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Vollständige Version anzeigen : Security Alert von Microsoft (MS04-011)


Günther Kramer
26.04.2004, 10:16
What is this alert?

- Microsoft is aware of code available on the Internet that seeks to exploit vulnerabilities addressed as part of our April 13th security updates. We are investigating the situation to help protect our customers. Specifically, the reports detail exploit code that attempts to use the IIS PCT/SSL vulnerability on servers running Internet Information Services with the Secure Socket Layer authentication enabled. This vulnerability is addressed by bulletin MS04-011. Customers who have deployed MS04-011 are not at risk from this exploit code.

- Microsoft considers these reports credible and serious and continues to urge all customers to immediately install the MS4-011 update as well as the other critical updates provided on April 13th.

- Customers who are still evaluating and testing MS04-011 should immediately implement the workaround steps detailed for the PCT/SSL vulnerability detailed in the MS04-011. In addition, Microsoft has published a knowledge base article KB187498 at http://support.microsoft.com/default.aspx?scid=kb;en-us;187498 which provides additional details on SSL and how to disable PCT without applying MS04-011.

- We expect to see additional exploits and proof-of-concept code targeting the April 2004 security bulletin release in coming days and weeks, potentially including worm or virus examples.

If you have any questions regarding the security updates or its implementation after reading the above listed bulletin you should contact Product Support Services in the United States at 1-866-PCSafety (1-866-727-2338). International customers should contact their local subsidiary.

Thank you,
Microsoft PSS Security Team

Günther Kramer
05.05.2004, 12:46
UPDATE (05/04/2004):
- This alert is being updated to advise you of an update to Microsoft Security Bulletin MS04-011. This update details additional workaround steps which customers can take to protect against the LSASS vulnerability (CAN-2003-0533). This is the vulnerability which is exploited by the Sasser worm and its variants. Customers who have not yet deployed the security update for MS04-011 can evaluate implementing this new workaround to protect against the Sasser worm and its variants.

- In addition, Microsoft has updated the cleanup tool for W32.Sasser.worm to remove the C and D variants of the Sasser worm. The Sasser removal tool now removes Sasser A, B, C and D. The updated removal tool is located at http://www.microsoft.com/downloads/details.aspx?FamilyId=76C6DE7E-1B6B-4FC3-90D4-9FA42D14CC17&displaylang=en and is documented in Knowledge Base article KB841720 http://support.microsoft.com/default.aspx?scid=kb;EN-US;841720.

What is this alert?

- Microsoft has been made aware of a worm identified as "W32.Sasser.worm" and it is currently circulating on the Internet. The worm exploits the Local Security Authority Subsystem Service (LSASS) vulnerability fixed in Microsoft Security Update MS04-011 on April 13, 2004.

- Microsoft encourages customers to protect themselves against this worm by installing Microsoft Security Bulletin MS04-011 <www.microsoft.com/technet/security/bulletin/ms04-011.mspx> immediately.

- Customers who have enabled the Windows XP Firewall are protected from the vector this worm attacks, which is TCP Port 139. Most third party firewalls also block this attack vector by default.

If you have any questions regarding the security updates or its implementation after reading the above listed bulletin you should contact Product Support Services in the United States at 1-866-PCSafety (1-866-727-2338). International customers should contact their local subsidiary.

Thank you,
Microsoft PSS Security Team