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Title: E-mail Header Processing Flaw Could Cause Outlook 2002 to Fail (331866) Date: 04 December 2002 Software: Microsoft Outlook 2002 Impact: Denial of Service Max Risk: Moderate Bulletin: MS02-067
Microsoft encourages customers to review the Security Bulletins at: http://www.microsoft.com/technet/security/bulletin/MS02-067.asp http://www.microsoft.com/security/security_bulletins/MS02-067.asp
Microsoft Outlook provides users with the ability to work with e-mail, contacts, tasks, and appointments. Outlook e-mail handling includes receiving, displaying, creating, editing, sending, and organizing e-mail messages. When working with received e-mail messages, Outlook processes information contained in the header of the e-mail which carries information about where the e-mail came from, its destination, and attributes of the message.
A vulnerability exists in Outlook 2002 in its processing of e-mail header information. An attacker who successfully exploited the vulnerability could send a specially malformed e-mail to a user of Outlook 2002 that would cause the Outlook client to fail under certain circumstances. The Outlook 2002 client would continue to fail so long as the specially malformed e-mail message remained on the e-mail server. The e-mail message could be deleted by an e-mail administrator, or by the user via another e-mail client such as Outlook Web Access or Outlook Express, after which point the Outlook 2002 client would again function normally.
Outlook 2002 clients connecting to e-mail servers using the MAPI protocol are not affected. Only Outlook 2002 clients using POP3, IMAP, or WebDAV protocols are vulnerable.
The vulnerability does not affect Outlook 2000 or Outlook Express.
The vulnerability is a denial of service vulnerability only. The attacker would not be able to access the user?s e-mail or system in any way. The vulnerability could not be used to read, delete, create, or alter the user?s e-mail.
If an attacker was able to send a specially malformed e-mail that successfully exploited this vulnerability, the specially malformed e-mail could be deleted either by an e-mail administrator, or by the user via another e-mail client such as Outlook Web Access or Outlook Express. Once the specially malformed e-mail has been removed, normal operation would resume.
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