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Category:   Application (E-mail Server)  >   Microsoft Exchange Vendors:   Microsoft
(Microsoft Revises the Patch) Re: Microsoft Exchange Server's Outlook Web Access (OWA) Lets Remote Users Execute Arbitrary Code on the OWA User's Web Browser
SecurityTracker Alert ID:  1001745
SecurityTracker URL:  http://securitytracker.com/id/1001745
CVE Reference:   CVE-2001-0340   (Links to External Site)
Date:  Jun 13 2001
Impact:   Execution of arbitrary code via network, Modification of user information
Fix Available:  Yes  Vendor Confirmed:  Yes  
Version(s): Microsoft Exchange 2000 Server Outlook Web Access, Exchange 5.5
Description:   Microsoft reported a vulnerability in the Outlook Web Access (OWA) service of Microsoft Exchange Server that may let remote users execute arbitrary code on the OWA user's web browser. The arbitrary code could manipulate the user's e-mail.

A remote user can send an e-mail message containing a malicious attachment to the target OWA user. If the attachment contains HTML content and includes a script, the script will be executed automatically and without warning when the OWA user double clicks on the attachment (using OWA).

It is reported that the interaction between Internet Explorer and OWA contains a flaw that does not display the normal user verification dialogue box when an attachment is opened. Instead, the attachment will be automatically opened and, because the file is opened using IE, the browser will parse any script contained in the file.

Impact:   A remote user could cause arbitrary code to be executed by the OWA user's web browser. This arbitrary code would be capable of taking any action that the user could take on the mailbox, including adding, editing, or deleting data in the mailbox.
Solution:   The vendor has issued a revised patch. See the Vendor URL to obtain the patch.
Vendor URL:  www.microsoft.com/technet/security/bulletin/ms01-030.asp (Links to External Site)
Cause:   State error
Underlying OS:  Windows (NT), Windows (2000)

Message History:   This archive entry is a follow-up to the message listed below.
Jun 7 2001 Microsoft Exchange Server's Outlook Web Access (OWA) Lets Remote Users Execute Arbitrary Code on the OWA User's Web Browser



 Source Message Contents

Subject:  Microsoft Security Bulletin MS01-030 (version 3.0)


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.
                    ********************************

-----BEGIN PGP SIGNED MESSAGE-----

- ----------------------------------------------------------------------
Title:      Incorrect Attachment Handling in Exchange OWA Can 
            Execute Script
Date:       06 June 2001
Revised:    13 June 2001 (version 3.0)
Software:   Exchange 5.5, Exchange 2000
Impact:     Run code of attacker's choice on mail client
Bulletin:   MS01-030

Microsoft encourages customers to review the Security Bulletin at:
http://www.microsoft.com/technet/security/bulletin/MS01-030.asp.
- ----------------------------------------------------------------------

Reason for Revision:
====================
On June 12, 2001 Microsoft discovered that the updated Exchange 2000 
patch contained outdated files. We have corrected the error and 
provided an updated version of this patch for Exchange 2000. We 
recommend that all customers who have downloaded the Exchange 2000 
patch prior to June 12, 2001 install the updated version. 

Issue:
======
OWA is a service of Exchange Server that allows users to use a web 
browser to access their Exchange mailbox. However, a flaw exists in
the 
interaction between OWA and IE for message attachments. If an 
attachment contains HTML code including script, the script will be 
executed when the attachment is opened, regardless of the attachment 
type. Because OWA requires that scripting be enabled in the zone
where 
the OWA server is located, this script could take action against the 
user's Exchange mailbox. 

An attacker could use this flaw to construct an attachment containing
malicious script code. The attacker could then send the attachment in
a 
message to the user. If the user opened the attachment in OWA, the 
script would execute and could take action against the user's mailbox
as if it were the user, including, under certain circumstances, 
manipulation of messages or folders.

Mitigating Factors:
====================
- - The vulnerability could only be exploited if the user were 
   using OWA in conjunction with IE. 
 - The vulnerability is only exploitable by attachments that 
   are received via OWA. In general, an attacker would have no 
   way to determine whether a user would open an attachment 
   using OWA rather than an Outlook client. 
 - An attacker's ability to exploit this vulnerability would 
   require that she entice the user to open an attachment from 
   an untrusted source. Best practices recommend against opening 
   any attachment from an unknown or untrusted source.

Patch Availability:
===================
- - A patch is available to fix this vulnerability. Please read the 
   Security Bulletin
   http://www.microsoft.com/technet/security/bulletin/ms01-030.asp
   for information on obtaining this patch.

Acknowledgment:
===============
- - Joao Gouveia (tharbad@kaotik.org)
- ---------------------------------------------------------------------

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