Security Update, March 29, 2001

Published: March 29, 2001

Read This First

This update resolves a security vulnerability in Internet Explorer, and is discussed in Microsoft Security Bulletin MS01-020. Download now to help prevent a malicious user from running an executable e-mail attachment on your computer.

This vulnerability exists because Internet Explorer does not handle MIME (Multipurpose Internet Mail Extensions) headers in HTML e-mails correctly. If a malicious user sends an affected HTML e-mail or hosts an affected e-mail on a Web site, and a user opens the e-mail or visits the Web site, Internet Explorer automatically runs the excecutable on the user's computer. If this occurs, the executable can take any action on the computer that the user can take, including adding, changing, or deleting data, communicating with Web sites, or reformatting the hard drive. This update eliminates the vulnerability by correcting the way Internet Explorer handles MIME headers in HTML e-mails, preventing e-mails from automatically launching executable attachments.

For more information about this vulnerability, read Microsoft Security Bulletin MS01-020.

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System Requirements

•	Internet Explorer 5.01 Service Pack 1
•	Internet Explorer 5.5 Service Pack 1

Note: This update is included in Internet Explorer 5.01 Service Pack 2.

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How to download and install

Select your language and browser version from the table below.

Language	Internet Explorer 5.5 SP1	Internet Explorer 5.01 SP1
English	Security Update 523 KB file	Security Update 499 KB file
Arabic	Security Update 523 KB file	Security Update 499 KB file
Chinese (Simplified)	Security Update 523 KB file	Security Update 499 KB file
Chinese (Traditional)	Security Update 523 KB file	Security Update 499 KB file
Czech	Security Update 523 KB file	Security Update 499 KB file
Danish	Security Update 523 KB file	Security Update 499 KB file
Dutch	Security Update 523 KB file	Security Update 499 KB file
Finnish	Security Update 523 KB file	Security Update 499 KB file
French	Security Update 523 KB file	Security Update 499 KB file
German	Security Update 523 KB file	Security Update 499 KB file
Greek	Security Update 523 KB file	Security Update 499 KB file
Hebrew	Security Update 523 KB file	Security Update 499 KB file
Hungarian	Security Update 523 KB file	Security Update 499 KB file
Italian	Security Update 523 KB file	Security Update 499 KB file
Japanese	Security Update 523 KB file	Security Update 499 KB file
Korean	Security Update 523 KB file	Security Update 499 KB file
Norwegian	Security Update 523 KB file	Security Update 499 KB file
Polish	Security Update 523 KB file	Security Update 499 KB file
Portugese (Brazilian)	Security Update 523 KB file	Security Update 499 KB file
Portugese	Security Update 523 KB file	Security Update 499 KB file
Russian	Security Update 523 KB file	Security Update 499 KB file
Slovak	Security Update 523 KB file	Security Update 499 KB file
Slovenian	Security Update 523 KB file	Security Update 499 KB file
Spanish	Security Update 523 KB file	Security Update 499 KB file
Swedish	Security Update 523 KB file	Security Update 499 KB file
Turkish	Security Update 523 KB file	Security Update 499 KB file

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How to use

Restart your computer to complete the installation.

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How to uninstall

Uninstall is not available.

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