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alibabacloud

A log monitoring and alert is set up for disabling or deletion of customer created CMKs

sls_customer_created_cmk_changes_alert_enabled
Service: slsSeverity: medium
OfficialBuilt-inVerified
Categories:logging
Resource Type:ALIYUN::SLS::Alert

Alibaba Cloud SLS should have an alarm configured for customer-created KMS CMKs that are disabled or scheduled for deletion. By directing ActionTrail logs to SLS with alert rules, disabling or deletion of encryption keys is promptly detected, preventing accidental or malicious loss of access to encrypted data.

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Risk

Without monitoring for CMK state changes, data encrypted with disabled or deleted keys becomes permanently inaccessible, leading to data loss, business disruption, and compliance violations. Malicious actors could silently disable or schedule deletion of encryption keys, rendering data unrecoverable.

Run this check with Prowler

Run in Prowler Cloud
Run
prowler alibabacloud --checks sls_customer_created_cmk_changes_alert_enabled

Recommendation

  1. Log on to the SLS Console
  2. Ensure ActionTrail is enabled
  3. Select Alerts
  4. Ensure alert rule has been enabled for disabling or deletion of customer-created CMKs

Remediation

CLI

aliyun sls create-alert --project <project-name> --alert-name cmk-changes --alert-displayname 'CMK Changes Alert' --condition 'event.serviceName: Kms and (event.eventName: DisableKey or event.eventName: ScheduleKeyDeletion)' --dashboard <dashboard-name> --schedule '{"type":"FixedRate","interval":"1m"}'

Other

1Log on to the **SLS Console**.
2Ensure **ActionTrail** is enabled and delivering logs to a **Log Service** project.
3Navigate to the project receiving ActionTrail logs.
4Select **Alerts** and click **Create Alert Rule**.
5Configure the query to filter for CMK changes: `event.serviceName: Kms and (event.eventName: DisableKey or event.eventName: ScheduleKeyDeletion)`.
6Set the alert **schedule**, **notification method**, and **severity**.
7Save and enable the alert rule.

Check Code

from prowler.lib.check.models import Check, CheckReportAlibabaCloud
from prowler.providers.alibabacloud.services.sls.sls_client import sls_client


class sls_customer_created_cmk_changes_alert_enabled(Check):
    def execute(self) -> list[CheckReportAlibabaCloud]:
        findings = []
        found = False

        for alert in sls_client.alerts:
            query_list = alert.configuration.get("queryList", [])
            if not query_list:
                continue

            for query_obj in query_list:
                query = query_obj.get("query", "")
                if "Kms" in query and (
                    "DisableKey" in query
                    or "ScheduleKeyDeletion" in query
                    or "DeleteKeyMaterial" in query
                ):
                    found = True
                    report = CheckReportAlibabaCloud(
                        metadata=self.metadata(), resource=alert
                    )
                    report.status = "PASS"
                    report.status_extended = f"SLS Alert {alert.name} is configured for disabling or deletion of customer created CMKs."
                    report.resource_id = alert.name
                    report.resource_arn = alert.arn
                    report.region = alert.region
                    findings.append(report)
                    break

            if found:
                break

        if not found:
            report = CheckReportAlibabaCloud(
                metadata=self.metadata(), resource=sls_client.provider.identity
            )
            report.status = "FAIL"
            report.status_extended = "No SLS Alert configured for disabling or deletion of customer created CMKs."
            report.resource_id = sls_client.audited_account
            report.resource_arn = sls_client.provider.identity.identity_arn
            report.region = sls_client.region
            findings.append(report)

        return findings

References