Extended validation certificates and XSS considered harmful

Wednesday, 27 February 2008, 4:33 PM EST

A cross-site scripting vulnerability on the popular SourceForge.net website shows how Extended Validation SSL certificates could be exploited by fraudsters. Piggybacking on the anticipated extra trust instilled by the presence of an EV SSL certificate, arbitrary content could be injected onto the secure page at SourceForge to create a very convincing phishing attack. The green address bar displayed by the web browser would assure users that they are looking at a website that can be trusted, even though the page they are looking at may contain scripts or HTML created by a remote attacker.

At Netcraft.

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