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Knowledge Base Best practice rules for Amazon Web Services AWS Certificate Manager Best Practices ACM Certificate Expired
Last updated: 02 June 2017
Security
Operational
excellence
Risk level: High (not acceptable risk)
Rule ID: ACM-001

Ensure that all the expired Secure Sockets Layer/Transport Layer Security (SSL/TLS) certificates managed by AWS Certificate Manager are removed in order to adhere to Amazon Security Best Practices. Certificate Manager is the AWS service that lets you easily provision, manage, and deploy SSL/TLS certificates for use with other Amazon services such as Elastic Load Balancing and CloudFront.

This rule can help you with the following compliance standards:

This rule can help you work with the AWS Well-Architected Framework

This rule resolution is part of the Cloud Conformity Security & Compliance tool for AWS

Removing expired AWS ACM certificates eliminates the risk that an invalid SSL/TLS certificate will be deployed accidentally to another resource such as Elastic Load Balancing (ELB), action that can trigger front-end errors and damage the credibility of the web application/website behind the ELB.

Audit

To determine if there are any expired SSL/TLS certificates managed by AWS Certificate Manager, perform the following :

Using AWS Console

01 Sign in to the AWS Management Console.

02 Navigate to AWS ACM dashboard at https://console.aws.amazon.com/acm/.

03 Click on the Show/Hide Columns button from the dashboard top-right menu:

Show/Hide Columns button

04 Within the Shown Columns dialog box, under Properties, select Status checkbox then click X to return to the ACM dashboard.

05 Select the SSL/TLS certificate that you want to examine and verify its current status value available under the Status column. If the current status is set to Expired, i.e.

If the current status is set to Expired

the selected certificate is not valid anymore and can be safely removed from your AWS account.

06 Repeat step no. 5 to check other SSL/TLS certificates managed by AWS ACM in the current region.

07 Change the AWS region from the navigation bar and repeat the audit process for other regions.

Using AWS CLI

01 Run list-certificates command (OSX/Linux/UNIX) using built-in query filters to list all the expired AWS ACM certificates available in the selected region: 

aws acm list-certificates
	--region us-east-1
	--certificate-statuses EXPIRED

02 The command output should return the metadata (domain name and ARN) for all expired SSL/TLS certificates managed by Amazon Certificate Manager within US East (N. Virginia) region or an empty array, i.e. [ ], if there are no expired certificates within the selected region: 

{
    "CertificateSummaryList": [
        {
            "CertificateArn": "arn:aws:acm:us-east-1:123456789012:
             certificate/c19aa6f6-d6bc-4747-9274-89daa8001231",
            "DomainName": "cloudconformity.com"
        },
        {
            "CertificateArn": "arn:aws:acm:us-east-1:123456789012:
             certificate/87654321-4321-4321-4321-210987654321",
            "DomainName": "cloudrealisation.com"
        }
    ]
}

If the command output returns one or more values for the CertificateSummaryList array, there are expired SSL/TLS within the selected AWS region.

03 Repeat step no. 1 and 2 to verify other SSL/TLS certificates managed by AWS ACM service within the current region.

04 Change the AWS region by updating the --region command parameter value and repeat the entire audit process for other regions.

Remediation / Resolution

To delete any expired SSL/TLS certificates managed by AWS Certificate Manager, perform the following:

Using AWS Console

01 Sign in to the AWS Management Console.

02 Navigate to AWS ACM dashboard at https://console.aws.amazon.com/acm/.

03 Select the SSL/TLS certificate that you want to remove (see Audit section part I to identify the right certificate).

04 Click the Actions button from the dashboard top menu and select Delete option from the dropdown menu.

05 Inside the Delete certificate dialog box, review the certificate details (domain name and ID) then click Delete to confirm the action.

06 Repeat steps no. 3 – 5 to remove other expired AWS ACM certificates available within the selected region.

07 Change the AWS region from the navigation bar and repeat the process for other regions.

Using AWS CLI

01Run delete-certificate command (OSX/Linux/UNIX) using the ARN of the resource as identifier (see Audit section part II to get the right ARN) to remove the selected expired AWS ACM certificate and the associated private key from your AWS account (the command does not return an output): 

aws acm delete-certificate
	--region us-east-1
	--certificate-arn arn:aws:acm:us-east-1:123456789012:certificate/c19aa6f6-d6bc-4747-9274-89daa8001231

02 Repeat step no. 1 to remove other expired AWS Certificate Manager certificates available in the selected region.

03 Change the AWS region by updating the --region command parameter value and repeat the entire process for other regions.

References

Publication date May 2, 2017

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