Original analysis sourced from Forbes.com (Louis Columbus, 2019). AWS Identity and Access Management (IAM) centralizes identity roles, policies, and Config Rules, yet does not go far enough to provide the Zero Trust-based Privileged Access Management (PAM) that enterprises need — especially those operating in hybrid or multi-cloud environments.
What AWS IAM Actually Provides
AWS includes a baseline level of IAM support at no additional charge as part of its cloud offering. The same is true of Microsoft Azure and Google Cloud. These native IAM capabilities are designed to give customers the essentials they need to control access within their respective environments. In practice, this means:
- Centralized management of identity roles and policies
- Config Rules that can trigger alerts via AWS Lambda
- API-level integration with HR systems and corporate directories
- Automatic suspension of users who violate access privileges
For organizations running workloads exclusively within a single cloud provider’s ecosystem, these built-in tools are often sufficient to get started. The problem emerges at scale, and particularly in hybrid or multi-cloud architectures, where native IAM tools frequently lack the depth and cross-environment reach that enterprise security teams require.
The Shared Responsibility Model and Its Implications for PAM
A fundamental concept underpinning cloud security on AWS — and other major providers — is the Shared Responsibility Model. Under this model:
- AWS is responsible for the security of the cloud: physical infrastructure, hardware, software, networking, and facilities.
- Customers are responsible for security in the cloud: operating systems, platforms, application configurations, data, and — critically — privileged access credentials.
This distinction matters enormously for privileged access. When a privileged credential is compromised inside a customer’s AWS environment, that is the customer’s problem to detect, respond to, and remediate. AWS’s infrastructure-level protections do not extend to how a customer’s administrators, service accounts, and automated processes use or misuse privileged credentials within their own instances.
For more detail, see the official AWS Shared Responsibility Model documentation at aws.amazon.com/compliance/shared-responsibility-model/.
Why Privileged Credentials Are the Core Risk
Privileged credential abuse is consistently cited by security researchers as one of the leading causes of data breaches. Forrester Research has estimated that the majority of data breaches involve compromised privileged credentials. A survey by Centrify (now Delinea) found that a significant proportion of breaches involved privileged access abuse specifically.
In cloud environments, privileged credentials take many forms beyond traditional username/password pairs: IAM roles, access keys, API tokens, SSH key pairs for EC2 instances, and service account credentials embedded in CI/CD pipelines. Each of these represents a potential entry point if not properly managed and monitored.
Four Truths About Privileged Access Security on AWS and Public Clouds
1. Cloud Providers Cannot Fully Protect Your Cloud Instances
The Shared Responsibility Model is often misunderstood — particularly by teams new to cloud. AWS secures the underlying infrastructure, but customers are entirely responsible for securing access to their own workloads, data, and privileged credentials. Relying solely on a cloud provider’s native security controls is not a complete security strategy.
Organizations should treat native IAM as a starting point, not a destination. A Zero Trust security framework — built on the principle of “never trust, always verify, enforce least privilege” — is the appropriate long-term goal for enterprise cloud security. AWS’s IAM is a useful interim tool, but it does not by itself constitute a Zero Trust architecture.
2. Migrating to the Cloud Does Not Require a New PAM Model
A common misconception pushed by some cloud integrators is that adopting AWS or another public cloud platform requires a completely new Privileged Access Security model. This is not accurate. The same PAM framework used for on-premises systems can — and should — be extended to cover IaaS implementations in the cloud.
AWS itself has acknowledged that conventional security and compliance concepts still apply in cloud environments. Organizations that have already invested in PAM tooling and processes for their data centers can typically extend those capabilities to their cloud workloads, rather than starting from scratch with cloud-native-only tools.
3. Hybrid Cloud Environments Do Not Need a Separate Identity Infrastructure
Creating duplicate identity stores for cloud environments increases cost, operational overhead, and security risk. Duplicate identities mean more credentials to manage, more opportunities for inconsistency, and more potential attack surface.
Existing directory services — such as Microsoft Active Directory or LDAP-based directories — can be extended into hybrid cloud architectures using a variety of approaches, including federation, directory synchronization, and directory brokering. Some PAM vendors offer multi-directory brokering capabilities that allow a single preferred directory to authenticate users consistently across on-premises systems, AWS, Azure, and Google Cloud environments.
AWS’s own security best practices recommend incorporating Active Directory or LDAP into multi-cloud and hybrid security architectures, rather than relying exclusively on IAM key pairs for services like Amazon EC2.
4. Existing PAM Systems Can Scale to Multi-Cloud Environments
System integrators specializing in cloud security sometimes oversell cloud-native IAM and PAM capabilities, arguing that a hybrid or multi-cloud strategy requires entirely separate systems for each environment. In most cases this is unnecessary and counterproductive.
Well-architected PAM solutions designed for enterprise on-premises use are generally capable of extending to hybrid cloud platforms — including AWS, Google Cloud, and Microsoft Azure — without requiring organizations to abandon their existing security model. When evaluating integrators and security vendors, look for those who demonstrate how a unified PAM approach can span both on-premises and cloud workloads.
Building a Zero Trust Roadmap for Hybrid and Multi-Cloud
The IAM capabilities built into AWS, Azure, and Google Cloud are best understood as stop-gap measures — useful foundations that must be supplemented with a broader, holistic identity and access management strategy. Organizations that treat each cloud environment as a security silo will find that managing access across a growing estate becomes increasingly complex, costly, and risky.
A practical Zero Trust roadmap for privileged access in hybrid cloud environments should include:
- Least-privilege enforcement: Grant only the permissions required for a specific task, and expire or revoke them when no longer needed.
- Just-in-time access: Provision elevated access on demand rather than maintaining standing privileged accounts.
- Multi-factor authentication (MFA): Require MFA for all privileged access, including programmatic and service account access where technically feasible.
- Session monitoring and recording: Record privileged sessions for audit and forensic purposes.
- Unified identity governance: Manage identities and access policies from a single control plane that spans on-premises and cloud environments.
- Regular access reviews: Periodically audit who has access to what, and remove unnecessary entitlements.
Privileged credentials — often called the “keys to the kingdom” — represent the highest-value target for attackers in any environment. In cloud environments, a compromised IAM access key or misconfigured role can grant an attacker broad, immediate access to sensitive workloads and data. Protecting these credentials with the same rigor applied to on-premises privileged accounts is not optional; it is a fundamental requirement for any serious cloud security posture.
Key Takeaways
- Native IAM from AWS, Azure, and Google Cloud provides a useful baseline but is not sufficient for enterprise-grade PAM, especially in hybrid or multi-cloud environments.
- The AWS Shared Responsibility Model places the security of privileged access credentials firmly in the customer’s hands.
- Migrating to the cloud does not require a new PAM model — existing frameworks can and should be extended to cover cloud workloads.
- Duplicate identity infrastructure increases risk and cost; existing directories can be extended into cloud environments.
- A Zero Trust approach — never trust, always verify, enforce least privilege — is the appropriate long-term security goal for any organization operating at cloud scale.