The clearest warning signs are a Windows Server 2025 domain controller, delegated OU permissions granted to operational teams, and unrestricted dMSA creation. Excessive rights such as CreateChild or GenericAll are especially concerning. If those conditions exist together, the environment may already contain an abuse path that an attacker can turn into escalation.
What to look for before you assume the environment is exposed
BadSuccessor abuse becomes plausible when delegation and object creation are looser than the domain’s trust model assumes. The warning signs are not subtle once you inspect the directory design: a Windows Server 2025 domain controller, operational teams with delegated OU rights, and the ability to create dMSAs without tight approval or scoping. Those conditions matter because they turn routine administration into a path an adversary can abuse for privilege escalation.
Excessive directory rights are the strongest signal. CreateChild, GenericAll, or similarly broad permissions on organisational units can let an attacker shape the environment around a privileged object rather than “break in” through a normal login path. That is why this issue is less about one risky permission and more about whether creation, delegation, and ownership boundaries have been separated cleanly. The NHI Management Group’s research on NHIs also shows why these exposures persist: only 5.7% of organisations report full visibility into service accounts, which is a useful reminder that delegated machine-style identities are often under-governed even when teams believe they are well controlled. In practice, many security teams discover the dangerous combination only after delegated administration has already been granted broadly and used repeatedly.
How the abuse path emerges in practice
The practical test is whether an attacker can move from ordinary delegated rights to the creation or manipulation of a privileged identity construct. In a well-controlled directory, operational teams may manage objects in a limited scope, but they should not be able to create identities or attributes that can later be converted into escalation. BadSuccessor abuse becomes relevant when those boundaries are blurred and the environment treats delegated administration as inherently safe.
Look for these conditions together:
- A Windows Server 2025 domain controller is present, because the abuse path depends on the relevant directory behaviour.
- Delegated OU permissions exist for help desk, server operations, or application teams.
- Those delegated permissions include object creation or full-control style rights.
- dMSA creation is available without strong approval, tiering, or ownership checks.
- There is no effective review of who can create, link, or modify the objects that matter most.
That pattern is dangerous because privilege is no longer limited to users who hold explicit administrative roles. An attacker who gains access to a delegated account can use the directory’s own control model against itself. The NIST SP 800-53 Rev 5 Security and Privacy Controls are relevant here because they reinforce the need to limit privileged functions and monitor account management, while the Ultimate Guide to NHIs is useful for thinking about how machine-style identities become risky when ownership, visibility, and lifecycle controls are weak. These controls tend to break down when delegation is inherited across large OUs and no one can clearly explain who is authorised to create or modify the identity objects involved.
Where the edge cases and false positives sit
Tighter delegation often improves security but increases administrative friction, so teams sometimes accept broader rights to keep operations moving. That tradeoff is real, but it should be explicit rather than accidental. A single delegated permission does not automatically mean an environment is vulnerable; the question is whether that permission combines with object creation rights, privileged directory features, and weak oversight in a way that creates a usable escalation path.
There is also a difference between managed delegation and open-ended trust. For example, an OU can be delegated for routine maintenance without being dangerous if the scope is narrow, the actions are logged, and creation rights are separated from privileged identity management. Current guidance suggests treating dMSA creation like any other high-impact identity change: it needs ownership, review, and auditability, even if the surrounding team already has operational access. The strongest false positive is assuming that “delegated” means “safe” simply because the rights were granted intentionally. The more useful question is whether those rights allow a lower-trust team to introduce an object that inherits more trust than the team itself deserves.
Risk and Threat Considerations
BadSuccessor-style exposure is primarily a privilege escalation and trust-abuse risk. The danger is not the presence of delegation by itself, but the combination of broad directory permissions, machine-identity creation, and insufficient control over who can author or modify high-value objects. That creates a path where ordinary administrative access can be transformed into higher privilege than intended.
Failure mechanism: An attacker abuses delegated rights such as object creation or full control to introduce or alter directory objects that are later treated as trusted for sensitive operations. The environment fails when creation authority, approval, and monitoring are not separated from routine operational delegation.
Impact: Privilege boundaries collapse, escalation becomes possible without overt admin compromise, and the directory may contain a latent abuse path that is hard to distinguish from legitimate administration until it is already in use.
Standards & Framework Alignment
This section maps relevant standards and security frameworks to the operational risks and controls described in this guidance.
MITRE ATT&CK and OWASP Non-Human Identity Top 10 address the attack and risk surface, while CIS Controls v8, NIST CSF 2.0 and NIST Zero Trust (SP 800-207) set the governance and control requirements practitioners need to meet.
| Framework | Control / Reference | Relevance |
|---|---|---|
| CIS Controls v8 | 5 — Account Management | Delegated OU and dMSA creation are account control issues that need review and restriction. |
| Recommendation — Restrict delegated account-creation rights and review privileged account ownership regularly. | ||
| NIST CSF 2.0 | PR.AC-4 — Access Permissions are Managed | Excessive OU permissions and broad creation rights indicate unmanaged access scope. |
| Recommendation — Enforce least privilege on directory permissions and remove unnecessary creation authority. | ||
| NIST Zero Trust (SP 800-207) | AC-6 — Least Privilege and Permissions | BadSuccessor signs point to excessive authority in a trust boundary that should be tightly scoped. |
| Recommendation — Limit directory rights to the minimum needed for each operational role. | ||
| MITRE ATT&CK | T1068 — Exploitation for Privilege Escalation | The abuse path is a directory-based route from delegated rights to higher privilege. |
| Recommendation — Map suspicious directory object creation to privilege-escalation hunting and containment. | ||
| OWASP Non-Human Identity Top 10 | NHI-02 — Privilege and Access Scope | dMSA creation and delegated control are NHI-style machine identity scope risks. |
| Recommendation — Inventory machine identities and constrain who can create or expand their access scope. | ||
Practitioner Guidance
What to prioritise: Review any Windows Server 2025 domain controller environment first where operational teams have delegated OU permissions. The highest-risk combination is delegated control plus object creation plus weak review, because that is where abuse paths are most likely to exist.
What to verify: Confirm who can create dMSAs, who can delegate or inherit those rights, and whether any non-administrative team can reach CreateChild, GenericAll, or similar high-impact permissions on sensitive OUs. If the answer is not immediately auditable, treat the environment as suspect until proven otherwise.
Practitioner takeaway: The key judgement is not whether delegation exists, but whether delegation can be used to manufacture privilege faster than the organisation can detect and constrain it.
