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CTHFM: AWS
  • Welcome
  • Getting Started
    • Account Setup
  • AWS CLI
    • AWS CLI Overview
    • Installation
  • AWS Fundamentals
    • AWS Documentation
    • AWS Shared Responsibility Model
    • Organizational Hierarchy
    • AWS Principals
    • IAM Fundamentals
      • IAM Policy Components
      • IAM Documentation References
    • AWS Security Services Overview
    • AWS Core Services
    • AWS Frameworks
    • Regions and Availability Zones
  • SQL
    • SQL Refresher for Threat Hunting
  • Logging Reference
    • Cloudtrail
      • What is Cloudtrail?
      • Setting Up Cloudtrail
      • Cloudtrail Events Structure
      • Filtering and Searching CloudTrail Logs
      • IAM ID Prefixes
      • Additional Resources
      • API References
    • VPCFlow Logs
    • GuardDuty
      • Multi-Account Setup
      • GuardDuty Concepts
      • GuardDuty Finding References
      • S3 Protection
      • Malware Protection
        • EC2 Malware Protection
          • EC2 Protection Resources
          • Monitoring Scans
          • EC2 Malware Protection Events: CloudWatch
        • S3 Malware Protection
          • Enabling S3 Malware Protection
          • After Enabling S3 Malware Protection
          • S3 Malware Resource Plan Status
          • S3 Malware Protection Quotas
      • RDS Protection Enablement
      • Lambda Protection Enablement
      • Trusted IP Lists and Threat Lists in Amazon GuardDuty
      • Remediation Recommendations
      • GuardDuty API Reference
      • GuardDuty Quotas
    • Access Analyzer
      • Setup
      • External Access and Unused Access Analyzer Findings
      • Review Findings
      • Access Analyzer Resources
      • Access Analyzer API Reference
    • AWS Network Firewall
      • Permissions
      • Firewall Log Contents
      • Logging Destinations
      • CloudWatch Firewall Metrics
    • AWS Config
      • Resource Management in AWS Config
      • AWS Config Integrations
      • AWS Config Resources
      • Configuration Item
      • Config Rules
        • Evaluation Modes
  • CloudWatch
    • Amazon CloudWatch
      • CloudWatch Concepts
      • CloudWatch Metrics
        • Filter Pattern Syntax
      • CloudWatch Alarms
        • Alarm Recommendations
      • Subscriptions
      • CloudWatch Agent
      • CloudWatch Insights
        • Supported Logs and Discovered Fields
        • CloudWatch Insights Query Syntax
      • Anomaly Detection
        • Create Anomaly Detector
        • Alarms for Anomaly Detections
      • CloudWatch Filter Syntax
      • CloudWatch Service Quota
  • Athena For Threat Hunting
    • Introduction to Athena
    • Setting Up Athena
    • SQL For Threat Hunters
    • Automated Response
    • Query Best Practices
  • AWS Security Research and Resources
    • AWS Security Blog
    • AWS Goat
    • Cloud Goat
    • Pacu
    • Prowler
    • Scout Suite
  • Threat Hunting in AWS
    • Threat Hunting in AWS
    • Threat Hunting Introduction
    • Threat Hunting Process
      • Hypothesis Generation
      • Investigation
      • Identification
      • Resolution & Follow Up
    • Pyramid of Pain
    • MITRE Att&ck
      • MITRE Att&ck Concepts
      • MITRE Att&CK Data Sources
      • MITRE Att&CK Mitigations
    • MITRE Att&ck: AWS
      • MITRE Att&CK Matrix
      • Amazon Web Services Security Control Mappings
    • AWS Threat Hunting Ideas
      • AWS Threat Hunting Ideas: EC2
      • AWS Threat Hunting Ideas: Lambda
      • AWS Threat Hunting Ideas: SQS
      • AWS Threat Hunting Ideas: SNS
      • AWS Threat Hunting Ideas: RDS
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  • Overview
  • External Access Findings:
  • Unused Access Findings:
  1. Logging Reference
  2. Access Analyzer

External Access and Unused Access Analyzer Findings

Overview

The following provides an explanation of both external access and unused access findings.

External Access Findings:

  • Purpose: Identifies when resource-based policies allow access to resources from outside your zone of trust.

  • How it Works:

    • Each modification to a resource-based policy triggers a new finding if permissions change.

    • Resolved Status: A finding is marked as Resolved when the external access is removed.

    • Finding Updates: Findings stay Active until manually archived or access is removed. Updates can take up to 30 minutes after a policy change.

  • Zelkova Analysis:

    • IAM policies are converted into logical statements, evaluated using Zelkova (a satisfiability modulo theories solver).

    • Findings indicate access allowed by policies, regardless of actual access by external entities.

    • Privacy Consideration: IAM Access Analyzer doesn’t assess the state of external accounts (e.g., users or policies in external accounts) for security and privacy reasons.

  • Key Limitations:

    • Certain IAM condition keys are considered for access analysis.

    • Findings focus on resource-based policies and external access only.

    • Potential false positives may occur to ensure comprehensive analysis and avoid missing external access risks.

Unused Access Findings:

  • Purpose: Identifies unused permissions, roles, passwords, or access keys within your AWS environment based on a specified inactivity period.

  • Conditions Triggering Findings:

    • A role is inactive for the specified number of days.

    • Permissions, passwords, or access keys are unused for the defined duration.

    • Note: These findings are available only through the ListFindingsV2 API.

  • How it Works:

    • Requires creating a separate analyzer for unused access findings.

    • The analyzer reviews last accessed information for roles, user keys, and passwords across accounts.

    • Granular Insights: Helps identify unused permissions at the service or action level for deeper investigation.

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Last updated 8 months ago