Microsoft Outlook Express S/MIME certificate buffer overflow

outlook-smime-bo (10338) The risk level is classified as HighHigh Risk


Microsoft Outlook Express is vulnerable to a buffer overflow in the handling of S/MIME (Secure/Multipurpose Internet Mail Extensions) digitally signed messages. By sending a malicious email with a malformed S/MIME certificate to an Outlook Express client, a remote attacker could overflow a buffer and cause Outlook Express to crash or execute code on the system with the privileges of the Outlook Express user, once the message is opened or viewed in the preview pane.


Gain Access


Apply the appropriate patch for your system, as listed in the latest Microsoft Security Bulletin. See References.

— OR —

Use Microsoft Automatic Update if it is supported by your operating system. The original bulletin issued by Microsoft has been superseded.


Platforms Affected:

  • Microsoft Outlook Express 5.5
  • Microsoft Outlook Express 6.0


Oct 10, 2002

The information within this database may change without notice. Use of this information constitutes acceptance for use in an AS IS condition. There are NO warranties, implied or otherwise, with regard to this information or its use. Any use of this information is at the user's risk. In no event shall the author/distributor (IBM Internet Security Systems X-Force) be held liable for any damages whatsoever arising out of or in connection with the use or spread of this information.

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