To support the exchange of mail with heterogeneous systems, Exchange messages use the attributes of SMTP mail messages that are specified by RFC's 821 and 822. There is a flaw in the way Exchange 2000 handles certain malformed RFC message attributes on received mail. Upon receiving a message containing such a malformation, the flaw causes the Store service to consume 100% of the available CPU in processing the message.
A security vulnerability results because it is possible for an attacker to seek to exploit this flaw and mount a denial of service attack. An attacker could attempt to levy an attack by connecting directly to the Exchange server and passing a raw, hand-crafted mail message with a specially malformed attribute. When the message was received and processed by the Store service, the CPU would spike to 100%. The effects of the attack would last as long as it took for the Exchange Store service to process the message. Neither restarting the service nor rebooting the server would remedy the denial of service.
Microsoft Office SharePoint Designer 2007 SP2 Microsoft Office SharePoint Designer 2007 SP2 provides customers with the latest updates to Office SharePoint Designer 2007. This download includes two types of fixes, previously unreleased fixes that were made specifically for this service pack.Requiremen
Microsoft Exchange Troubleshooting Assistant v1.1 The Microsoft Exchange Troubleshooting Assistant can help to determine the cause of performance, mail flow and database mounting issues on computers running Microsoft Exchange Server. The tool automates specialized troubleshooting steps for identified symp
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Checkbook Example for Visio 2000 This example, a simple checkbook and ledger application, is designed to acquaint you with some of Visio's capabilities in the creation and use of forms-based processing. The majority of the functionality is available under both Visio 5.0 and Visio 2000. Th
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Supported Operating Systems:
Windows 2000 |
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