Re: malicious requests?

Hey Alex,

a trailing . in the host header is valid per RFC 3986: http://tools.ietf.org/html/rfc3986#section-3.2.2:

The rightmost domain label of a fully qualified domain name in DNS may be followed by a single "."

/Markus 

On Monday, December 22, 2014 12:44:25 PM UTC+1, Alex Haylock wrote:

Are there any known attack vectors that involve appending a period/
full-stop to a sites domain name?

My Django application throws a handful of errors in production every day:

ERROR: Invalid HTTP_HOST header: 'www.example.com.'. You may need to add
u'www.example.com.' to ALLOWED_HOSTS.

(note the trailing period)

Is this malicious behaviour, or just users mistyping the URL?

Also, browsers are clearly treating the final '.' as part of the path
(as these requests are reaching my application), but Django is treating
the '.' as part of the hostname. Which is right?

--
Regards,


Alex

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