Kerberos failed before anyone touched the system.
The service account’s ticket was valid, the encryption was intact, and the timestamps matched. Everything looked fine—until you saw the principal name. It didn’t belong to a person. It belonged to a script.
This is the reality of Kerberos non-human identities: accounts that hold the keys to automation, services, daemons, and scheduled jobs. They never sleep. They never log off. And their privileges can cut deeper than almost any user's.
What Are Kerberos Non-Human Identities
A Kerberos non-human identity is any principal in the Key Distribution Center (KDC) that represents a machine or a process instead of a person. Service accounts, application identities, and automated workflow accounts all fall into this category. Their credentials are often stored in plaintext or poorly secured locations.
Because they’re not tied to human activity, they don’t benefit from MFA or behavioral monitoring. They can exist for years without rotation. In many environments, these accounts have privileges that exceed those of most administrators.
Why They Matter
Attackers know the value of Kerberos non-human identities. If compromised, they can be used to impersonate services, pivot across realms, extract sensitive data, and maintain long-term persistence. Standard security controls often miss them because non-human identities don’t follow normal login patterns.
A vulnerability in one of these accounts won’t just grant access—it can turn the compromise into a silent backdoor that blends with daily operations.
Common Weaknesses
- Static credentials: Passwords or keys that haven’t changed for years.
- Overprivileged accounts: Privileges far beyond what the associated process needs.
- Excessive ticket lifetimes: Giving attackers more time to exploit access.
- Service Principal Name (SPN) exposure: Gaps in SPN management leading to kerberoasting attacks.
Securing Non-Human Identities in Kerberos
- Rotate credentials regularly to minimize damage from leaks or exposure.
- Apply least privilege: Restrict access to exactly what the service needs.
- Shorten ticket lifetimes for sensitive accounts.
- Monitor Kerberos traffic for irregular patterns in service account activity.
- Audit SPNs to ensure they align with actual services.
The Real Challenge
Finding these accounts in the first place can be harder than securing them. Large organizations often run hundreds of non-human identities spread across domains, realms, and legacy systems. Many have no central registry.
Automated discovery and policy enforcement give you a real edge. Without them, non-human identities remain an unseen asset—and an unseen threat.
See It Live
You can surface every Kerberos non-human identity in your environment in minutes. No scripts to maintain. No config files to chase. See how at hoop.dev and take control before someone else does.