ECR registry with mutable tags can lead to code injection

Severity	Exploitability	Providers	Categories
HIGH	HIGH	AWS	OTHER

Description

Amazon Elastic Container Registry (Amazon ECR) is an AWS managed container image registry service.

Images in the registry can be referenced with tags. When a repository has mutable tags, an attacker with access to the registry could upload a compromised image, and assign to it the tag of an image used in production, so that the compromised image would be used instead.

Impact

Potential data exposure	Visible in logs	User interaction required	Privileges required
True	True	False	True

Code injection.

Remediation guidelines

Disable tag mutability on the registry.

References

• AWS ECR tag mutability

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