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alibabacloud

A log monitoring and alert is set up for VPC network route changes

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

Alibaba Cloud SLS should have an alarm configured for VPC network route changes. By directing ActionTrail logs to SLS with alert rules, route table modifications are monitored in real time. This ensures creation, deletion, or modification of route entries is detected, verifying VPC traffic flows through expected paths.

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Risk

Without monitoring for route table changes, unauthorized route modifications may go undetected, allowing attackers to redirect traffic through malicious intermediaries. This increases risk of man-in-the-middle attacks, data exfiltration, and service disruption as traffic is diverted from intended destinations, compromising confidentiality and integrity.

Run this check with Prowler

Run in Prowler Cloud
Run
prowler alibabacloud --checks sls_vpc_network_route_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 VPC network route changes

Remediation

CLI

aliyun sls create-alert --project <project-name> --alert-name vpc-route-changes --alert-displayname 'VPC Network Route Changes Alert' --condition 'event.serviceName: Vpc and (event.eventName: CreateRouteEntry or event.eventName: DeleteRouteEntry or event.eventName: ModifyRouteEntry)' --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 VPC network route changes: `event.serviceName: Vpc and (event.eventName: CreateRouteEntry or event.eventName: DeleteRouteEntry or event.eventName: ModifyRouteEntry)`.
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_vpc_network_route_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 ("Ecs" in query or "Vpc" in query) and (
                    "CreateRouteEntry" in query
                    or "DeleteRouteEntry" in query
                    or "ModifyRouteEntry" in query
                    or "AssociateRouteTable" in query
                    or "UnassociateRouteTable" 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 VPC network route 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 VPC network route 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