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Microsoft Security Bulletin (MS00-043)
From: secnotif () MICROSOFT COM (Microsoft Product Security)
Date: Thu, 20 Jul 2000 18:38:04 -0700
The following is a Security Bulletin from the Microsoft Product Security Notification Service. Please do not reply to this message, as it was sent from an unattended mailbox. ******************************** -----BEGIN PGP SIGNED MESSAGE----- Microsoft Security Bulletin (MS00-043) - -------------------------------------- Patch Available for "Malformed E-mail Header" Vulnerability Originally posted: July 18, 2000 Updated: July 20, 2000 Summary ======= On July 18, 2000, Microsoft released the original version of this bulletin, to advise customers of the issue and recommend that they install either of the two service packs that will eliminate the vulnerability. On July 20, 2000, the bulletin was updated to announce the availability of patches that eliminate the vulnerability. Microsoft has released a patch that eliminates a security vulnerability in Microsoft(r) Outlook(r) and Outlook Express. Under certain conditions, the vulnerability could allow a malicious user to cause code of his choice to execute on another user's computer. The patch eliminates this vulnerability as well as those discussed in Microsoft Security Bulletins MS00-045 and MS00-046. Customers who already have taken the corrective action discussed in either of these bulletins do not need to take any additional action. Frequently asked questions regarding this vulnerability and the patch can be found at http://www.microsoft.com/technet/security/bulletin/fq00-043.asp Issue ===== A component shared by Outlook and Outlook Express, Inetcomm.dll, contains an unchecked buffer in the functionality that parses e-mail headers when downloading mail via either POP3 or IMAP4. By sending an e-mail that overruns the buffer, a malicious user could cause either of two effects to occur when the mail was downloaded from the server by an affected e-mail client: - If the affected field were filled with random data, the e-mail could be made to crash. - If the affected field were filled with carefully-crafted data, the e-mail client could be made to run code of the malicious user's choice. The vulnerability affects all Outlook Express users and all Outlook users whose mail clients are configured to use either POP3 or IMAP4. Outlook users who have configured Outlook to use only MAPI services are unlikely to be affected by the vulnerability. Despite this, Microsoft recommends that such customers apply one of the corrective steps discussed in the Patch Availability section, primarily because the patch protects against other vulnerabilities that affect all Outlook users, regardless of the mail protocol they use. A version of Inetcomm.dll that is not affected by the vulnerability ships as part of Outlook Express 5.5, and customers who have installed it do not need to take any additional action. Outlook Express 5.5 is available as part of Internet Explorer 5.01 Service Pack 1, and, except when installed on Windows 2000, Internet Explorer 5.5. Customers who do not wish to upgrade to Outlook Express 5.5 should install the patch provided below. Affected Software Versions ========================== - Microsoft Outlook Express 4.0 - Microsoft Outlook Express 4.01 - Microsoft Outlook Express 5.0 - Microsoft Outlook Express 5.01 - Microsoft Outlook 97 - Microsoft Outlook 98 - Microsoft Outlook 2000 Patch Availability ================== This vulnerability can be eliminated by taking any of the following actions: - Installing the patch available at http://www.microsoft.com/windows/ie/download/critical/patch9.htm - Performing a default installation of Internet Explorer 5.01 Service Pack 1, http://www.microsoft.com/Windows/ie/download/ie501sp1.htm. - Performing a default installation of Internet Explorer 5.5 (http://www.microsoft.com/windows/ie/download/ie55.htm) on any system except Windows 2000. Note: The patch requires IE 4.01 SP2 (http://www.microsoft.com/windows/ie/download/ie401sp2.htm) or IE 5.01 (http://www.microsoft.com/windows/ie/download/ie501.htm) to install. Customers who install this patch on versions other than these may receive a message reading "This update does not need to be installed on this system". This message is incorrect. More information is available in KB article Q267884 Note: In addition to eliminating the vulnerability at issue here, the steps above also eliminate all vulnerabilities discussed in Microsoft Security Bulletins MS00-045 (http://www.microsoft.com/technet/security/bulletin/MS00-045.asp) and MS00-046 (http://www.microsoft.com/technet/security/bulletin/MS00-046.asp). Customers who already have taken the corrective action discussed in either of these bulletins do not need to take any additional action. Note: Additional security patches are available at the Microsoft Download Center (http://www.microsoft.com/downloads). More Information ================ Please see the following references for more information related to this issue. - Frequently Asked Questions: Microsoft Security Bulletin MS00-043, http://www.microsoft.com/technet/security/bulletin/fq00-043.asp - Microsoft Knowledge Base article Q267884 discusses this issue and will be available soon. - Microsoft TechNet Security web site, http://www.microsoft.com/technet/security/default.asp Obtaining Support on this Issue =============================== This is a fully supported patch. Information on contacting Microsoft Technical Support is available at http://support.microsoft.com/support/contact/default.asp. Revisions ========= - July 18, 2000: Bulletin Created. - July 20, 2000: Bulletin updated to announce availability of a patch that does not require a full version upgrade of Internet Explorer. - ---------------------------------------------------------------- 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. Last Updated July 20,2000 (c) 2000 Microsoft Corporation. All rights reserved. Terms of use. -----BEGIN PGP SIGNATURE----- Version: PGP Personal Privacy 6.5.3 iQEVAwUBOXepXY0ZSRQxA/UrAQG7kgf+L6s0ckrCuem/AslKytL0WIniNyI5DpM3 nyk7NDeuQaev4Aq6789C/j5elHaM80ohrRtAp5+NPG4YY/SQLijwOfsiHJExo+Vd BtHa8E2/3rg5vX6zJCIE91RDoA5uNasPpDY8t9anIu3MjWJuFpnRlIJJ7xLkukp0 la5Cd/E7dbP3317yHnakm5ihZuZu4O5fiXpYxv61O1Uz6LELgEQ97fUToKNGBoL8 6Xo0gQ01VyY2DNMb5RD5YN0HNsQSpz1ShA8Uki877jUhGrdmYHKGgULyDAiL1PGt FTBXotQrGdgQ3fMTLydgV+8DlMAZmys09s+WN76gHnJsAimwXDQD7Q== =EgvT -----END PGP SIGNATURE----- ******************************************************************* You have received this e-mail bulletin as a result of your registration to the Microsoft Product Security Notification Service. 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Current thread:
- Microsoft Security Bulletin (MS00-043) Microsoft Product Security (Jul 20)
- Re: Microsoft Security Bulletin (MS00-043) Jeremy Epstein (Jul 21)
- Re: Microsoft Security Bulletin (MS00-043) Kurt Weiske (Jul 21)
- Re: Microsoft Security Bulletin (MS00-043) Jeremy Epstein (Jul 21)