Using a heuristic system to detect an anomaly in a computer’s baseline, a system
administrator was able to detect an attack even though the company signature based IDS
and antivirus did not detect it. Further analysis revealed that the attacker had downloaded an
executable file onto the company PC from the USB port, and executed it to trigger a privilege
escalation flaw. Which of the following attacks has MOST likely occurred?

A.
Cookie stealing

B.
Zero-day

C.
Directory traversal

D.
XML injection