Valid Email Addresses - XSS and SQL Injection

Posted by PAAMAYIM_NEKUDOTAYIM on Stack Overflow See other posts from Stack Overflow or by PAAMAYIM_NEKUDOTAYIM
Published on 2010-05-27T18:01:52Z Indexed on 2010/05/27 18:31 UTC
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Filed under:

php

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xss

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sql-injection

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email-validation

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proof-of-concept

Since there are so many valid characters for email addresses, are there any valid email addresses that can in themselves be XSS attacks or SQL injections? I couldn't find any information on this on the web.

The local-part of the e-mail address may use any of these ASCII characters:

Uppercase and lowercase English letters (a–z, A–Z)

Digits 0 to 9

Characters ! # $ % & ' * + - / = ? ^ _ ` { | } ~

Character . (dot, period, full stop) provided that it is not the last character, and provided also that it does not appear two or more times consecutively (e.g. [email protected]).

http://en.wikipedia.org/wiki/E-mail_address#RFC_specification

I'm not asking how to prevent these attacks (I'm already using parametrized queries and HTML purifier), this is more a proof-of-concept.

The first thing that came to mind was 'OR [email protected], except that spaces are not allowed. Do all SQL injections require spaces?

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