active Scripting is a global setting that affects all Internet and
intranet sites. You will be prompted frequently when you enable this
workaround. For each prompt, if you feel you trust the site that you are
visiting, click Yes to run ActiveX Controls or Active Scripting. If you do
not want to be prompted for all these sites, use the steps outlined in
"Add sites that you trust to the Internet Explorer Trusted sites zone .
Add sites that you trust to the Internet Explorer Trusted sites zone
After you set Internet Explorer to require a prompt before it runs ActiveX
controls and Active Scripting in the Internet zone and in the Local
intranet zone, you can add sites that you trust to the Internet Explorer
Trusted sites zone. This will allow you to continue to use trusted Web
sites exactly as you do today, while helping to protect you from this
attack on untrusted sites. We recommend that you add only sites that you
trust to the Trusted sites zone.
To do this, follow these steps:
1. In Internet Explorer, click Tools, click Internet Options, and then
click the Security tab.
2. In the Select a Web content zone to specify its current security
settings box, click Trusted Sites, and then click Sites.
3. If you want to add sites that do not require an encrypted channel,
click to clear the Require server verification (https:) for all sites in
this zone check box.
4. In the Add this Web site to the zone box, type the URL of a site that
you trust, and then click Add.
5. Repeat these steps for each site that you want to add to the zone.
6. Click OK two times to accept the changes and return to Internet
Explorer.
Note Add any sites that you trust not to take malicious action on your
computer. Two in particular that you may want to add are
*.windowsupdate.microsoft.com and *.update.microsoft.com. These are the
sites that will host the update, and it requires an ActiveX Control to
install the update.
Impact of Workaround: There are side effects to prompting before running
ActiveX Controls and Active Scripting. Many Web sites that are on the
Internet or on an intranet use ActiveX or Active Scripting to provide
additional functionality. For example, an online e-commerce site or
banking site may use ActiveX Controls to provide menus, ordering forms, or
even account statements. Prompting before running ActiveX Controls or
Active Scripting is a global setting that affects all Internet and
intranet sites. You will be prompted frequently when you enable this
workaround. For each prompt, if you feel you trust the site that you are
visiting, click Yes to run ActiveX Controls or Active Scripting. If you do
not want to be prompted for all these sites, use the steps outlined in
"Add sites that you trust to the Internet Explorer Trusted sites zone .
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/MS07-069.mspx>
http://www.microsoft.com/technet/security/bulletin/MS07-069.mspx
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