Certified Ethical Hacker Certification (CEHv10) Practice Test

Horizontal privilege escalation involves acquiring privileges of the same level, which typically means that a user gains access to accounts or resources that they normally shouldn’t be able to access, without changing their own privilege level. In this scenario, a user may exploit a vulnerability to access other users’ data, files, or functionalities that are meant for other users with the same kind of permissions, rather than gaining higher privileges or access to restricted administrative functions.

This concept is important in penetration testing and ethical hacking because it highlights the risks associated with user-level security controls. Effective security measures must ensure that users can only access their own data and that proper constraints are in place to prevent unauthorized access to other users' information.

Other options, such as vertical privilege escalation, refer to gaining higher privileges (for example, a standard user gaining administrative rights), and a denial of service attack is focused on making systems unavailable rather than gaining privileges. Privilege misconfiguration often relates to improper settings that inadvertently grant excessive access, but it doesn’t describe the action of one user accessing another user’s same-level resources.