Emerging AWS Misconfigurations – Bucket Name Squatting & Cross‑Service Confused Deputy Expose Enterprises

Emerging AWS Misconfigurations – Bucket Name Squatting & Cross‑Service Confused Deputy Expose Enterprises

What Happened — Vectra AI’s public‑cloud researcher demonstrated two advanced AWS misconfigurations: (1) bucket‑name squatting, where attackers pre‑register S3 bucket names a victim is likely to use, and (2) a cross‑service “confused deputy” flaw that lets an attacker in a different account hijack services such as CloudTrail when resource policies lack explicit account scoping.

Why It Matters for TPRM —

• These techniques bypass traditional visibility checks, creating silent pathways for data exfiltration or unauthorized compute.
• Existing third‑party cloud controls often assume bucket‑level permissions are sufficient, leaving a blind spot.
• The risk extends to any organization that outsources workloads to AWS, amplifying supply‑chain exposure.

Who Is Affected — Cloud‑native enterprises, SaaS providers, MSPs, and any third‑party that relies on AWS S3, CloudTrail, or related services.

Recommended Actions —

• Audit S3 bucket naming conventions and enable the AWS feature that ties bucket names to account IDs/regions.
• Review all resource policies that trust AWS services; add aws:SourceAccount or aws:PrincipalOrgID condition keys.
• Incorporate misconfiguration detection rules into continuous CSPM tooling and third‑party risk assessments.

Technical Notes —

• Attack Vector: Misconfiguration (bucket name squatting, confused deputy).
• Fixes: Enable bucket‑name‑to‑account binding; tighten IAM/resource policies with explicit source conditions.
• Data Types at Risk: Stored objects, logs, code artifacts, and any data accessed via compromised services.

Source: Help Net Security – Cloud misconfiguration has evolved and your controls haven’t