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TUCoPS :: Windows Net Apps :: n-007.txt

Microsoft Outlook Express Unchecked Buffer in S-MIME Vulnerability (CIAC N-007)




             __________________________________________________________

                       The U.S. Department of Energy
                   Computer Incident Advisory Capability
                           ___  __ __    _     ___
                          /       |     /_\   /
                          \___  __|__  /   \  \___
             __________________________________________________________

                             INFORMATION BULLETIN

       Microsoft Outlook Express Unchecked Buffer in S/MIME Vulnerability
                     [Microsoft Security Bulletin MS02-058]

October 11, 2002 14:00 GMT                                        Number N-007
______________________________________________________________________________
PROBLEM:       To allow for verification of the authenticity of mail messages,
               Microsoft Outlook Express supports digital signing of messages
               through S/MIME. A buffer overrun vulnerability lies in the code
               that generates the warning message when a particular error
               condition associated with digital signatures occurs.
AFFECTED       Microsoft Outlook Express 6.0 
SOFTWARE:      Microsoft Outlook Express 5.5
DAMAGE:        By sending a specially crafted e-mail that contains a malformed
               S/MIME certificate: 
               (1) an attacker could cause the mail client to run code of 
               his/her choice limited only by the e-mail recipient's 
               permissions on the machine. 
               (2) an attacker could cause the mail client to fail by 
               overrunning the buffer with random data.
SOLUTION:      Apply available patch.
______________________________________________________________________________
VULNERABILITY  The risk is MEDIUM. The vulnerability only affects Microsoft 
ASSESSMENT:    Outlook Express, not Microsoft Outlook. An attacker could run 
               code of his/her choice which includes reformatting the hard
               drive. Simply opening the e-mail, or viewing it through Preview
               Mode, could allow the attacker to exploit the vulnerability.
______________________________________________________________________________
LINKS:
 CIAC BULLETIN:      http://www.ciac.org/ciac/bulletins/n-007.shtml
 ORIGINAL BULLETIN:  http://www.microsoft.com/technet/treeview/default.asp?url=
                          /technet/security/bulletin/MS02-058.asp
 PATCHES:            http://www.microsoft.com/windows/ie/downloads/critical/
                          q328676/default.asp
______________________________________________________________________________
[***** Start Microsoft Security Bulletin MS02-058 *****]

Microsoft Security Bulletin MS02-058  

Unchecked Buffer in Outlook Express S/MIME Parsing Could Enable System 
Compromise (Q328676)

Originally posted: October 10, 2002

Summary
Who should read this bulletin: Customers using Microsoft® Outlook Express 

Impact of vulnerability: Run code of attackers choice. 

Maximum Severity Rating: Critical 

Recommendation: Customers using Outlook Express should apply the patch 

Affected Software: 

Microsoft Outlook Express 6.0 
Microsoft Outlook Express 5.5 
Note: Microsoft Outlook is a different product than Microsoft Outlook Express, 
and is not affected by the vulnerability.

 Technical details
Technical description: 


To allow for verification of the authenticity of mail messages, Microsoft 
Outlook Express supports digital signing of messages through S/MIME. A 
buffer overrun vulnerability lies in the code that generates the warning 
message when a particular error condition associated with digital 
signatures occurs. 

By creating a digitally signed email and editing it to introduce specific 
data, then sending it to another user, an attacker could cause either of 
two effects to occur if the recipient opened or previewed it. In the less 
serious case, the attacker could cause the mail client to fail. If this 
happened, the recipient could resume normal operation by restarting the 
mail client and deleting the offending mail. In the more serious case, 
the attacker could cause the mail client to run code of their choice on 
the user’s machine. Such code could take any desired action, limited only 
by the permissions of the recipient on the machine. 

This vulnerability could only affect messages that are signed using S/MIME 
and sent to an Outlook Express user. Users of Microsoft Outlook products 
are not affected by this vulnerability. 

Mitigating factors: 

Microsoft Outlook is not affected by this vulnerability. 
Outlook Express runs in the context of the user. Exploiting this vulnerability 
would in the worst case scenario allow an attacker to run arbitrary code in 
the context of the users’ privileges only. Any restrictions on the users’ 
account would apply to the attackers code. 

Severity Rating:        Internet Servers Intranet Servers Client Systems 
Outlook Express 6.0             Low             Low           Critical 
Outlook Express 5.5             Low             Low           Critical 
The above assessment is based on the types of systems affected by the 
vulnerability, their typical deployment patterns, and the effect that 
exploiting the vulnerability would have on them. 

Vulnerability identifier: CAN-2002-1179 

Tested Versions:
Microsoft tested Outlook Express 5.5 and 6.0 to assess whether they are 
affected by these vulnerabilities. Previous versions are no longer supported, 
and may or may not be affected by these vulnerabilities.

Patch availability
Download locations for this patch 
Microsoft Outlook Express: 
http://www.microsoft.com/windows/ie/downloads/critical/q328676/default.asp 

 Additional information about this patch
Installation platforms: 

The patch for Outlook Express 6.0 can be applied to systems running 
Outlook Express 6.0 Gold.
 
The patch for Outlook Express 5.5 can be applied to systems running 
Outlook Express 5.5 Service Pack 2. 

Inclusion in future service packs:

The fix for this issue is included in Outlook Express 6.0 Service Pack 1 
(which is available in Internet Explorer 6.0 Service Pack 1 or as part of 
Windows XP Service Pack 1). 

The fix for this issue will be included in any future service packs for 
Outlook Express 5.5. 

Reboot needed: No 

Patch can be uninstalled: No 

Superseded patches: None. 

Verifying patch installation:

Outlook Express 6.0 

To verify that the patch has been installed on the machine, open Internet 
Explorer, select Help, then select About Internet Explorer and confirm that 
Q328676 is listed in the Update Versions field. Alternatively, from Outlook 
Express select Help, then select About Outlook Express and confirm that the 
msoe.dll matches the version called out in Q328676. 

To verify the individual files, use the patch manifest provided in Knowledge 
Base article Q328676.
 
Outlook Express 5.5 Service Pack 2 

To verify that the patch has been installed on the machine, open IE, select 
Help, then select About Internet Explorer and confirm that Q328389 is listed 
in the Update Versions field. Alternatively, from Outlook Express select Help, 
then select About Outlook Express and confirm that the msoe.dll matches the 
version called out in Q328389. 

To verify the individual files, use the patch manifest provided in Knowledge 
Base article Q328389.
 
Caveats:
Under a very unusual set of conditions, it could be possible to inadvertently 
remove the patch. Specifically, if the patch is installed on a system, and the 
user subsequently installs and uninstalls Windows XP Service Pack 1, the effect 
will be to remove not only Service Pack 1, but the patch as well. Similarly, 
installing and the uninstalling Internet Explorer 6.0 Service Pack 1 will 
remove the patch, if it’s previously been installed. In either scenario, the 
patch should be separately re-applied after uninstalling the service pack. 

Localization:
Localized versions of this patch are available at the locations discussed in 
“Patch Availability”. 

Obtaining other security patches: 
Patches for other security issues are available from the following locations: 

Security patches are available from the Microsoft Download Center, and can be 
most easily found by doing a keyword search for "security_patch". 

Patches for consumer platforms are available from the WindowsUpdate web site.
 
Other information: 

Acknowledgments
Microsoft thanks  Noam Rathaus of Beyond Security Ltd. 
(http://www.beyondsecurity.com) for reporting this issue 
to us and working with us to protect customers.

Support: 

Microsoft Knowledge Base article Q328676 discusses this issue and will be 
available approximately 24 hours after the release of this bulletin. Knowledge 
Base articles can be found on the Microsoft Online Support web site. 

Technical support is available from Microsoft Product Support Services. There 
is no charge for support calls associated with security patches. 

Security Resources: The Microsoft TechNet Security Web Site provides additional 
information about security in Microsoft products. 

Disclaimer: 
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. 

Revisions: 
V1.0 (October 10, 2002): Bulletin Created. 

[***** End Microsoft Security Bulletin MS02-058 *****]
_______________________________________________________________________________

CIAC wishes to acknowledge the contributions of Microsoft Corporation for the
information contained in this bulletin.
_______________________________________________________________________________

CIAC, the Computer Incident Advisory Capability, is the computer
security incident response team for the U.S. Department of Energy
(DOE) and the emergency backup response team for the National
Institutes of Health (NIH). CIAC is located at the Lawrence Livermore
National Laboratory in Livermore, California. CIAC is also a founding
member of FIRST, the Forum of Incident Response and Security Teams, a
global organization established to foster cooperation and coordination
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CIAC services are available to DOE, DOE contractors, and the NIH. CIAC
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Previous CIAC notices, anti-virus software, and other information are
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   World Wide Web:      http://www.ciac.org/
   Anonymous FTP:       ftp.ciac.org

PLEASE NOTE: Many users outside of the DOE, ESnet, and NIH computing
communities receive CIAC bulletins.  If you are not part of these
communities, please contact your agency's response team to report
incidents. Your agency's team will coordinate with CIAC. The Forum of
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This document was prepared as an account of work sponsored by an
agency of the United States Government. Neither the United States
Government nor the University of California nor any of their
employees, makes any warranty, express or implied, or assumes any
legal liability or responsibility for the accuracy, completeness, or
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