Which of the following is NOT classified as a host threat type?

The correct choice indicates that social engineering is not classified as a host threat type. Host threats typically refer to those threats that target a specific computer or device, which often involves direct attacks or software-based issues that affect the host's integrity and operation.

Social engineering, on the other hand, is a method by which attackers manipulate people into divulging confidential information or performing actions that compromise security. It primarily focuses on exploiting human psychology rather than targeting the host system directly. Although it can lead to incidents that affect hosts, such as providing access to malware or sensitive data, it doesn’t involve a direct assault on the host itself.

In contrast, malware attacks compromise a host by introducing harmful software. Physical security threats involve physical access to the host, potentially leading to direct damage or data theft. Hash injection attacks target specific vulnerabilities in an application but are still aimed at exploiting the host’s operations. Thus, social engineering stands apart from these other categories, emphasizing the human aspect over direct technical or physical threats to host systems.