Summary: After you install security update 896358 or security update
890175, you may experience one or more of the following symptoms:
Certain kinds of Web-based programs may not work correctly.
For example, a table of contents in HTML Help may no longer work.Certain HTML Help features may not work when you open a
.chm file from a remote location. For example, the Related Topics feature may
not work.Note This article contains information that is supplemental to the
following Microsoft Knowledge Base articles:896358 MS05-026: A vulnerability in HTML
Help could allow remote code execution
890175 MS05-001:
Vulnerability in HTML Help could allow code execution
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Method for Advanced Users
Warning The symptoms are an expected and intended effect of installing
the security updates. This section provides examples for administrators who
must re-enable the HTML Help ActiveX control for business-critical programs.
The workarounds may make the computer more vulnerable to the threats the
security updates address. The safest course is not to use the registry
workarounds. If you must use workarounds, set the registry values to be as
restrictive as possible.
Important This section, method, or task contains steps that tell you how to modify the registry. However, serious problems might occur if you modify the registry incorrectly. Therefore, make sure that you follow these steps carefully. For added protection, back up the registry before you modify it. Then, you can restore the registry if a problem occurs. For more information about how to back up and restore the registry, click the following article number to view the article in the Microsoft Knowledge Base: 322756 How to back up and restore the registry in Windows
The first of the following examples is the most
restrictive example. The next examples are successively less restrictive.
Example 1: Use the UrlAllowList entry to enable specific URLs
Warning Include only URLs for sites that you trust.
The .reg
file in this example re-enables hosting of the HTML Help ActiveX control in the
following remote content:
Any .chm files that are in the \\productmanuals\helpfiles
folderA Web application that located at
http://www.wingtiptoys.com/help.Paste the following text in a text editor such as Notepad. Then,
save the file by using the .reg file name extension.
REGEDIT4
[HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\HTMLHelp]
[HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\HTMLHelp\1.x\HHRestrictions]
"UrlAllowList"="\\\\productmanuals\\helpfiles;http://www.wingtiptoys.com/help/"You cannot use wildcard characters in the URL string of any site that is
added to the UrlAllowList registry key. For example, you cannot use the
following URL string: "UrlAllowList"="http://*.wingtiptoys.com"However, you can use the following URL string:"UrlAllowList"="http://help.wingtiptoys.com" This string lets the following sites host the HTML Help ActiveX
control:
http://help.wingtiptoys.com/researchhttp://help.wingtiptoys.com/salesExample 2: Use the MaxAllowedZone entry to enable a security zone
Warning The MaxAllowedZone entry enables all sites in a particular zone.
Using the UrlAllowList entry may be safer. If you must use the MaxAllowedZone
entry, set the value no higher than is required. If you set the MaxAllowedZone
value to 3 or higher, you expose systems to attack from the Internet.
Note By default, the value for the MaxAllowedZone entry is set to
zero. The following table summarizes how different entries are interpreted by
the value for the MaxAllowedZone entry.
MaxAllowedZoneLocal Machine zoneLocal
intranet zoneTrusted sites zoneInternet
zoneRestricted sites zone0AllowedBlockedBlockedBlockedBlocked1AllowedAllowedBlockedBlockedBlocked2AllowedAllowedAllowedBlockedBlocked3AllowedAllowedAllowedAllowedBlocked4AllowedAllowedAllowedAllowedAllowedPaste the following text in a text editor such as Notepad.
Then, save the file by using the .reg file name extension. This .reg file lets
all content in the Intranet zone host the HTML Help ActiveX control.
REGEDIT4
[HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\HTMLHelp]
[HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\HTMLHelp\1.x\HHRestrictions]
"MaxAllowedZone"=dword:00000001
Example 3: Use the UrlAllowList entry and the MaxAllowedZone entry
Warning The MaxAllowedZone entry enables all sites in a particular zone.
Using the UrlAllowList entry may be safer. If you must use the MaxAllowedZone
entry, set the value no higher than is required. If you set the MaxAllowedZone
value to 3 or higher, you expose systems to attack from the
Internet.
Paste the following text in a text editor such as Notepad.
Then, save the file by using the .reg file name extension. The following .reg
file lets all content in the Intranet zone host the HTML Help ActiveX control.
This .reg file also lets two Internet sites host the control.
REGEDIT4
[HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\HTMLHelp]
[HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\HTMLHelp\1.x\HHRestrictions]
"MaxAllowedZone"=dword:00000001
[HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\HTMLHelp\1.x\HHRestrictions]
"UrlAllowList"="http://www.wingtiptoys.com/;http://www.contoso.com/"
Deploying the registry keys across a domain
We recommend that you use Group Policy to deploy the settings that
are mentioned in the examples in this article as startup scripts. You can also
deploy these settings as logon scripts. However, this method is less desirable
because of permissions constraints.
The following steps are an example
of how to deploy the settings in Example 1 as a Group Policy startup script.
Paste the following text into a text editor such as
Notepad:
REGEDIT4
[HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\HTMLHelp]
[HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\HTMLHelp\1.x\HHRestrictions]
"UrlAllowList"="http://myintranetapplication/help/helpfiles;http://www.wingtiptoys.com/help/helpdocuments"Save the file as a .reg file. Name the file
AllowTrustedSites.reg.Paste the following text into a text editor such as
Notepad:REGEDIT.EXE /S AllowTrustedSites.regSave the file as a batch file. Name the file
AllowTrustedSites.bat.Import the batch file into the Group Policy object (GPO).
To do this, follow these steps:Paste the batch file that you created in step 4 and the
.reg file that you created in step 2 to the \\DomainName\SysVol\DomainName\Policies\GUID of the selected GPO\Machine\Scripts\Startup folder. On the computer on which you want to run the Group
Policy object, click Start, click Run, type
dsa.msc, and then click OK.Right-click your domain, and then click
Properties.Click Group Policy, and then click
New.Type the name that you want to use for this policy, and
then press ENTER.Click Edit.Expand Computer Configuration, expand
Windows Settings, and then click Scripts
(Startup/Shutdown). In the right panel, double-click
Startup, and then click Add.Locate and then click the batch file that you created
in step 4.Click Add.Click OK, click Yes,
and then click OK two times.
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