Background
A cloud-native SaaS provider hosting its core applications and customer data on AWS had embraced automation through extensive use of Identity and Access Management (IAM) roles. These roles were used to facilitate deployment processes, grant temporary access, and support various internal services.
However, with rapid scaling and team expansion, the organization suspected that certain IAM configurations may have been left overly permissive — creating potential backdoors for privilege escalation.
To assess and address these concerns, the company engaged CyberSapiens for a comprehensive AWS penetration test focused on IAM security.
The Challenge
While IAM roles were widely implemented to control access, the lack of centralized oversight and accumulated legacy policies posed a risk. Specifically, the concern was that some roles might have granted more permissions than necessary — or worse, administrator-level access — without being actively monitored.
Complicating matters, developers occasionally stored IAM credentials on cloud instances for convenience, potentially exposing access to anyone who compromised those systems.
Approach & Key Findings
During the assessment, CyberSapiens identified that credentials stored on a cloud instance allowed access to an IAM role assigned to developers. Upon reviewing its policy, we found that this role had virtually unrestricted permissions across the AWS environment — a significant violation of least privilege principles.
With such access, an attacker could:
- Modify or delete IAM users and roles.
- Access sensitive customer data from databases and storage services.
- Launch, terminate, or alter production workloads.
- Potentially bypass security controls or deploy persistence mechanisms.
This misconfiguration represented a critical privilege escalation path, with the potential to cause widespread damage if exploited by a malicious actor.
Remediation & Risk Mitigation
Working closely with the client, CyberSapiens guided the team through the following remediation steps:
- Policy Refinement: Overly permissive policies were rewritten to align with the principle of least privilege, allowing only the actions necessary for each role’s purpose.
- Access Hygiene: IAM credentials were removed from cloud instances and centralized access mechanisms were enforced.
- Monitoring & Alerts: CloudTrail was configured to log all IAM role assumptions, and alerts were set up for any high-risk activity.
- Continuous Analysis: AWS IAM Access Analyzer was deployed to flag overly broad permissions and cross-account access issues in real time.
- Multi-Factor Authentication (MFA): MFA was enforced across all privileged IAM accounts and roles.
Outcome
Following the engagement, the client significantly improved its IAM security posture:
- A high-risk privilege escalation vector was eliminated.
- Cloud access was streamlined and secured with proper governance.
- Proactive monitoring and audit controls were put in place to detect misconfigurations early.
- The organization now conducts quarterly reviews of IAM roles to ensure alignment with security best practices.
Key Takeaways
- Over-permissive IAM roles are one of the most overlooked cloud security risks — often introduced with good intentions but rarely reviewed.
- Regular audits, centralized credential management, and role-specific policies are critical to preventing unauthorized access.
- Cloud-native companies must adopt a least privilege mindset and enforce security guardrails to stay ahead of evolving threats.
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