How Can I Troubleshoot Certain Web sites and HTML Help features may not work after you install security update 896358 or security update 890175 Problems

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

folder

A 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/research

http://help.wingtiptoys.com/sales

Example 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.reg

Save 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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