IAM role policy passrole allows all

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Metadata

Id: terraform-aws-iam-role-policy-passrole-allows-all

Provider: AWS

Platform: Terraform

Severity: Medium

Category: Access Control

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Description

Granting the iam:passrole action with a resource value of "*" in Terraform ("Resource": "*") is overly permissive, as it allows the user or role to pass any IAM role in the account to AWS services. This broad permission can lead to privilege escalation, enabling attackers or unauthorized users to assume highly-privileged roles they should not have access to. To mitigate this risk, the resource should be scoped to specific role ARNs (for example, "Resource": "arn:aws:iam::account-id:role/RoleName") to enforce the principle of least privilege.

Compliant Code Examples

resource "aws_iam_role_policy" "test_policy" {
  name = "test_policy"
  role = aws_iam_role.test_role.id

  policy = <<-EOF
  {
    "Version": "2012-10-17",
    "Statement": [
      {
        "Action": [
          "iam:passrole"
        ],
        "Effect": "Allow",
        "Resource": "arn:aws:sqs:us-east-2:account-ID-without-hyphens:queue1"
      }
    ]
  }
  EOF
}

Non-Compliant Code Examples

resource "aws_iam_role_policy" "test_policy" {
  name = "test_policy"
  role = aws_iam_role.test_role.id

  policy = <<-EOF
  {
    "Version": "2012-10-17",
    "Statement": [
      {
        "Action": [
          "iam:passrole"
        ],
        "Effect": "Allow",
        "Resource": "*"
      }
    ]
  }
  EOF
}

resource "aws_iam_role_policy" "multi_statement" {
  name = "multi_statement"
  role = aws_iam_role.test_role.id

  policy = <<-EOF
  {
    "Version": "2012-10-17",
    "Statement": [
      {
        "Sid": "Safe",
        "Effect": "Allow",
        "Action": "iam:passrole",
        "Resource": "arn:aws:iam::123456789012:role/example-role"
      },
      {
        "Sid": "Vulnerable",
        "Effect": "Allow",
        "Action": "iam:passrole",
        "Resource": "*"
      }
    ]
  }
  EOF
}

resource "aws_iam_role_policy" "jsonencoded" {
  name = "jsonencoded"
  role = aws_iam_role.test_role.id

  policy = jsonencode({
    Version = "2012-10-17"
    Statement = [
      {
        Sid      = "JsonEncodedVulnerable"
        Effect   = "Allow"
        Action   = "iam:passrole"
        Resource = "*"
      }
    ]
  })
}