How privilege escalation works
Privilege escalation takes two forms. Vertical escalation moves from a low-privilege account to a higher one, such as administrator or root. Horizontal escalation uses another user's access at the same level to reach different data.
Common causes include unpatched operating system flaws, weak service permissions, exposed credentials in scripts, misconfigured cloud roles, and tricking users into granting access. Attackers then disable security tools, dump more credentials and reach domain controllers or cloud management consoles. Cloud environments add new routes, such as roles that allow users to grant themselves more access.
Why it matters for Canadian organizations
Initial footholds are often low-privilege, such as a phished employee account. Escalation is what turns that small foothold into a full compromise affecting databases, backups and customer records, and can convert a minor event into a reportable breach under PIPEDA or Law 25.
Detecting escalation attempts gives defenders a chance to interrupt an attack before data is stolen or ransomware is deployed, which makes it a priority in monitoring and in penetration test scoping. Escalation often follows credential theft, so protecting privileged accounts is a high priority.
How to defend against it
Apply least privilege and remove unnecessary local administrator rights. Patch operating systems and applications promptly, harden service configurations, protect credentials with vaulting and multi-factor authentication, and review cloud roles for excessive permissions.
Monitor for signs such as new administrator accounts, changes to privileged groups, unusual token or credential access and use of known escalation tools. Penetration testing helps find escalation paths before attackers do. Test your fixes with a repeat assessment. Include escalation paths in penetration test objectives and verify that your monitoring would catch them.
Frequently asked questions
What is the difference between vertical and horizontal privilege escalation?
Vertical escalation gains higher-level permissions, such as moving from user to administrator. Horizontal escalation accesses another user's resources at the same permission level. Both types are common in real attacks and often occur in sequence.
How do attackers escalate privileges?
They exploit unpatched software, misconfigured permissions, weak or reused credentials, exposed secrets and overly broad roles. They also use stolen tokens and trick users or administrators into approving access. Fixing the underlying weakness is more effective than treating symptoms.
How can I detect privilege escalation?
Monitor logs for changes to privileged groups, new administrator accounts, unusual use of administrative tools and unexpected authentication events. A SIEM or EDR platform with tuned detections helps surface these quickly. Alert on privileged group changes and review them promptly.
Related service: Penetration testing