Exam CS0-001 topic 1 question 326 discussion

Due to a security breach initiated from South America, the Chief Security Officer (CSO) instructed a team to design and implement an appropriate security control to prevent such an attack from reoccurring. The company has sales and consulting teams across the United States that need access to company resources. The security manager implemented a location-based authentication to prevent non-US-based access to the company networks. Three months later, the same incident reoccurred with an attack originating from a country in Asia. Which of the following security design defects could be the cause?