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Microsoft Outlook VCard Unchecked Buffer Vulnerability



Microsoft Outlook VCard Unchecked Buffer Vulnerability Privacy and Legal Notice

CIAC INFORMATION BULLETIN

L-050: Microsoft Outlook VCard Unchecked Buffer Vulnerability

February 26, 2001 22:00 GMT

PROBLEM: An unchecked buffer in the Virtual business card application (VCard) could enable an attacker to run the code of his choice.
PLATFORM: Microsoft Outlook, Outlook Express
DAMAGE: Damage is limited to the account privileges of the e-mail recipient. Further, it cannot be exploited remotely. Like malicious code, the recipient must be persuaded to open/execute the VCard.
SOLUTION: Apply the Microsoft patches described below.

VULNERABILITY
ASSESSMENT:
MEDIUM. The potential damage of this exploit is limited to the account privileges of the recipient. In addition, it requires more than random characters to be inserted for the buffer overflow, and it requires the user of the system to execute it. This is not remotely exploitable.


[******  Start Microsoft Advisory ******]

- ----------------------------------------------------------------------
Title:      Outlook, Outlook Express Vcard Handler Contains
            Unchecked Buffer
Date:       22 February 2001
Software:   Outlook, Outlook Express
Impact:     Run code of attacker's choice
Bulletin:   MS01-012


Microsoft encourages customers to review the Security Bulletin at:
http://www.microsoft.com/technet/security/bulletin/MS01-012.asp.
- ----------------------------------------------------------------------


Issue:
======
Outlook Express provides several components that are used both by it
and Outlook, if Outlook is installed on the machine.  One such
component, used to process vCards, contains an unchecked buffer.


By creating a vCard and editing it to contain specially chosen data,
then sending it to another user, an attacker could cause  either of
two effects to occur if the recipient opened 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 her
choice on the user's  machine. Such code could take any desired
action, limited only by the permissions of the recipient on the
machine.


Because the component that contains the flaw ships as part of OE,
which itself ships as part of IE, the patch is specified in  terms of
the version of IE rather than OE or Outlook.


Mitigating Factors:
====================
 - There is no means by which a Vcard could be made to open
   automatically.



Patch Availability:
===================
 - A patch is available to fix this vulnerability. Please read the
   Security Bulletin
   http://www.microsoft.com/technet/security/bulletin/ms01-012.asp
   for information on obtaining this patch.


Acknowledgment:
===============
 - Ollie Whitehouse of @Stake (www.atstake.com)


- ---------------------------------------------------------------------


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.


[******  End Microsoft Advisory ******]



CIAC wishes to acknowledge the contributions of Microsoft for the information contained in this bulletin.
CIAC services are available to DOE, DOE Contractors, and the NIH. CIAC can be contacted at:
    Voice:          +1 925-422-8193 (7 x 24)
    FAX:            +1 925-423-8002
    STU-III:        +1 925-423-2604
    E-mail:          ciac@llnl.gov
    World Wide Web:  http://www.ciac.org/
                     http://ciac.llnl.gov
                     (same machine -- either one will work)
    Anonymous FTP:   ftp.ciac.org
                     ciac.llnl.gov
                     (same machine -- either one will work)

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 usefulness of any information, apparatus, product, or process disclosed, or represents that its use would not infringe privately owned rights. Reference herein to any specific commercial products, process, or service by trade name, trademark, manufacturer, or otherwise, does not necessarily constitute or imply its endorsement, recommendation or favoring by the United States Government or the University of California. The views and opinions of authors expressed herein do not necessarily state or reflect those of the United States Government or the University of California, and shall not be used for advertising or product endorsement purposes.
UCRL-MI-119788
[Privacy and Legal Notice]


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