Frank uses an on-path attack to cause a system to send HTTP traffic to his system and then forwards it to the actual server the traffic is intended for. What type of password attack can he conduct with the data he collects if he captures all the traffic from a login form?

Since Frank is able to view the web traffic before it is sent to the actual server, he should be able to conduct a plain-text password attack by intercepting the password. Pass-the-hash attacks are typically used inside Windows environments, SQL injection would attack the server, and cross-site scripting is possible but not as likely as the plain-text password attack in this scenario.