AWS ECR Repository or Registry Policy Granted Public Access

Description

Detects when an Amazon ECR repository or registry policy is modified to grant public access using a wildcard principal (Principal:"*") statement. This rule analyzes SetRepositoryPolicy and PutRegistryPolicy events whose policy document grants an Allow effect to a wildcard ("*") principal, indicating that pull (and potentially push) permissions were extended to all identities, including unauthenticated users. A public container registry can expose proprietary images and any secrets baked into their layers, and, if push is allowed, enables supply-chain implantation. Public ECR access is sometimes intentional for image distribution, so the granting principal and the permissions should be validated.

Detection logic

Its licence does not clear it for publishing here

Sunturai publishes a detection's own text where the licence it arrived under has been reviewed and permits it, and Elastic License 2.0 has not. The query as its source wrote it, its canonical form and the hash that pins this revision are in the workspace record.

Detection requirements

Platform: IaaS Office Suite SaaS
The rule states no platform. This is derived from the ATT&CK technique it maps to.

Known benign triggers

Repositories used to distribute public images may legitimately contain Principal:"*". This rule does not by itself determine whether a Deny statement restricts the same access; review the full policy in "aws.cloudtrail.request_parameters" and confirm the granted actions (pull-only versus push) and whether public exposure is intended.

References

Links the source published beside this detection. Reference is the link the source wrote, unmodified. Class is decided by this catalogue from the host and path, not stated by the source. Cited by counts published detections citing the same resource, including this one, and the sources beneath it count the repositories this catalogue ingests, which is not the same as independent research.
Reference	Class	Cited by
docs.aws.amazon.com/AmazonECR/latest/APIReference/API_SetRepositoryPolicy.html	Product documentation	Only this detection cites it
docs.aws.amazon.com/AmazonECR/latest/userguide/repository-policies.html	Product documentation	Only this detection cites it

Detection rules

AWS ECR Repository or Registry Policy Granted Public Access

Description

Detection logic

Detection requirements

Known benign triggers

MITRE ATT&CK mappings

References

From the source

Licence

Authorship

Detection rules