AWS System Manager GetParameters permission being implicitly denied

Question

I am trying to setup eksctl for eks but it throwing "Error: unable to determine AMI to use: error getting AMI from SSM Parameter Store: AccessDeniedException: User: arn:aws:iam:::user/cnc is not authorized to perform: ssm:GetParameter on resource: arn:aws:ssm:us-east-1::parameter/aws/service/eks/optimized-ami/1.18/amazon-linux-2/recommended/image_id".

The IAM Permission Policy I am using is

    "Version": "2012-10-17",
    "Statement": [
        {
            "Effect": "Allow",
            "Action": [
                "ssm:DescribeParameters"
            ],
            "Resource": "*"
        },
        {
            "Effect": "Allow",
            "Action": [
                "ssm:GetParameters",
                "ssm:GetParametersByPath"
            ],
            "Resource": "arn:aws:ssm:::parameter/*"
        }
    ]

I also tried using policy simulation for check the permissions , it is giving me "Implicitly Denied (No matching statement)"

Answer 1

I had the same issue. The way I resolved it was by adding the region to the ssm resource. And also added a ssm:GetParameter like this:

"Version": "2012-10-17",
"Statement": [
    {
        "Effect": "Allow",
        "Action":[
            "ssm:DescribeParameters"
        ],
        "Resource": "*"
    },
    {
        "Effect": "Allow",
        "Action":[
            "ssm:GetParameters",
            "ssm:GetParameter",
            "ssm:GetParametersByPath"
        ],
        "Resource": "arn:aws:ssm:ca-central-1::parameter/*"
    }
]

If you notice I've added the region ca-central-1 and you should change it to your current region.