On Tue, Jul 14, 2009 at 7:46 AM, Tiji varghese<tij...@yahoo.co.in> wrote:
> I've implemented a contact form on my website that would email me the
> contents of the form and also add it to the database. Its working perfectly
> but I'm not too sure about the security part. I don't know much about the
> security issues concerned with email forms and the measures to check it.
> Please help.
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The main thing to be aware of would be 'email header injection.' Do
not allow returns/newlines in any of the mail header fields you
populate from user input. Also require a valid email address and
verify that it has a valid domain name.
Next up would just be the annoyance of a client receiving tons of spam
messages. There are a lot of automated programs crawling the web just
filling out every form it finds looking for vulns to exploit. Even if
your form has no holes in it, the client will still get all of this
unwanted junk from the automated tests. You can try to come up with
some clever ways of stopping that.
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