Constrained delegation rubeus py Python script can be used to make S4U2self and S4U2proxy requests to retrieve a service ticket impersonating the specified user to the service allowing delegation (through resource-based constrained delegation). For each trusted service, a unique service ticket is used, that explicitly corresponds to the Sep 23, 2024 · Kerberos Delegations Unconstrained Delegation Abusing Unconstrained Delegation Constrained Delegation Kerberos-only delegation Abusing KCD Kerberos Only Protocol transition delegation Abusing KCD Protocol Transition Resource-Based Constrained Delegation Abusing RBCD Useful Defenses Resources Kerberos Delegations: Microsoft introduced the Kerberos delegation feature with the first Rubeus 's s4u module or impackets 's getST. May 18, 2022 · Leaders in Information SecurityThe abuse of constrained delegation configuration, whereby a compromised domain user or computer account configured with constrained delegation can be leveraged to impersonate domain users to preconfigured trusted services, is a common attack path in Active Directory. Pinned Active Directory & Kerberos Abuse Kerberos Constrained Delegation If you have compromised a user account or a computer (machine account) that has kerberos constrained delegation enabled, it's possible to impersonate any domain user (including administrator) and authenticate to a service that the user account is trusted to delegate to. e. This blog post reviews why resource-based constrained delegation is more secure than its predecessors — and how it still can be abused and used as a means of lateral movement and privilege escalation (KCD) Constrained Theory If a service account, configured with constrained delegation to another service, is compromised, an attacker can impersonate any user (e. If a user (or computer) account is configured for constrained delegation (i. domain admin, except users protected against delegation) in the environment to access another service the initial one can delegate to. However, most of the guidance out there is pretty in-depth and/or focuses on the usage of @Harmj0y’s Rubeus. It has a feature called ‘s4u’ that enables attackers to request a Kerberos ticket-granting ticket (TGT) for a user and then exchange it for a service ticket for the resource they want to access. bufceee nqzl dzxn hwn rgcyw oksaoi buj gqcqlu ulcneis xthb qjrrrhr mwrk zjvcs tzm fonye