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alibabacloud

A log monitoring and alert is set up for unauthorized API calls

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

Alibaba Cloud SLS should have an alarm configured for unauthorized API calls. By directing ActionTrail logs to SLS with alert rules, API calls resulting in unauthorized errors are detected promptly, helping identify misconfigured applications, compromised credentials, or active attacker reconnaissance.

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Risk

Without monitoring for unauthorized API calls, failed access patterns may go undetected. These often indicate malicious activity such as permission probing or exploiting misconfigured access controls. Delayed detection increases risk of security breaches by delaying identification of compromised credentials and privilege escalation attempts.

Run this check with Prowler

Run in Prowler Cloud
Run
prowler alibabacloud --checks sls_unauthorized_api_calls_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 unauthorized API calls

Remediation

CLI

aliyun sls create-alert --project <project-name> --alert-name unauthorized-api-calls --alert-displayname 'Unauthorized API Calls Alert' --condition 'event.errorCode: Forbidden or event.errorCode: AccessDenied' --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 unauthorized API calls: `event.errorCode: Forbidden or event.errorCode: AccessDenied`.
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_unauthorized_api_calls_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 "ApiCall" in query and (
                    "NoPermission" in query
                    or "Forbidden" in query
                    or "Forbbiden" in query
                    or "InvalidAccessKeyId" in query
                    or "InvalidSecurityToken" in query
                    or "SignatureDoesNotMatch" in query
                    or "InvalidAuthorization" in query
                    or "AccessForbidden" in query
                    or "NotAuthorized" 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 unauthorized API calls."
                    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 unauthorized API calls."
            )
            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