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alibabacloud

Log monitoring and alerts are set up for OSS permission changes

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

Alibaba Cloud SLS should have an alarm configured for OSS Bucket RAM permission changes. By directing ActionTrail logs to SLS with alert rules, OSS permission modifications are monitored in real time. This ensures changes to bucket access controls and RAM policies affecting OSS are promptly detected.

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Risk

Without monitoring for OSS permission changes, unauthorized modifications to bucket access controls may go undetected, allowing attackers unauthorized access to sensitive objects. Delayed detection increases risk of data exfiltration, data tampering, and compliance violations, compromising confidentiality and integrity of stored data.

Run this check with Prowler

Run in Prowler Cloud
Run
prowler alibabacloud --checks sls_oss_permission_changes_alert_enabled

Recommendation

  1. Log on to the SLS Console
  2. Ensure OSS logging is enabled
  3. Select Alerts
  4. Ensure alert rule has been enabled for OSS permission changes

Remediation

CLI

aliyun sls create-alert --project <project-name> --alert-name oss-permission-changes --alert-displayname 'OSS Permission Changes Alert' --condition 'event.serviceName: Oss and (event.eventName: PutBucketAcl or event.eventName: PutObjectAcl)' --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 OSS permission changes: `event.serviceName: Oss and (event.eventName: PutBucketAcl or event.eventName: PutObjectAcl)`.
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_oss_permission_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 ("PutBucket" in query and "acl" in query) or (
                    "PutObjectAcl" 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 OSS permission 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 OSS permission 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