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alibabacloud

Log monitoring and alerts are set up for Cloud Firewall changes

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

Alibaba Cloud SLS should have an alarm configured for Cloud Firewall rule changes. By directing ActionTrail logs to SLS with alert rules, real-time monitoring of firewall modifications is achieved. This ensures creation, update, or deletion of Cloud Firewall control policies is promptly detected and reviewed.

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Risk

Without monitoring for Cloud Firewall changes, unauthorized modifications to firewall rules may go undetected, leading to network exposure or blocked legitimate traffic. Failure to detect changes timely increases risk of data breaches, lateral movement, and service disruption.

Run this check with Prowler

Run in Prowler Cloud
Run
prowler alibabacloud --checks sls_cloud_firewall_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 Cloud Firewall changes

Remediation

CLI

aliyun sls create-alert --project <project-name> --alert-name cloud-firewall-changes --alert-displayname 'Cloud Firewall Changes Alert' --condition 'event.serviceName: CloudFirewall and (event.eventName: CreateControlPolicy or event.eventName: ModifyControlPolicy or event.eventName: DeleteControlPolicy)' --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 Cloud Firewall changes: `event.serviceName: CloudFirewall and (event.eventName: CreateControlPolicy or event.eventName: ModifyControlPolicy or event.eventName: DeleteControlPolicy)`.
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_cloud_firewall_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 "Cloudfw" in query and (
                    "CreateVpcFirewallControlPolicy" in query
                    or "DeleteVpcFirewallControlPolicy" in query
                    or "ModifyVpcFirewallControlPolicy" 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 Cloud Firewall changes."
                    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 Cloud Firewall changes."
            )
            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