ECR repository is publicly accessible

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Metadata

Id: terraform-aws-ecr-repository-is-publicly-accessible

Provider: AWS

Platform: Terraform

Severity: Critical

Category: Access Control

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Description

Amazon ECR repository policies that use a wildcard * in the Principal field grant public access to your container images, potentially exposing sensitive data or proprietary code. When left unaddressed, this vulnerability allows unauthorized users to pull, and in some cases push, container images, compromising the integrity and confidentiality of your container deployments. To remediate this issue, always specify explicit IAM principals in your repository policies, such as "Principal": { "AWS": "arn:aws:iam::account_number:root" } instead of using "Principal": "*".

Compliant Code Examples

resource "aws_ecr_repository" "negative1" {
  name = "bar"
}

resource "aws_ecr_repository_policy" "negative2" {
  repository = aws_ecr_repository.foo.name

  policy = <<EOF
{
    "Version": "2008-10-17",
    "Statement": [
        {
            "Sid": "new policy",
            "Effect": "Allow",
            "Principal": {
                "AWS": "arn:aws:iam::##account_number##:root"
            },
            "Action": [
                "ecr:GetDownloadUrlForLayer",
                "ecr:BatchGetImage",
                "ecr:BatchCheckLayerAvailability",
                "ecr:PutImage",
                "ecr:InitiateLayerUpload",
                "ecr:UploadLayerPart",
                "ecr:CompleteLayerUpload",
                "ecr:DescribeRepositories",
                "ecr:GetRepositoryPolicy",
                "ecr:ListImages",
                "ecr:DeleteRepository",
                "ecr:BatchDeleteImage",
                "ecr:SetRepositoryPolicy",
                "ecr:DeleteRepositoryPolicy"
            ]
        }
    ]
}
EOF
}

Non-Compliant Code Examples

resource "aws_ecr_repository" "positive1" {
  name = "bar"
}

resource "aws_ecr_repository_policy" "positive2" {
  repository = aws_ecr_repository.foo.name

  policy = <<EOF
{
    "Version": "2008-10-17",
    "Statement": [
        {
            "Sid": "new policy",
            "Effect": "Allow",
            "Principal": "*",
            "Action": [
                "ecr:GetDownloadUrlForLayer",
                "ecr:BatchGetImage",
                "ecr:BatchCheckLayerAvailability",
                "ecr:PutImage",
                "ecr:InitiateLayerUpload",
                "ecr:UploadLayerPart",
                "ecr:CompleteLayerUpload",
                "ecr:DescribeRepositories",
                "ecr:GetRepositoryPolicy",
                "ecr:ListImages",
                "ecr:DeleteRepository",
                "ecr:BatchDeleteImage",
                "ecr:SetRepositoryPolicy",
                "ecr:DeleteRepositoryPolicy"
            ]
        }
    ]
}
EOF
}

resource "aws_ecr_repository" "multi" {
  name = "multi-statement-repo"
}

resource "aws_ecr_repository_policy" "multi" {
  repository = aws_ecr_repository.multi.name

  policy = <<EOF
{
  "Version": "2008-10-17",
  "Statement": [
    {
      "Sid": "AllowSpecific",
      "Effect": "Allow",
      "Principal": {
        "AWS": "arn:aws:iam::123456789012:root"
      },
      "Action": [
        "ecr:GetDownloadUrlForLayer",
        "ecr:BatchGetImage"
      ]
    },
    {
      "Sid": "AllowAnyone",
      "Effect": "Allow",
      "Principal": "*",
      "Action": [
        "ecr:GetDownloadUrlForLayer",
        "ecr:BatchGetImage"
      ]
    }
  ]
}
EOF
}

resource "aws_ecr_repository" "aws_wildcard" {
  name = "aws-wildcard-repo"
}

resource "aws_ecr_repository_policy" "aws_wildcard" {
  repository = aws_ecr_repository.aws_wildcard.name

  policy = <<EOF
{
  "Version": "2008-10-17",
  "Statement": [
    {
      "Sid": "AllowAnyAccount",
      "Effect": "Allow",
      "Principal": {
        "AWS": "*"
      },
      "Action": [
        "ecr:GetDownloadUrlForLayer",
        "ecr:BatchGetImage"
      ]
    }
  ]
}
EOF
}