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Enable Disk Encryption Monitoring

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Risk level: Medium (should be achieved)
Rule ID: SecurityCenter-006

Ensure that disk encryption monitoring is enabled within your Microsoft Azure cloud account so that Azure Security Center service can detect if your virtual machines (Windows and Linux) have disk encryption enabled.

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

Security

When working with production data it is highly recommended to implement encryption in order to protect it from unauthorized access and fulfill compliance requirements for data-at-rest encryption in your organization. Azure Security Center disk encryption monitoring identifies non-compliant virtual machines (VMs) and recommends enabling disk encryption for these VMs in order to enhance data protection.

Audit

To determine if "Monitor Disk Encryption" feature is enabled within Azure Security Center, perform the following actions

Using Azure Console

01 Sign in to Azure Management Console.

02 Navigate to Azure Security Center blade at https://portal.azure.com/#blade/Microsoft_Azure_Security/SecurityMenuBlade/.

03 In the navigation panel, choose Security policy to access Policy Management portal.

04 On the Policy Management page, click on the name of the subscription that you want to examine to access the selected subscription configuration settings.

05 On the Security Policy page, in the Compute and Apps category, check the Disk encryption should be applied on virtual machines setting status. If the configuration setting is set to Disabled, the disk encryption monitoring is not enabled for the Microsoft Azure virtual machines (VMs) provisioned in the current subscription.

06 Repeat step no. 4 and 5 for each Microsoft Azure subscription available in your account.

Using Azure CLI and PowerShell

01 Run account get-access-token command (Windows/macOS/Linux) using custom query filters to get the "Monitor Disk Encryption" feature status for the current Azure account subscription:

az account get-access-token
	--query "{subscription:subscription,accessToken:accessToken}"
	--out tsv | xargs -L1 bash -c 'curl -X GET -H "Authorization: Bearer $1" -H "Content-Type: application/json" https://management.azure.com/subscriptions/$0/providers/Microsoft.Authorization/policyAssignments/SecurityCenterBuiltIn?api-version=2018-05-01' | jq 'select(.name=="SecurityCenterBuiltIn")'|jq '.properties.parameters.diskEncryptionMonitoringEffect.value'

02 The command output should return the disk encryption monitoring configuration status:

"Disabled"

If the command output returns "Disabled", as shown in the example above, the disk encryption monitoring is not enabled for the Microsoft Azure virtual machines (Windows and Linux) available in the selected subscription.

03 Repeat step no. 1 and 2 for each Microsoft Azure subscription available in your account.

Remediation / Resolution

To enable disk encryption monitoring and recommendations for your Microsoft Azure virtual machines (VMs), perform the following actions:

Using Azure Console

01 Sign in to Azure Management Console.

02 Navigate to Azure Security Center blade at https://portal.azure.com/#blade/Microsoft_Azure_Security/SecurityMenuBlade/.

03 In the navigation panel, choose Security policy to access Policy Management portal.

04 On the Policy Management page, click on the name of the subscription that you want to reconfigure to access the selected subscription configuration settings.

05 On the Security Policy page, click on the ASC Default (subscription: abcdabcd-1234-1234-1234-abcdabcdabcd) policy assignment to edit the policy configuration.

06 On the selected policy assignment page, in the PARAMETERS section, select AuditIfNotExists from Monitor disk encryption dropdown list to enable disk encryption monitoring for all the Microsoft Azure virtual machines available in the selected Azure subscription.

07 Click Save to apply the changes. If successful, the following message should be displayed: "Updating policy assignment succeeded". Once the configuration changes are saved, the Security Center disk encryption monitoring feature becomes active for the selected Azure subscription.

08 If required, repeat steps no. 4 – 7 for other Microsoft Azure cloud subscription available.

Using Azure CLI and PowerShell

01 Define the required parameters for the account get-access-token command, where the diskEncryptionMonitoringEffect configuration parameter is enabled. Save the following content to a JSON file named enable-disk-encryption-monitoring.json and replace the highlighted details, i.e. <azure-subscription-id> and <policy-definition-id>, with your own Azure account details:

{
   "properties":{
      "displayName":"ASC Default (subscription: <azure-subscription-id>)",
      "policyDefinitionId":"/providers/Microsoft.Authorization/policySetDefinitions/<policy-definition-id>",
      "scope":"/subscriptions/<azure-subscription-id>",
      "parameters":{
         "diskEncryptionMonitoringEffect":{
            "value":"AuditIfNotExists"
         }
      }
   },
   "id":"/subscriptions/<azure-subscription-id>/providers/Microsoft.Authorization/policyAssignments/SecurityCenterBuiltIn",
   "type":"Microsoft.Authorization/policyAssignments",
   "name":"SecurityCenterBuiltIn",
   "location":"eastus"
}

02 Run account get-access-token command (Windows/macOS/Linux) using the parameters defined at the previous step (i.e. enable-disk-encryption-monitoring.json file) to enable the disk encryption monitoring and recommendations for the selected Microsoft Azure cloud subscription (the command request does not produce an output):

az account get-access-token
	--query "{subscription:subscription,accessToken:accessToken}"
	--out tsv | xargs -L1 bash -c 'curl -X PUT -H "Authorization: Bearer $1" -H "Content-Type: application/json" https://management.azure.com/subscriptions/$0/providers/Microsoft.Authorization/policyAssignments/SecurityCenterBuiltIn?api-version=2018-05-01 -d@"enable-disk-encryption-monitoring.json"'

03 If successful, the command output should return the updated Azure Security Center policy:

{
   "sku":{
      "name":"A0",
      "tier":"Free"
   },
   "properties":{
      "displayName":"ASC Default (subscription: abcdabcd-1234-1234-1234-abcdabcdabcd)",
      "scope":"/subscriptions/abcdabcd-1234-1234-1234-abcdabcdabcd",

      ...

      "description":"This is the default set of policies monitored by Azure Security Center. It was automatically assigned as part of on-boarding to Security Center. The default assignment contains only audit policies. For more information please visit https://aka.ms/ascpolicies",
   },
   "id":"/subscriptions/abcdabcd-1234-1234-1234-abcdabcdabcd/providers/Microsoft.Authorization/policyAssignments/SecurityCenterBuiltIn",
   "type":"Microsoft.Authorization/policyAssignments",
   "name":"SecurityCenterBuiltIn",
   "location":"eastus"
}

04 If required, repeat steps no. 1 – 3 for other Microsoft Azure cloud subscription available.

References

Publication date May 21, 2019

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You are auditing:

Enable Disk Encryption Monitoring

Risk level: Medium