[Attacks and Exploits] A penetration tester is performing an authorized physical assessment. During the test, the tester observes an access control vestibule and on-site security guards near the entry door in the lobby. Which of the following is the best attack plan for the tester to use in order to gain access to the facility?

The most effective attack plan is tailgating during a busy period. This social engineering technique exploits the human tendency to be less vigilant when rushed or in a crowd. An access control vestibule (mantrap) and security guards are designed to prevent unauthorized entry, but their effectiveness diminishes during high-traffic times. An attacker can blend in with a group of legitimate employees, making it difficult for guards to challenge every individual and potentially bypassing the one-person-at-a-time mechanism of the vestibule if protocols are relaxed due to the rush. This method directly targets the weakest link—human factors—to achieve the primary goal of initial physical access.

A. Cloning a badge is a viable attack, but it is typically used to escalate privileges after gaining initial entry. It does not solve the immediate problem of bypassing the lobby's vestibule and guards.
C. Lock picking a rear entrance is a high-risk, conspicuous activity. It is more likely to trigger alarms or be observed on security cameras compared to a subtle social engineering approach at the main entrance.
D. Dropping USB devices is an attack designed to gain remote, logical access to the network. It does not achieve the stated objective of the physical assessment, which is to gain physical access to the facility.

1. National Institute of Standards and Technology (NIST). (2008). Special Publication 800-115

Technical Guide to Information Security Testing and Assessment.

Section 6.6

"Physical Penetration Testing

" lists "Tailgating—The attacker follows an authorized person through a secured entrance" as a primary technique for physical penetration testing. This source validates tailgating as a standard and recognized method for gaining unauthorized physical access.

2. Mouton

F.

Leenen

L.

& Venter

H. S. (2016). Social Engineering Attack Framework.

Section 4.2

"Attack Vectors

" categorizes tailgating as a "Physical-Social" attack vector. The framework highlights how attackers exploit human psychology and behavior to bypass physical security controls

which directly supports the rationale for choosing tailgating in a scenario with human guards. (Available via IEEE Xplore

DOI: 10.1109/ISTAFRICA.2016.7530606).

3. Massachusetts Institute of Technology (MIT) OpenCourseWare. (2014). 6.858 Computer Systems Security

Lecture 21: Physical Security.

The lecture notes discuss various methods for bypassing physical security. Social engineering tactics like tailgating are presented as highly effective

low-tech methods for gaining entry by exploiting human behavior

contrasting them with higher-risk technical attacks like lock picking. This supports tailgating as a "best" or most practical initial approach.