AWS - ECR Unauthenticated Enum

ECR

For more information check:

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../../aws-services/aws-ecr-enum.md
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Public registry repositories (images)

As mentioned in the ECS Enum section, a public registry is accessible by anyone uses the format public.ecr.aws/<random>/<name>. If a public repository URL is located by an attacker he could download the image and search for sensitive information in the metadata and content of the image.

aws ecr describe-repositories --query 'repositories[?repositoryUriPublic == `true`].repositoryName' --output text

⚠️ Warning

This could also happen in **private registries** where a registry policy or a repository policy is **granting access for example to `"AWS": "*"`**. Anyone with an AWS account could access that repo.

Enumerate Private Repo

The tools skopeo and crane can be used to list accessible repositories inside a private registry.

# Get image names
skopeo list-tags docker://<PRIVATE_REGISTRY_URL> | grep -oP '(?<=^Name: ).+'
crane ls <PRIVATE_REGISTRY_URL> | sed 's/ .*//'