msie.fixes.4.99.txt

`Date: Wed, 21 Apr 1999 18:13:39 -0700  
From: [email protected]  
To: [email protected]  
Subject: Microsoft Security Bulletin (MS99-011)  
  
The following is a Security Bulletin from the Microsoft Product Security  
Notification Service.  
  
Please do not reply to this message, as it was sent from an unattended  
mailbox.  
********************************  
  
Microsoft Security Bulletin (MS99-011)  
--------------------------------------  
  
Patch Available for "DHTML Edit" Vulnerability  
  
Originally Posted: April 21, 1999  
  
Summary  
=======  
Microsoft has released a patch that eliminates a vulnerability in an ActiveX  
control that is distributed in Internet Explorer 5 and downloadable for  
Internet Explorer 4.0. The vulnerability could allow a malicious web site  
operator to read information that a user had loaded into the control, and it  
also could allow files with known names to be copied from the user's local  
hard drive.  
  
A fully supported patch is available to eliminate this vulnerability and  
Microsoft recommends that affected customers download and install it, if  
appropriate.  
  
Issue  
=====  
The DHTML Edit control is an ActiveX control that is distributed with  
Internet Explorer 5 and can be downloaded for use in Internet Explorer 4.0.  
The control enables users to edit HTML text and see a faithful rendition of  
how the text would look in the browser. There are two versions of the  
control: a more powerful version that cannot be invoked by a web site  
because it includes file access and other features, and a "safe for  
scripting" version that has restricted functionality and is intended for use  
by web sites.  
  
The root cause of the vulnerability lies in the fact that a web site that  
hosts the "safe for scripting" version of the control is able to upload any  
data entered into the control. A malicious web site operator could trick a  
user into entering sensitive data into a DHTML Edit control hosted on a web  
page from the operator's site, and then upload the data. In addition, if the  
malicious web site operator knows the name of a file on the user's local  
drive, it is possible for the operator to programmatically load the file  
into the control and then upload it.  
  
The patch works by allowing a web site to load data from the control only if  
it is in the site's domain. While there are no reports of customers being  
adversely affected by this vulnerability, Microsoft is proactively releasing  
this patch to allow customers to take appropriate action to protect  
themselves against it.  
  
Affected Software Versions  
==========================  
- Microsoft Internet Explorer 5 on Windows 95, Windows 98, and  
Windows NT 4.0. Internet Explorer 5 on other platforms is  
not affected.  
- Microsoft Internet Explorer 4.0 on Windows 95, Windows 98 and  
the x86 version of Windows NT 4.0. Internet Explorer 4.0 on  
other platforms, including the Alpha version of Windows NT 4.0,  
is not affected.  
  
Note: The DHTML Edit control is included by default in Internet Explorer 5.  
It is not included by default in Internet Explorer 4.0, but can be  
downloaded and installed. Internet Explorer 4.0 customers who are unsure  
whether they have installed the control should see What Customers Should Do.  
  
  
What Microsoft is Doing  
=======================  
Microsoft has released patches that fix the problem identified. The patches  
are available for download from the sites listed below in What Customers  
Should Do.  
  
Microsoft also has sent this security bulletin to customers  
subscribing to the Microsoft Product Security Notification Service.  
See http://www.microsoft.com/security/services/bulletin.asp for  
more information about this free customer service.  
  
Microsoft has published the following Knowledge Base (KB) article on this  
issue:  
- Microsoft Knowledge Base (KB) article Q226326,  
Update Available for 'DHTML Edit' Security Issue,  
http://support.microsoft.com/support/kb/articles/q226/3/26.asp.  
(Note: It might take 24 hours from the original posting of this  
bulletin for the KB article to be visible in the Web-based  
Knowledge Base.)  
  
What Customers Should Do  
========================  
Microsoft highly recommends that customers determine whether they are  
potentially affected by the vulnerability:  
- All copies of Internet Explorer 5 contain the DHTML Edit  
control, so all Internet Explorer 5 customers are potentially  
affected by the vulnerability.  
- The only Internet Explorer 4.0 users who are potentially  
affected by the vulnerability are those who have downloaded  
and installed the DHTML Edit control. If this has been done,  
the file dhtmled.ocx will be present on the hard drive. By  
default, this file will be stored in the folder  
C:\Program Files\Common Files\Microsoft Shared\Triedit\.  
  
Customers who are potentially affected by the vulnerability should  
evaluate the degree of risk that this vulnerability poses to their  
systems and determine whether to download and install the patch.  
The patch can be found at  
http://www.microsoft.com/windows/ie/security/dhtml_edit.asp.  
  
More Information  
================  
Please see the following references for more information related to this  
issue.  
- Microsoft Security Bulletin MS99-011,  
Patch Available for DHTML Edit Vulnerability.  
(The Web-posted version of this bulletin),  
http://www.microsoft.com/security/bulletins/ms99-011.asp.  
- Microsoft Knowledge Base (KB) article Q226326,  
Update Available for 'DHTML Edit' Security Issue,  
http://support.microsoft.com/support/kb/articles/q226/3/26.asp.  
(Note: It might take 24 hours from the original posting of  
this bulletin for the KB article to be visible in the Web-based  
Knowledge Base.)  
  
Obtaining Support on this Issue  
===============================  
If you require technical assistance with this issue, please  
contact Microsoft Technical Support. For information on contacting  
Microsoft Technical Support, please see  
http://support.microsoft.com/support/contact/default.asp.  
  
Acknowledgments  
===============  
Microsoft acknowledges Juan Carlos Cuartango of Spain for  
discovering this vulnerability and reporting it to us.  
  
Revisions  
=========  
- April 21, 1999: Bulletin Created.  
  
  
For additional security-related information about Microsoft products, please  
visit http://www.microsoft.com/security  
--------------------------------------------------------------------  
  
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.  
  
(c) 1999 Microsoft Corporation. All rights reserved.  
  
*******************************************************************  
You have received this e-mail bulletin as a result of your registration  
to the Microsoft Product Security Notification Service. You may  
unsubscribe from this e-mail notification service at any time by sending  
an e-mail to [email protected]  
The subject line and message body are not used in processing the request,  
and can be anything you like.  
  
For more information on the Microsoft Security Notification Service  
please visit http://www.microsoft.com/security/bulletin.htm. For  
security-related information about Microsoft products, please visit the  
Microsoft Security Advisor web site at http://www.microsoft.com/security.  
  
---------------------------------------------------------------------------------  
  
Date: Wed, 21 Apr 1999 18:14:00 -0700  
From: [email protected]  
To: [email protected]  
Subject: Microsoft Security Bulletin (MS99-012)  
  
The following is a Security Bulletin from the Microsoft Product Security  
Notification Service.  
  
Please do not reply to this message, as it was sent from an unattended  
mailbox.  
********************************  
  
Microsoft Security Bulletin (MS99-012)  
--------------------------------------  
  
MSHTML Update Available for Internet Explorer  
  
Originally Posted: April 21, 1999  
  
Summary  
=======  
Microsoft has released an updated version of a component of Internet  
Explorer 4.0 and 5. The updated version eliminates three security  
vulnerabilities described below. It is fully supported and Microsoft  
recommends that affected customers download and install it, if appropriate.  
  
Issue  
=====  
MSHTML.DLL is the parsing engine for HTML in Internet Explorer. The  
vulnerabilities that are eliminated by the update are not related to each  
other except for the fact that all reside within the parsing engine.  
- The first vulnerability is a privacy issue involving  
the processing of the "IMG SRC" tag in HTML files. This tag  
identifies and loads image sources - image files that are  
to be displayed as part of a web page. The vulnerability  
results because the tag can be used to point to files of any  
type, rather than only image files, after which point the  
document object model methods can be used to determine information  
about them. A malicious web site operator could use this vulnerability  
to determine the size and other information about files on the  
computer of a visiting user. It would not allow files to be read or  
changed, and the malicious web site operator would need to know the  
name of each file.  
- The second vulnerability is a new variant of a previously-identified  
cross-frame security vulnerability. A particular malformed URL could  
be used to execute scripts in the security context of a different  
domain. This could allow a malicious web site operator to execute a  
script on the web site, and gain privileges on visiting users' machines  
that are normally granted only to their trusted sites.  
- The third vulnerability affects only Internet Explorer 5.0, and is a  
new variant of a previously-identified untrusted scripted paste  
vulnerability. The vulnerability would allow a malicious web site  
operator to create a particular type of web page control and paste  
into it the contents of a visiting user's clipboard.  
  
While there are no reports of customers being adversely affected by any of  
these vulnerabilities, Microsoft is proactively releasing an updated version  
of MSHTML.DLL to allow customers to take appropriate action to protect  
themselves against it.  
  
Affected Software Versions  
==========================  
- Internet Explorer 4.0 and 5 on Windows 95, Windows 98  
and Windows NT 4.0.  
  
What Microsoft is Doing  
=======================  
Microsoft has released patches that fix the problem identified. The patches  
are available for download from the sites listed below in What Customers  
Should Do.  
  
Microsoft also has sent this security bulletin to customers  
subscribing to the Microsoft Product Security Notification Service.  
See http://www.microsoft.com/security/services/bulletin.asp for  
more information about this free customer service.  
  
Microsoft has published the following Knowledge Base (KB) article on this  
issue:  
- Microsoft Knowledge Base (KB) article Q226326,  
Update Available for MSHTML Security Issues in Internet Explorer,  
http://support.microsoft.com/support/kb/articles/q226/3/26.asp.  
(Note: It might take 24 hours from the original posting of this  
bulletin for the KB article to be visible in the Web-based Knowledge  
Base.)  
  
What Customers Should Do  
========================  
Microsoft highly recommends that customers evaluate the degree of  
risk that this vulnerability poses to their systems and determine  
whether to download and install the patch. The patch can be found at  
http://www.microsoft.com/windows/ie/security/mshtml.asp.  
  
More Information  
================  
Please see the following references for more information related to this  
issue.  
- Microsoft Security Bulletin MS99-012,  
MSHTML Update Available for Internet Explorer (The Web-posted  
version of this bulletin),  
http://www.microsoft.com/security/bulletins/ms99-012.asp.  
- Microsoft Knowledge Base (KB) article Q226326,  
Update Available for MSHTML Security Issues in Internet Explorer,  
http://support.microsoft.com/support/kb/articles/q226/3/26.asp.  
- Microsoft Security Bulletin MS98-013,  
Fix available for Internet Explorer Cross Frame Navigate Vulnerability,  
http://www.microsoft.com/security/bulletins/ms98-013.asp  
- Microsoft Security Bulletin MS98-015,  
Update available for "Untrusted Scripted Paste" Issue in Microsoft  
Internet Explorer 4.01,  
http://www.microsoft.com/security/bulletins/ms98-015.asp  
  
Obtaining Support on this Issue  
===============================  
If you require technical assistance with this issue, please contact  
Microsoft Technical Support. For information on contacting Microsoft  
Technical Support, please see  
http://support.microsoft.com/support/contact/default.asp.  
  
Acknowledgments  
===============  
Microsoft acknowledges Richard M. Smith, President, Phar Lap Software, Inc.,  
for discovering the IMG SRC vulnerability, and Georgi Guninski from  
TechnoLogica Ltd., Bulgaria, for discovering the cross-frame and untrusted  
scripted paste vulnerabilities.  
  
Revisions  
=========  
- April 21, 1999: Bulletin Created.  
  
  
For additional security-related information about Microsoft products, please  
visit http://www.microsoft.com/security  
----------------------------------------------------------------------  
  
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.  
  
(c) 1999 Microsoft Corporation. All rights reserved.  
  
*******************************************************************  
You have received this e-mail bulletin as a result of your registration  
to the Microsoft Product Security Notification Service. You may  
unsubscribe from this e-mail notification service at any time by sending  
an e-mail to [email protected]  
The subject line and message body are not used in processing the request,  
and can be anything you like.  
  
For more information on the Microsoft Security Notification Service  
please visit http://www.microsoft.com/security/bulletin.htm. For  
security-related information about Microsoft products, please visit the  
Microsoft Security Advisor web site at http://www.microsoft.com/security.  
  
---------------------------------------------------------------------------------  
  
Date: Thu, 22 Apr 1999 03:28:52 -0400  
From: Russ <[email protected]>  
To: [email protected]  
Subject: Alert: Microsoft Security Bulletin (MS99-012) - MSHTML.dll  
  
Note: URLs may be line wrapped  
  
Microsoft have released a Security Bulletin;  
  
http://www.microsoft.com/security/bulletins/ms99-012.asp  
  
which covers 3 issues with the MSHTML.dll component of IE 4.0 and IE 5.0  
(MSHTML is responsible for parsing URLs).  
  
The first issue was discovered by Richard Smith of Pharlap (and not  
reported to NTBugtraq) and has to do with IMG SRC tags (which allowed  
them to load local files).  
  
The other 2 issues were discovered by Georgi Guninski and reported in  
NTBugtraq messages;  
  
Trust Zone vulnerability:  
http://ntbugtraq.ntadvice.com/default.asp?pid=36&sid=1&A2=ind9903&L=ntbu  
gtraq&F=P&S=&P=16238  
  
Cross-frame vulnerability:  
http://ntbugtraq.ntadvice.com/default.asp?pid=36&sid=1&A2=ind9904&L=ntbu  
gtraq&F=P&S=&P=1516  
  
on March 30th and April 9th respectively.  
  
It should be noted that installation of the replacement MSHTML.dll  
requires a reboot! The fix location is;  
  
http://www.microsoft.com/windows/ie/security/mshtml.asp  
  
execution of Georgi's demonstration pages (after rebooting!);  
  
Trust Zone vulnerability:  
http://www.nat.bg/~joro/scrspoof.html  
  
Cross-frame vulnerability:  
http://www.nat.bg/~joro/fr.html  
  
shows nothing unexpected.  
  
While the Bulletin states that the same MS Knowledgebase article,  
Q226326, applies to both MS99-011 and MS99-012, it was *not* available  
at the time of this writing (meaning it was there 10 minutes ago, but  
its not there now??). See;  
  
http://support.microsoft.com/support/kb/articles/q226/3/26.asp  
  
<rant>  
I just take this opportunity to say that I think Microsoft needs to make  
everyone aware of any installation process that requires a reboot to  
complete. There is no mention anywhere that fixing a browser component  
would require a system reboot, and while I can understand why its needed  
(having experience and all), no doubt lots of folks wouldn't expect it  
to be a requirement (although lots of folks likely believe that  
everything you do to an NT box requires a reboot!).  
  
The DHMTL fix doesn't require a reboot, but the MSHTML fix does. Given  
that both download pages recommend that you "Open" or "Run" the  
download, causing it to execute, one could easily find oneself in the  
position of being prompted for a reboot when you didn't expect one.  
  
Even the "detailed instructions" don't acknowledge that a reboot is  
required.  
  
A simple large, bold, message at the top of any download page indicating  
what will be expected if the download is "Open" or "Run" might at least  
acknowledge that too many reboots are expected by Microsoft.  
</rant>  
  
Cheers,  
Russ - NTBugtraq moderator  
  
---------------------------------------------------------------------------------  
  
Date: Thu, 22 Apr 1999 15:39:14 -0700  
From: Aleph One <[email protected]>  
To: [email protected]  
Subject: Re: Alert: Microsoft Security Bulletin (MS99-012) - MSHTML.dll  
  
On Thu, Apr 22, 1999 at 03:28:52AM -0400, Russ wrote:  
>  
> Cross-frame vulnerability:  
> http://www.nat.bg/~joro/fr.html  
  
I believe that is incorrect. That is an example of the other file stealing  
vulnerability in the DHTML Edit component. Yes, there where two  
of them in the same component. The cross-frame vulnerability test are:  
  
http://www.nat.bg/~joro/scrspoof.htmlasd  
http://www.nat.bg/~joro/scriptlet.html  
http://www.nat.bg/~joro/scrauto.html  
  
--  
Aleph One / [email protected]  
http://underground.org/  
KeyID 1024/948FD6B5  
Fingerprint EE C9 E8 AA CB AF 09 61 8C 39 EA 47 A8 6A B8 01  
  
`