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Missatges |
Vulnerabilitat en Outlook |
| Lluís Canela [lcanela@pie.xtec.es] dijous 20/07/00 3:28 |
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Per la seva importància (pels usuaris
de Outlook i Outlook Express) passo aquest missatge que he rebut
sobre un nou "bug" descobert fa un mes per una companyia
sud-americana USSR LABS que descriu el bug com a nefast. No s'havia publicat abans per donar
temps a Microsoft a trobar-hi la solució. No és necessari obrir l'e-mail o obrir
un arxiu adjunt. Des del moment en que comença a baixar l'e-mail al disc
dur s'infecta l'ordinador.
El missatge que segueix a continuació
és una traducció de la solució proposada per Microsoft i
l'original.
Lluís.
A continuación viene el texto completo del Boletín de seguridad de Microsoft acerca del importante fallo de seguridad que afecta a los usuarios de Outlook y Outlook Express. Hago el breve resumen (no es una traducción literal) para los que no entienden inglés: El asunto es *realmente* grave, la vulnerabilidad
descubierta puede permitir al maleante hacer cualquier cosa con el ordenador de
la víctima, incluyendo el formato del disco.
Los productos
afectados:
- 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 Los que no están en
peligro:
Atención de los usuarios de Windows
2000:
Si solo instalaron el IE 5.5 para Windows 2000,
Outlook Express no fue actualizado a la versión 5.5. Para corregir esta
situación, es necesario, desinstalar el IE 5.5 e instalar IE 5.01 SP 1,
instalación estándar. (Para que actualice también Outlook Express). Después de
esto se puede volver a instalar el IE 5.5.
Atención de los usuarios de
Outlook:
La actualización al OE 5.5 elimina también la vulnerabilidad de Outlook, ya
que ambos programas utilizan la inetcomm.dll para el manejo de los
protocolos del correo de Internet y esta dll se actualiza con el Outlook
Express 5.5. Para los usuarios que no deseen actualizar Outlook
Express Microsoft sacará en breve un parche que eliminará esta vulnerabilidad de
sus ordenadores sin necesidad de actualizar el OE.
----------------------------------------------------------
---------------------------
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 Summary ======= 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. 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 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. Customers who have installed Internet Explorer 5.01 Service Pack 1, and customers who have installed Internet Explorer 5.5 on any system other than Windows 2000, would not be affected by this vulnerability. Likewise, Outlook users who have configured Outlook to use only MAPI services would not be affected, regardless of what version of Internet Explorer they have installed. 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 ================== The vulnerability can be eliminated by a default installation of either of the following upgrades: - Internet Explorer 5.01 Service Pack 1, http://www.microsoft.com/Windows/ie/download/ie501sp1.htm - Internet Explorer 5.5 on any system except Windows 2000, http://www.microsoft.com/windows/ie/download/ie55.htm Note: A non-default installation of IE 5.01 SP1 or IE 5.5 also will eliminate this vulnerability, as long as an installation method is chosen that installs upgraded Outlook Express components. Note: When installed on a Windows 2000 machine, IE 5.5 does not install upgraded Outlook Express components, and therefore does not eliminate the vulnerability. However, Windows 2000 Service Pack 1 will install IE 5.5 and upgrade the Outlook Express components at the same time. Note: Patches will be available shortly that will eliminate the vulnerability without requiring a full version upgrade. When they are available, we will update this bulletin and re-release it. Note: Additional security patches are available at the Microsoft Download Center 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. Acknowledgments =============== Microsoft thanks USSR Labs (www.ussrback.com) for reporting this issue to us and working with us to protect customers. Revisions ========= - July 18, 2000: Bulletin Created. - ---------------------------------------------------------- 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 18,2000 (c) 2000 Microsoft Corporation. All rights reserved. Terms of use. -----BEGIN PGP SIGNATURE----- Version: PGP Personal Privacy 6.5.3 iQEVAwUBOXVWQ40ZSRQxA/UrAQGJEwf+K8F9KpiEtxihrCYnYugA8U3A0mF1c+rk 929pfyQsaZfWaMa+VNg5mXxWD6JkTeZs9xU90QTgKp0DjYOuVaf65Mh6eRc/byXr KjAUGVeemkwXoIL/YtGsupTUW5I1u9OIB02FDlQm8RVnQ2uM/hTa1M9eQoQSk1nI VFb0WESomJi6q8VKOm8QjC55zbq6wOWvGVFWzvXvaCN06I8fqe2YpKiqOHI/1dV2 yHZlMH41yl9zdZ0eu+A8vKBQtojLoPuHx3E9tT6K9K2GIHBuIRWprYJq9dOvSq1H kyCkQBOf9PDvjSsiGxZFln8jOOTA2WuLEJQ+nTFDy9mX0JR+2U1UXw== =AnnD -----END PGP SIGNATURE----- ******************************************************************* You have received this e-mail bulletin as a result of your registration to the Microsoft Product Security Notification Service. You may unsubscribe from this e-mail notification service at any time by sending an e-mail to MICROSOFT_SECURITY-SIGNOFF-REQUEST@ANNOUNCE.MICROSOFT.COM The subject line and message body are not used in processing the request, and can be anything you like. To verify the digital signature on this bulletin, please download our PGP key at http://www.microsoft.com/technet/security/notify.asp. For more information on the Microsoft Security Notification Service please visit http://www.microsoft.com/technet/security/notify.asp. For security-related information about Microsoft products, please visit the Microsoft Security Advisor web site at http://www.microsoft.com/security. ----------------------------------------------------------
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