XSS via curl

From: Date: Wed, 30 Nov 2005 14:59:05 +0000
Subject: XSS via curl
Groups: php.general 
Request: Send a blank email to php-general+get-226644@lists.php.net to get a copy of this message
My company uses a home-grown formmail script for clients <groan>, and someone is using curl to inject HTTP headers and spam email addresses, and turn it into an open relay. Yes, I know the right answer is to not use a formmail, but I don't make the rules here. Is there a way to detect that a script is being accessed by curl, and not by a browser? ENV ($_SERVER) variables won't work, as those can be forged. Thanks. Sandy Keathley

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