ALAS-2017-895

The default umask value is set to 022 to address a privilege escalation security vulnerability.

1. Run yum update aws-cfn-bootstrap to update your system.
2. Update the AWS::CloudFormation::Init metadata section of your template, specifically the entries listed under the files key, to explicitly specify the mode field as documented at http://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/aws-resource-init.html . We recommend setting the mode to explicitly disable permissions for non-owners. Alternatively, you can also choose to explicitly change the mode of the files listed in your template, by directly logging on to the instance.
3. Restart the cfn-hup process: service cfn-hup restart

noarch:
    aws-cfn-bootstrap-1.4-22.14.amzn1.noarch

src:
    aws-cfn-bootstrap-1.4-22.14.amzn1.src