Menu

Individual skill

exploiting-constrained-delegation-abuse

0upvotes

Exploits Kerberos Constrained Delegation misconfigurations in Active Directory using Impacket's findDelegation.py and getST.py (or Rubeus/Kekeo on Windows) to abuse S4U2Self and S4U2Proxy and impersonate privileged users. Use during authorized Active Directory penetration tests or red-team engagements for lateral movement and privilege escalation after finding an account trusted for constrained delegation.

skills/exploiting-constrained-delegation-abuse/SKILL.md

Read pinned source

Source commit 54a798831d2266a3ca61ce68a7acb80b81160d57

What was checked

Matches the observed repository HEAD
Yes
Scanner rules are current
Yes
Repository scan complete
No
Skill scan complete
No
Observed behavior
Network or broad shell
Last checked
Nov 9, 2026

These are observations at the recorded commit, not a guarantee of safety. Review the source before running it.

Install this skill

Choose an agent in your Stack or copy a command below. Commands fetch the pinned commit and copy only this skill directory. Existing destinations are refused. Copying a command does not install anything.

An install command is unavailable: current rules, complete repository and skill scans, an eligible behavior level and a permitted license are required.

Repository context

Repository stars (not skill ratings)
35,849
Repository last updated
Aug 31, 2026
License
Apache-2.0

Observed agent integration: No specific integration evidence. Standard SKILL.md installation does not imply verified compatibility.

Files and excerpt

File metadata and permitted, redacted excerpts come from the recorded scan. Source links are pinned to that commit.

Browse files
Read excerpt
# Exploiting Constrained Delegation Abuse


> **Legal Notice:** This skill is for authorized security testing and educational purposes only. Unauthorized use against systems you do not own or have written permission to test is illegal and may violate computer fraud laws.

## Overview

Kerberos Constrained Delegation (KCD) is a Windows Active Directory feature that allows a service to impersonate a user and access specific services on their behalf. The delegation targets are defined in the msDS-AllowedToDelegateTo attribute. When an attacker compromises an account configured with Constrained Delegation (particularly with the TRUSTED_TO_AUTH_FOR_DELEGATION flag), they can use the S4U2self and S4U2proxy Kerberos protocol extensions to request service tickets as any user (including Domain Admins) to the delegated services. If the delegation target includes services like CIFS, HTTP, or LDAP on a Domain Controller, this results in full domain compromise. The S4U2self extension requests a forwardable ticket on behalf of any user to the compromised service, and S4U2proxy forwards that ticket to the allowed delegation target.


## When to Use

- When performing authorized security testing that involves exploiting constrained delegation abuse
- When analyzing malware samples or attack artifacts in a controlled environment
- When conducting red team exercises or penetration testing engagements
Back to top