Use this IAM policy to list zones and update DNS records.
{
"Version": "2012-10-17",
"Statement": [
{
"Effect": "Allow",
"Action": [
"route53:ChangeResourceRecordSets"
],
"Resource": [
"arn:aws:route53:::hostedzone/*"
]
},
{
"Effect": "Allow",
"Action": [
"route53:ListHostedZones",
"route53:ListHostedZonesByName",
"route53:ListResourceRecordSets"
],
"Resource": [
"*"
]
}
]
}