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The Microsoft Security Response Center, along with other
organizations listed below, is jointly publishing this alert that
ALL IIS ADMINISTRATORS ARE ASKED TO READ

A Very Real and Present Threat to the Internet:
July 31 Deadline For Action

Summary:

The Code Red Worm and mutations of the worm pose a
continued and serious threat to Internet users. Immediate action
is required to combat this threat. Users who have deployed
software that is vulnerable to the worm (Microsoft IIS
Versions 4.0 and 5.0) must install, if they have not done so
already, a vital security patch.

How Big Is The Problem?

On July 19, the Code Red worm infected more than 250,000 systems
in just 9 hours. The worm scans the Internet, identifies
vulnerable systems, and infects these systems by installing
itself. Each newly installed worm joins all the others causing
the rate of scanning to grow rapidly. This uncontrolled growth
in scanning directly decreases the speed of the Internet and
can cause sporadic but widespread outages among all types of
systems. Code Red is likely to start spreading again on
July 31st, 2001 8:00 PM EDT and has mutated so that it may be
even more dangerous. This spread has the potential to disrupt
business and personal use of the Internet for applications such
as electronic commerce, email and entertainment.

Who Must Act?

Every organization or person who has Windows NT or Windows 2000
systems AND the IIS web server software may be vulnerable.
IIS is installed automatically for many applications. If you
are not certain, follow the instructions attached to determine
whether you are running IIS 4.0 or 5.0. If you are using
Windows 95, Windows 98, or Windows Me, there is no action that
you need to take in response to this alert.

What To Do If You Are Vulnerable?

a. To rid your machine of the current worm, reboot your computer.
b. To protect your system from re-infection:
Install Microsoft's patch for the Code Red vulnerability problem:

- - Windows NT version 4.0:
  http://www.microsoft.com/Downloads/Release.asp?ReleaseID=30833

- - Windows 2000 Professional, Server and Advanced Server:
  http://www.microsoft.com/Downloads/Release.asp?ReleaseID=30800

Step-by-step instructions for these actions are posted at
http://www.microsoft.com/technet/treeview/default.asp?
url=/technet/itsolutions/security/topics/codeptch.asp

Microsoft's description of the patch and its installation,
and the vulnerability it addresses is posted at:
http://www.microsoft.com/technet/treeview/default.asp?
url=/technet/security/bulletin/MS01-033.asp

Because of the importance of this threat, this alert is
being made jointly by:

Microsoft
The National Infrastructure Protection Center
Federal Computer Incident Response Center (FedCIRC)
Information Technology Association of America (ITAA)
CERT Coordination Center
SANS Institute
Internet Security Systems
Internet Security Alliance

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