# AWS - ECR Unauthenticated Enum

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## ECR

For more information check:

{{#ref}}
../../aws-services/aws-ecr-enum.md
{{#endref}}

### 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.

```bash
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**](https://github.com/containers/skopeo) and [**crane**](https://github.com/google/go-containerregistry/blob/main/cmd/crane/doc/crane.md) can be used to list accessible repositories inside a private registry.

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

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