Zhen-Xjell
February 21st, 2002, 11:30 PM
-----BEGIN PGP SIGNED MESSAGE-----
- -
- ----------------------------------------------------------------------
Title: * * *Incorrect VBScript Handling in IE can Allow Web Pages to
* * * * * *Read Local Files
Date: * * * 21 February 2002
Software: * Internet Explorer
Impact: * * Information Disclosure
Max Risk: * Critical
Bulletin: * MS02-009
Microsoft encourages customers to review the Security Bulletin at:
http://www.microsoft.com/technet/security/bulletin/MS02-009.asp.
- -
- ----------------------------------------------------------------------
Issue:
======
Frames are used in Internet Explorer to provide for a fuller
browsing experience. By design, scripts in the frame of one site or
domain should be prohibited from accessing the content of frames
in another site or domain. However, a flaw exists in how VBScript
is handled in IE relating to validating cross-domain access. This
flaw can allow scripts of one domain to access the contents of
another domain in a frame.
A malicious user could exploit this vulnerability by using
scripting to extract the contents of frames in other domains,
then sending that content back to their web site. This would
enable the attacker to view files on the user's local machine
or capture the contents of third-party web sites the user visited
after leaving the attacker's site. The latter scenario could,
in the worst case, enable the attacker to learn personal
information like user names, passwords, or credit card information.
In both cases, the user would either have to go to a site under
the attacker's control or view an HTML email sent by the attacker.
In addition, the attacker would have to know the exact name and
location of any files on the user's system. Further, the attacker
could only gain access to files that can be displayed in a browser
window, such as text files, HTML files, or image files.
Mitigating Factors:
====================
- The vulnerability could only be used to view files. It could not
* be used to create, delete, modify or execute them.
- The vulnerability would only allow an attacker to read files that
* can be opened in a browser window, such as image files, HTML
* files and text files. Other file types, such as binary files,
* executable files, Word documents, and so forth, could not be read.
- The attacker would need to specify the exact name and location of
* the file in order to read it.
- The email-borne attack scenario would be blocked if the user were
* using any of the following: Outlook 98 or 2000 with the Outlook
* Email Security Update installed; Outlook 2002; or Outlook
* Express 6.
Risk Rating:
============
- Internet systems: Moderate
- Intranet systems: Moderate
- Client systems: Critical
Patch Availability:
===================
- A patch is available to fix this vulnerability. Please read the
* Security Bulletin at
* http://www.microsoft.com/technet/security/bulletin/ms02-009.asp
* for information on obtaining this patch.
Acknowledgment:
===============
- Zentai Peter Aron, Ivy Hungary Ltd (http://w3.ivy.hu/)
- -
- ---------------------------------------------------------------------
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.
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*******************************************************************
You have received this e-mail bulletin as a result of your subscription to the Microsoft Product Security Notification * Service. *For more information on this service, please visit http://www.microsoft.com/technet/security/notify.asp.
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For security-related information about Microsoft products, please *visit the Microsoft Security Advisor web site at http://www.microsoft.com/security.
- -
- ----------------------------------------------------------------------
Title: * * *Incorrect VBScript Handling in IE can Allow Web Pages to
* * * * * *Read Local Files
Date: * * * 21 February 2002
Software: * Internet Explorer
Impact: * * Information Disclosure
Max Risk: * Critical
Bulletin: * MS02-009
Microsoft encourages customers to review the Security Bulletin at:
http://www.microsoft.com/technet/security/bulletin/MS02-009.asp.
- -
- ----------------------------------------------------------------------
Issue:
======
Frames are used in Internet Explorer to provide for a fuller
browsing experience. By design, scripts in the frame of one site or
domain should be prohibited from accessing the content of frames
in another site or domain. However, a flaw exists in how VBScript
is handled in IE relating to validating cross-domain access. This
flaw can allow scripts of one domain to access the contents of
another domain in a frame.
A malicious user could exploit this vulnerability by using
scripting to extract the contents of frames in other domains,
then sending that content back to their web site. This would
enable the attacker to view files on the user's local machine
or capture the contents of third-party web sites the user visited
after leaving the attacker's site. The latter scenario could,
in the worst case, enable the attacker to learn personal
information like user names, passwords, or credit card information.
In both cases, the user would either have to go to a site under
the attacker's control or view an HTML email sent by the attacker.
In addition, the attacker would have to know the exact name and
location of any files on the user's system. Further, the attacker
could only gain access to files that can be displayed in a browser
window, such as text files, HTML files, or image files.
Mitigating Factors:
====================
- The vulnerability could only be used to view files. It could not
* be used to create, delete, modify or execute them.
- The vulnerability would only allow an attacker to read files that
* can be opened in a browser window, such as image files, HTML
* files and text files. Other file types, such as binary files,
* executable files, Word documents, and so forth, could not be read.
- The attacker would need to specify the exact name and location of
* the file in order to read it.
- The email-borne attack scenario would be blocked if the user were
* using any of the following: Outlook 98 or 2000 with the Outlook
* Email Security Update installed; Outlook 2002; or Outlook
* Express 6.
Risk Rating:
============
- Internet systems: Moderate
- Intranet systems: Moderate
- Client systems: Critical
Patch Availability:
===================
- A patch is available to fix this vulnerability. Please read the
* Security Bulletin at
* http://www.microsoft.com/technet/security/bulletin/ms02-009.asp
* for information on obtaining this patch.
Acknowledgment:
===============
- Zentai Peter Aron, Ivy Hungary Ltd (http://w3.ivy.hu/)
- -
- ---------------------------------------------------------------------
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.
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*******************************************************************
You have received this e-mail bulletin as a result of your subscription to the Microsoft Product Security Notification * Service. *For more information on this service, please visit http://www.microsoft.com/technet/security/notify.asp.
To verify the digital signature on this bulletin, please download our PGP key at http://www.microsoft.com/technet/security/notify.asp.
To cancel your subscription, click on the following link mailto:1_26139_1E81A08D-A2CD-4E10-8D7F-16D1039270F8_US@Newsletters.Microsoft.com?subject=UNSUBSCRIBE to create an unsubscribe e-mail.
To stop all e-mail newsletters from microsoft.com, click on the following link mailto:2_26139_1E81A08D-A2CD-4E10-8D7F-16D1039270F8_US@Newsletters.Microsoft.com?subject=STOPMAIL to create an unsubscribe e-mail. *You can manage all your Microsoft.com communication preferences from http://www.microsoft.com/misc/unsubscribe.htm
For security-related information about Microsoft products, please *visit the Microsoft Security Advisor web site at http://www.microsoft.com/security.