+Network Segmentation

Network Segmentation

Network segmentation involves dividing a network into smaller, isolated segments to control and limit the flow of traffic between devices, systems, and applications. By segmenting networks, organizations can reduce the attack surface, restrict lateral movement by adversaries, and protect critical assets from compromise. Effective network segmentation leverages a combination of physical boundaries, logical separation through VLANs, and access control policies enforced by network appliances like firewalls, routers, and cloud-based configurations. This mitigation can be implemented through the following measures: Segment Critical Systems: - Identify and group systems based on their function, sensitivity, and risk. Examples include payment systems, HR databases, production systems, and internet-facing servers. - Use VLANs, firewalls, or routers to enforce logical separation. Implement DMZ for Public-Facing Services: - Host web servers, DNS servers, and email servers in a DMZ to limit their access to internal systems. - Apply strict firewall rules to filter traffic between the DMZ and internal networks. Use Cloud-Based Segmentation: - In cloud environments, use VPCs, subnets, and security groups to isolate applications and enforce traffic rules. - Apply AWS Transit Gateway or Azure VNet peering for controlled connectivity between cloud segments. Apply Microsegmentation for Workloads: - Use software-defined networking (SDN) tools to implement workload-level segmentation and prevent lateral movement. Restrict Traffic with ACLs and Firewalls: - Apply Access Control Lists (ACLs) to network devices to enforce "deny by default" policies. - Use firewalls to restrict both north-south (external-internal) and east-west (internal-internal) traffic. Monitor and Audit Segmented Networks: - Regularly review firewall rules, ACLs, and segmentation policies. - Monitor network flows for anomalies to ensure segmentation is effective. Test Segmentation Effectiveness: - Perform periodic penetration tests to verify that unauthorized access is blocked between network segments.

1. Overview

1.1 References

1.2 Identified Requirements

1.3 Related Regulations

2. Identified Requirements

Requirements

3. Related Regulations

Regulations

Linked Issues

Issuelinks
is related to Mitigations
blocks Runtime Data Manipulation
blocks Container and Resource Discovery
blocks Account Manipulation
blocks Create Account
blocks Remote Desktop Protocol
blocks Exploit Public-Facing Application
blocks Network Device Configuration Dump
blocks Cloud Account
blocks RDP Hijacking
blocks Service Stop
blocks Exploitation of Remote Services
blocks Exfiltration Over Alternative Protocol
blocks Build Image on Host
blocks Domain Trust Discovery
blocks Additional Cloud Credentials
blocks Deploy Container
blocks Network Service Discovery
blocks Remote Service Session Hijacking
blocks Non-Standard Port
blocks External Remote Services
blocks Software Deployment Tools
blocks Wi-Fi Networks
blocks Distributed Component Object Model
blocks Exfiltration Over Asymmetric Encrypted Non-C2 Protocol
blocks Adversary-in-the-Middle
blocks Container API
blocks Data from Configuration Repository
blocks Exfiltration Over Unencrypted Non-C2 Protocol
blocks Non-Application Layer Protocol
blocks Data Manipulation
blocks SNMP (MIB Dump)
blocks Name Resolution Poisoning and SMB Relay
blocks Windows Remote Management
blocks Exfiltration Over Symmetric Encrypted Non-C2 Protocol
blocks Domain Account
blocks Network Sniffing
blocks Trusted Relationship
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