Follow the ghostly blue studs to the left until you find the object with two green handles. Use Cyborg's Giant Suit to grab the handles and remove the object. Now use the Giant Suit to smash through the cracked door just beyond and into Level 4.
Halderman explained that the student had used a technique called Shell Injection Vulnerability. He found a single, wayward quotation mark in the code, a crack in the floorboard through which they drove a tractor -trailer of attack commands. 2b1af7f3a8