Microsoft has released a cumulative patch for Microsoft
Outlook Express. This cumulative patch includes updates for the issues that are
described in the following Microsoft Knowledge Base article:
MS02-058: OLEXP: An unchecked
buffer in Outlook Express S/MIME parsing may permit system
The patch that this article describes applies to the
following versions of Microsoft Outlook Express:
- Microsoft Outlook Express 6.0 Service Pack 1, when it is used
with Internet Explorer 6.0 Service Pack 1 on Microsoft Windows 98 Second Edition, Microsoft Windows Millennium Edition, Microsoft Windows NT 4.0 Service Pack 6a, Microsoft Windows 2000 Service Pack 2, Microsoft Windows 2000 Service Pack 3, Microsoft Windows XP (32-bit versions only), and Microsoft Windows XP Service Pack 1 (32-bit or 64-bit versions).
- Microsoft Outlook Express 6.0, when it is used with Internet Explorer 6.0 on the operating
system Windows XP (32-bit versions only).
- Microsoft Outlook Express 5.5 Service Pack 2, when it is used
with Internet Explorer 5.5 Service Pack 2 on Windows 98 Second Edition, Windows Millennium Edition, Windows NT 4.0 Service Pack 6a, Windows 2000 Service Pack 2 and Windows 2000 Service Pack 3, or Internet Explorer 5.01 Service Pack 3 on Windows 2000 Service Pack 3.
The patch that this article describes helps to protect against
a vulnerability that exists
in the MHTML URL Handler where the MHTML URL Handler allows any file that can be rendered as text to
be opened and rendered as part of a page in Microsoft Internet Explorer. MHTML
stands for MIME Encapsulation of Aggregate HTML. MHTML is an Internet standard
that defines the MIME structure that is used to
send HTML content in e-mail message bodies. The MHTML URL Handler in Windows is
part of Outlook Express and provides a URL type that can be used on the local
computer. This URL type (MHTML://) allows MHTML documents to be opened from a
command line, from Internet Explorer, from the Run
dialog box on the Start
menu, or by using Windows Explorer.
Because of this vulnerability in the MHTML URL Handler, it would be possible to construct a Uniform Resource Locator (URL) that
referred to a text file that was stored on the local computer and have that
file render as HTML. If the text file contained script, that script would
run when the file was accessed. Because the file would reside on the local
computer, it would be rendered in the Local Computer Security Zone. Files that
are opened in the Local Computer Zone are subject to fewer restrictions than
files that are opened in other security zones.
By using this method, an attacker could try to construct a URL and either host it
on a Web site or send it by using an e-mail message. In the Web-based scenario,
where a user clicked a URL that is hosted on a Web site, an attacker could read or open files that are already present on the local computer.
In an e-mail message-based attack, if the user was using Outlook
Express 6.0 or Microsoft Outlook 2002 in its default configuration, or Microsoft
Outlook 98 or Microsoft Outlook 2000 with the Outlook E-mail
Security Update, an attack could not be automated, and the user would still have
to click the URL that was sent in the e-mail message. However, if the user was
not using Outlook Express 6.0 or Outlook 2002 in its default configuration,
or Outlook 98 or 2000 with the Outlook E-mail Security Update,
the attacker could cause an attack to trigger automatically without the user
having to click the URL in the e-mail message. In both the Web-based and e-mail message-based scenarios, any limitations on the user's privileges
would also restrict the capabilities of the attacker's
Applying the patch that is described in the following Microsoft
Knowledge Base article will help block an attacker from being able to load a
file onto a user's computer and prevent the passing of parameters to an
MS03-004: February, 2003, Cumulative Patch for Internet Explorer
This means that an attacker could only
start a program that already existed on the computer (if the attacker was
aware of the location of the program) and would not be able to pass parameters
to the program for it to run.
MHTML is a standard for exchanging HTML content in
e-mail, and, as a result, the MHTML URL Handler function has been implemented in
Outlook Express. Internet Explorer can also render MHTML content. However, the
MHTML function has not been implemented separately in Internet Explorer - it
uses Outlook Express to render the MHTML content.
For more information about this patch, visit the following
Microsoft Web site:
The following file is available for download from the Microsoft Download Center:
Download the 330994 package now.
Collapse this imageExpand this image
Release Date: April 23, 2003
For more information about how to download Microsoft Support files, click the following article number to view the article in the Microsoft Knowledge Base:
How to obtain Microsoft support files from online services
Microsoft scanned this file for viruses. Microsoft used the most current virus-detection software that was available on the date that the file was posted. The file is stored on security-enhanced servers that help prevent any unauthorized changes to the file.
Service Pack Information
To resolve this problem, obtain the latest service pack for Microsoft Windows 2000. For more information, click the following article number to view the article in the Microsoft Knowledge Base:
How to obtain the latest Windows 2000 service pack
You must be logged on as an administrator to install this patch.
To verify that the patch is installed on your computer, check the files in the
"File Information" section of this article.
Outlook Express 6.0 Service Pack 1
To install the Outlook Express 6.0 Service Pack 1 version of this
patch, you must be running Microsoft Outlook Express 6.0 Service Pack 1 on a
computer that is running Microsoft Windows XP Service Pack 1 (32-bit or 64-bit versions).
Outlook Express 6.0
To install the Outlook Express 6.0 version of this patch, you must be
running Outlook Express 6.0 on a 32-bit version of Windows XP.
Outlook Express 5.5 Service Pack 2
To install the
Microsoft Outlook Express 5.5 Service Pack 2 version of this patch, you must
be running Microsoft Outlook Express 5.5 Service Pack 2 on a computer that is running
Microsoft Windows 2000 Service Pack 3.
For more information, click the following article numbers to view the articles in the Microsoft Knowledge Base:
How to obtain the latest service pack for Internet Explorer
obtain the latest Windows XP service pack
obtain the latest Windows 2000 service pack
When you install the patches that are described in this article, you
do not have to reboot your computer when the following conditions are
- You shut down Outlook Express before you install the
- The About Internet Explorer dialog box is not open when
you install the patch.
Previous Update Status
This patch supersedes the Microsoft Security Bulletin MS02-058 for Outlook Express and the Cumulative Update for Outlook Express 6.0 SP1.
The update packages for this patch support the following switches:
- /q - Specifies quiet mode (in other words, suppresses prompts) when
files are extracted.
- /q:u - Specifies user-quiet mode, which displays some dialog boxes to
- /q:a - Specifies administrator-quiet mode, which does not display any
dialog boxes to the user.
path - Specifies the target folder for extracting files.
- /c - Extracts the files without installing them.
path - Specifies the path and the name of the Setup .inf or .exe file.
- /r:n - Never restarts the computer after an installation.
- /r:i - Restarts the computer if a restart is required. Automatically
restarts the computer if a restart is required to complete installation.
- /r:a - Always restarts the computer after an installation.
- /r:s - Restarts the computer after an installation without prompting
- /n:v - No version checking. Installs the program over any previous
For example, use the following command line to install the
patch without any user intervention and without forcing the computer to
q330994 /q:a /r:n
The English version of this update has the file attributes (or later file attributes) that are listed in the following table. The dates and times for these files are listed in Coordinated Universal Time (UTC). When you view the file information, it is converted to local time. To find the difference between UTC and local time, use the Time Zone
tab in the Date and Time tool in Control Panel.
Internet Explorer 6 SP1 (32-bit)
Date Time Version Size File name
03-Mar-2003 04:24 6.0.2800.1123 75,776 Directdb.dll
03-Mar-2003 04:41 6.0.2800.1165 592,384 Inetcomm.dll
09-Mar-2003 12:42 6.0.2800.1123 47,616 Inetres.dll
03-Mar-2003 09:24 6.0.2800.1123 44,032 Msident.dll
03-Mar-2003 03:57 6.0.2800.1123 56,832 Msimn.exe
11-Oct-2002 02:08 6.0.2800.1158 1,174,528 Msoe.dll
03-Mar-2003 03:57 6.0.2800.1123 228,864 Msoeacct.dll
03-Mar-2003 03:57 6.0.2800.1123 2,479,616 Msoeres.dll
03-Mar-2003 03:57 6.0.2800.1123 91,136 Msoert2.dll
03-Mar-2003 03:57 6.0.2800.1123 93,184 Oeimport.dll
03-Mar-2003 03:57 6.0.2800.1123 55,808 Oemig50.exe
03-Mar-2003 03:57 6.0.2800.1123 31,744 Oemiglib.dll
03-Mar-2003 03:57 6.0.2800.1123 42,496 Wab.exe
03-Mar-2003 03:57 6.0.2800.1123 462,848 Wab32.dll
03-Mar-2003 03:57 6.0.2800.1123 30,208 Wabfind.dll
03-Mar-2003 03:57 6.0.2800.1123 77,824 Wabimp.dll
03-Mar-2003 03:57 6.0.2800.1123 27,648 Wabmig.exe
Internet Explorer 6 SP1 (64-bit)
Date Time Version Size File name
05-Nov-2002 09:53 6.0.2800.1123 251,904 Directdb.dll
19-Feb-2003 03:19 6.0.2800.1165 2,197,504 Inetcomm.dll
05-Nov-2002 09:53 6.0.2800.1123 47,104 Inetres.dll
05-Nov-2002 09:53 6.0.2800.1123 63,488 Msimn.exe
19-Feb-2003 03:37 6.0.2800.1158 4,482,560 Msoe.dll
05-Nov-2002 09:53 6.0.2800.1123 729,088 Msoeacct.dll
05-Nov-2002 09:54 6.0.2800.1123 2,479,104 Msoeres.dll
05-Nov-2002 09:53 6.0.2800.1123 300,032 Msoert2.dll
05-Nov-2002 09:53 6.0.2800.1123 302,080 Oeimport.dll
05-Nov-2002 09:54 6.0.2800.1123 142,336 Oemig50.exe
05-Nov-2002 09:54 6.0.2800.1123 73,728 Oemiglib.dll
05-Nov-2002 09:53 6.0.2800.1123 87,040 Wab.exe
05-Nov-2002 09:53 6.0.2800.1123 1,773,568 Wab32.dll
05-Nov-2002 09:53 6.0.2800.1123 38,912 Wabfind.dll
05-Nov-2002 09:53 6.0.2800.1123 240,640 Wabimp.dll
05-Nov-2002 09:53 6.0.2800.1123 71,680 Wabmig.exe
Internet Explorer 6
Date Time Version Size File name
17-Mar-2003 11:44 6.0.2727.1300 594,944 Inetcomm.dll
17-Mar-2003 11:44 6.0.2720.3000 1,175,040 Msoe.dll
Internet Explorer 5.5 SP2
Date Time Version Size File name
30-Jan-2003 04:26 5.50.4925.2800 572,176 Inetcomm.dll
15-Oct-2002 07:15 5.50.4922.1500 1,146,640 Msoe.dll
This patch does not contain file dependencies.
To remove this patch, use the Add or Remove Programs (Add/Remove
Programs) tool in Control Panel. Click Outlook Express Update Q330994
, and then click Change/Remove