Re: Code Red: What security specialist don't mention in warnings (Frank Knobbe)

[Joseph Steinberg <Joseph () whale-com com>]

> Web servers should only respond to incoming web requests. Web servers do
not need to
> establish connections to the Internet. So if a web server is behind a
> stateful firewall, and the firewall rules allow incoming web request to the
> web server, but denies outgoing connections from the web server to the
> Internet, then the Code Red worm can be contained. 

Depends on the application and the location of the web server -- it may need
to access content from the internet...

Also, what if your web server needs to send outbound email (confirmation
messages, etc.)...

BTW: The generic Code Red worm may just deface and connect outward, but the
same vulnerability could have been exploited to steal the information on the
web server, or turn it into a host for a staged attack against other
DMZ/internal machines. As the vulnerability is at the application-level, a
firewall will not likely mitigate against this.



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