Re: Positive Technologies Security Advisory 2003-0307: DoS-attack in Kerio WinRoute Firewall

[Peter Pentchev <roam () ringlet net>]

On Mon, Mar 31, 2003 at 10:00:26AM +0400, Dmitry Maksimov wrote:
[snip]
> Positive  Technologies  reports that single simple HTTP request to Kerio
> Winroute Firewall Web administration interface (TCP/4080)
>
> GET / HTTP/1.0
> Authorization: Basic XXX
>  
> instead of correct one:
>
> GET / HTTP/1.0
> Host: server
> Authorization: Basic XXX
>
>
> causes 100% CPU utilization of attacked computer.

Hmm.  Correct me if I'm wrong, but IMHO version 1.0 of the HTTP protocol
does *not* require a Host header in the request.  The Host header is a
requirement in HTTP/1.1 for virtual hosting, isn't it?  Thus, an
HTTP/1.0 request without a Host header is perfectly valid, and expected.
This would mean that this application breaks not only on invalid
requests, but also on legitimate ones.

G'luck,
Peter

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Peter Pentchev  roam () ringlet net    roam () sbnd net    roam () FreeBSD org
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