exploiting-constrained-delegation-abuse
by mukul975The exploiting-constrained-delegation-abuse skill guides authorized Active Directory testing of Kerberos constrained delegation abuse. It covers enumeration, S4U2self and S4U2proxy ticket requests, and practical paths to lateral movement or privilege escalation. Use it when you need a repeatable guide for penetration testing, not a generic Kerberos overview.
This skill scores 68/100, which means it is worth listing but best presented with caution. The repository contains real constrained-delegation abuse workflow content, a supporting script, and reference material, so directory users can likely understand what it does and when to use it. However, the operational path is not fully packaged for low-guesswork execution, so users should expect to do some adaptation.
- Explicit trigger and scope: the skill clearly targets Kerberos constrained delegation abuse in Active Directory and names S4U2self/S4U2proxy as the core workflow.
- Substantial workflow support: SKILL.md is non-placeholder and includes multiple headings, code fences, and repo-linked references, which improves agent navigation.
- Practical artifacts included: a Python agent script plus references for API, standards, and workflows provide reusable context beyond prose alone.
- No install command in SKILL.md, so adoption may require manual setup or inference about how to run the skill.
- Evidence suggests offensive tradecraft focus with some workflow detail but limited visible constraints/quick-start guidance, which may leave agents with some execution guesswork.
Overview of exploiting-constrained-delegation-abuse skill
What this skill does
The exploiting-constrained-delegation-abuse skill helps you plan and execute authorized testing of Kerberos Constrained Delegation abuse in Active Directory. It focuses on the practical attack chain: identify delegation misconfigurations, obtain usable service credentials, request tickets with S4U2self and S4U2proxy, and use those tickets for lateral movement or privilege escalation.
Who should install it
Install exploiting-constrained-delegation-abuse if you do red-team work, internal penetration testing, or AD security validation and need a repeatable workflow instead of a one-off prompt. It is most useful when you already have a foothold or a service account and need to determine whether delegation settings allow impersonation of privileged users.
Why it stands out
This exploiting-constrained-delegation-abuse guide is more specific than a generic Kerberos prompt because it links enumeration, ticket abuse, and follow-on access paths. The supporting references and script point you toward concrete AD queries, Impacket/Rubeus usage, and decision points that matter in real environments.
How to Use exploiting-constrained-delegation-abuse skill
Install and inspect the skill
Use the repository install flow shown in the directory:
npx skills add mukul975/Anthropic-Cybersecurity-Skills --skill exploiting-constrained-delegation-abuse
After install, read SKILL.md first, then references/api-reference.md, references/workflows.md, and references/standards.md. If you want operational context, inspect scripts/agent.py to see how enumeration is automated and what platform assumptions it makes.
Feed it the right starting input
The best exploiting-constrained-delegation-abuse usage starts with a narrow objective, not a vague ask. Good inputs include:
- “We have a service account with constrained delegation to
cifs/DC01; can it impersonateadministrator?” - “Enumerate delegation paths that could lead to DCSync in this lab.”
- “Turn this PowerView output into an S4U test plan.”
Include domain name, known accounts, target SPNs, whether you have a password/hash/TGT, and your execution environment. Without those details, the skill will stay at theory level.
Use a practical workflow
A strong exploiting-constrained-delegation-abuse install is only useful if you work in this order:
- Enumerate constrained delegation or RBCD targets.
- Confirm whether
TrustedToAuthForDelegationor a writable computer object changes the risk. - Choose the right tool path: Impacket for Linux-based testing, Rubeus for Windows validation.
- Test S4U2self and S4U2proxy against the intended SPN.
- Validate whether the ticket can reach CIFS, LDAP, or HTTP before claiming escalation.
Prompt shape that gets better output
Use prompt structure that mirrors the attack chain:
- Goal: “validate delegation abuse”
- Inputs: account, SPN, domain controller, ticket material
- Constraints: OS, tool preference, no destructive actions
- Output format: enumeration commands, validation steps, and rollback notes
This makes the exploiting-constrained-delegation-abuse skill produce a usable guide instead of a broad explanation.
exploiting-constrained-delegation-abuse skill FAQ
Is this only for penetration testing?
Yes. exploiting-constrained-delegation-abuse for Penetration Testing is the intended use. The skill is centered on authorized assessment, lab validation, and red-team workflows, not unsanctioned access.
Do I need deep Kerberos knowledge first?
No, but you do need enough AD context to recognize service accounts, SPNs, and ticket-based auth. The skill is beginner-friendly for guided testing, but it is not a substitute for understanding the target environment.
How is this different from a normal prompt?
A normal prompt may explain constrained delegation in general. This skill is better when you need a repeatable exploiting-constrained-delegation-abuse guide that ties enumeration to concrete commands, tool choices, and likely abuse paths.
When should I not use it?
Do not use it if you only need a high-level security overview, if your environment blocks ticket tooling entirely, or if you lack authorization and scope. It is also a poor fit when the problem is generic AD hardening rather than delegation abuse testing.
How to Improve exploiting-constrained-delegation-abuse skill
Provide the exact AD facts you know
The strongest results come from inputs that include:
- Domain and DC names
- Account type: user, service, or machine account
- Delegation type: constrained, constrained with protocol transition, or RBCD
- SPNs in scope
- Credential material available: password, NTLM hash, AES key, TGT, or none
The more exact your starting state, the less the skill has to guess.
Ask for one validation path at a time
If you want better exploiting-constrained-delegation-abuse usage, split the request into separate passes: discovery, ticket acquisition, and service validation. This reduces noise and makes it easier to catch whether the issue is enumeration, authentication material, or SPN targeting.
Watch for common failure modes
Most weak outcomes come from missing SPN detail, confusing constrained delegation with RBCD, or assuming every ticket works against every service. Another common miss is forgetting that platform and tool matter: the script is Windows-oriented, while Impacket and Rubeus have different operational assumptions.
Iterate with concrete outputs
After the first run, feed back actual findings: the delegated SPNs, error messages, ticket artifacts, or blocked access attempts. Then ask the skill to refine the next step, such as switching from CIFS validation to LDAP-based abuse or narrowing to a single target host.