Eliminating Azure Custom Owner Roles for Better Governance

Overview

Effective cloud governance hinges on a robust Identity and Access Management (IAM) strategy. Within the Microsoft Azure environment, a common but significant security gap emerges from the creation of custom owner roles. These are user-defined roles that grant full administrative privileges, often using a wildcard (*) permission, across an entire subscription. This practice directly contradicts the Principle of Least Privilege (PoLP) and creates “shadow admins” that can bypass standard security monitoring.

While Azure provides a built-in “Owner” role for necessary administrative tasks, duplicating its all-powerful permissions in a custom role introduces unnecessary risk. Such roles expand the potential attack surface, obscure clear lines of accountability, and create long-term management overhead. Proactively identifying and eliminating these custom roles is a critical step toward securing an Azure environment, ensuring compliance, and maintaining cost control.

Why It Matters for FinOps

From a FinOps perspective, unmanaged administrative access is a direct financial threat. A compromised account with custom owner privileges can inflict significant damage, from spinning up costly, unauthorized resources to deleting critical production infrastructure, causing revenue-impacting outages. The existence of these roles complicates chargeback and showback efforts, as it becomes difficult to attribute actions to a clearly defined, purpose-built role.

Furthermore, custom owner roles create audit friction. During compliance reviews for frameworks like SOC 2, PCI-DSS, or ISO 27001, auditors scrutinize privileged access. Discovering ambiguously named roles with full administrative power often results in findings that require expensive and time-consuming remediation. This operational drag translates directly into higher costs, delayed projects, and a weakened governance posture.

What Counts as “Idle” in This Article

In the context of this article, we are not targeting idle resources but rather a form of “governance waste.” A “Custom Owner Role” refers to any user-created role definition in Azure that meets specific high-risk criteria.

The primary signal of such a role is the use of a wildcard permission (*) in its Actions definition. This single character grants the role not only every permission that currently exists but also any permission that Azure might add in the future. When this all-encompassing permission is combined with an assignable scope at the subscription level, it effectively creates a duplicate of the built-in Owner role, undermining the security and clarity that standard roles provide.

Common Scenarios

Scenario 1

An engineering lead requests “owner-like” access but wants a role named after their team, like “DataPlatform-Admin.” To fulfill the request quickly, an administrator clones the built-in Owner role, gives it a new name, and assigns it. This creates a shadow admin account that might be overlooked in standard audits that only search for the official “Owner” role.

Scenario 2

An organization needs to grant a user nearly full control but wants to prevent them from deleting a specific critical resource. They create a custom role with Actions: * and add a NotActions rule to block the specific delete permission. This creates a false sense of security, as the user can still modify IAM permissions to remove the restriction from their own account.

Scenario 3

During a migration from an on-premises data center, old permission models are hastily mapped to Azure. A legacy “System Administrator” role that had sweeping permissions is replicated as a custom Azure role with wildcard access. This role persists for years, its powerful permissions unreviewed and assigned to users or service principals who no longer require them.

Risks and Trade-offs

The primary risk of allowing custom owner roles is the complete violation of the Principle of Least Privilege. If an account assigned such a role is compromised, the attacker gains full control over the entire subscription. They can exfiltrate data, destroy resources, and create persistent backdoors by assigning other roles. The perceived trade-off is often convenience—it seems easier to grant broad access than to define a granular, purpose-built role. However, this convenience comes at the cost of immense security and financial risk.

Another significant risk is the potential for operational accidents. A user with an innocuously named custom role might not realize they have the power to delete an entire resource group. They could run a cleanup script that inadvertently destroys production assets, leading to costly downtime and data loss. This lack of clarity makes the environment fragile and harder to manage safely at scale.

Recommended Guardrails

Strong governance is the most effective way to prevent the proliferation of custom owner roles. This starts with establishing clear policies that forbid the creation of custom roles with wildcard (*) permissions at the subscription scope.

Implement a robust tagging and ownership strategy to ensure every resource and role assignment has a clear owner and business justification. Use Azure’s native tooling to build automated guardrails. For instance, an Azure Policy can be configured to audit for or even deny the creation of any new custom role definition that contains wildcard actions. For users who genuinely need temporary elevated access, leverage just-in-time (JIT) systems to grant permissions for a limited duration with an approval workflow, rather than using a permanent, standing assignment.

Provider Notes

Azure

In Azure, access control is managed through Role-Based Access Control (RBAC). While Azure provides a rich library of built-in roles, it also allows for the creation of custom roles for granular needs. The key is to ensure these custom roles are narrowly scoped and do not use wildcards. To prevent the creation of overly permissive roles, organizations should leverage Azure Policy to enforce IAM best practices. For legitimate administrative needs, Azure AD Privileged Identity Management (PIM) is the recommended solution for providing time-bound, auditable, and approval-gated access.

Binadox Operational Playbook

Binadox Insight: The most dangerous security vulnerabilities are often not exploits, but misconfigurations. A custom role with a wildcard permission is a ticking time bomb, creating a “shadow admin” that undermines both security and financial governance by making accountability and control nearly impossible.

Binadox Checklist:

• Systematically audit all Azure subscriptions for custom RBAC roles.
• Inspect the JSON definition of each custom role, specifically searching for the * wildcard in the Actions property.
• Identify all users, groups, and service principals assigned to these high-risk roles.
• Before deletion, map assignees to more appropriate, granular built-in Azure roles.
• Implement an Azure Policy to audit or deny the creation of new custom roles containing wildcards.
• Mandate the use of Azure AD PIM for any necessary temporary elevation of privileges.

Binadox KPIs to Track:

• Number of custom roles with wildcard permissions across all subscriptions.
• Percentage of privileged users managed via Just-In-Time (JIT) access vs. standing permissions.
• Mean Time to Remediate (MTTR) for high-risk IAM configuration alerts.
• Number of audit findings related to excessive permissions per quarter.

Binadox Common Pitfalls:

• Deleting a custom role before migrating its assigned users to new roles, causing business disruption.
• Focusing only on user accounts and forgetting to audit service principals assigned to custom owner roles.
• Believing that a NotActions property provides adequate security when combined with a wildcard.
• Failing to implement preventative guardrails, leading to the same problem reappearing after a manual cleanup.

Conclusion

Eliminating custom owner roles in Azure is a fundamental step toward achieving a mature cloud governance posture. These roles represent a significant security flaw and a source of financial risk, creating blind spots that are easily exploited. By prioritizing the use of standard, built-in roles and enforcing the Principle of Least Privilege, you can build a more secure, compliant, and cost-effective Azure environment.

The next step is to move from reactive cleanup to proactive prevention. Use automated guardrails and just-in-time access controls to ensure that overly permissive roles are never created in the first place. This approach establishes a sustainable security framework that scales with your organization.