Limit Access to Resource Over Network

Restrict access to network resources, such as file shares, remote systems, and services, to only those users, accounts, or systems with a legitimate business requirement. This can include employing technologies like network concentrators, RDP gateways, and zero-trust network access (ZTNA) models, alongside hardening services and protocols. This mitigation can be implemented through the following measures:

Audit and Restrict Access:

• Regularly audit permissions for file shares, network services, and remote access tools.
• Remove unnecessary access and enforce least privilege principles for users and services.
• Use Active Directory and IAM tools to restrict access based on roles and attributes.

Deploy Secure Remote Access Solutions:

• Use RDP gateways, VPN concentrators, and ZTNA solutions to aggregate and secure remote access connections.
• Configure access controls to restrict connections based on time, device, and user identity.
• Enforce MFA for all remote access mechanisms.

Disable Unnecessary Services:

• Identify running services using tools like netstat (Windows/Linux) or Nmap.
• Disable unused services, such as Telnet, FTP, and legacy SMB, to reduce the attack surface.
• Use firewall rules to block traffic on unused ports and protocols.

Network Segmentation and Isolation:

• Use VLANs, firewalls, or micro-segmentation to isolate critical network resources from general access.
• Restrict communication between subnets to prevent lateral movement.

Monitor and Log Access:

• Monitor access attempts to file shares, RDP, and remote network resources using SIEM tools.
• Enable auditing and logging for successful and failed attempts to access restricted resources.

Tools for Implementation

File Share Management:

• Microsoft Active Directory Group Policies
• Samba (Linux/Unix file share management)
• AccessEnum (Windows access auditing tool)

Secure Remote Access:

• Microsoft Remote Desktop Gateway
• Apache Guacamole (open-source RDP/VNC gateway)
• Zero Trust solutions: Tailscale, Cloudflare Zero Trust

Service and Protocol Hardening:

• Nmap or Nessus for network service discovery
• Windows Group Policy Editor for disabling SMBv1, Telnet, and legacy protocols
• iptables or firewalld (Linux) for blocking unnecessary traffic

Network Segmentation:

• pfSense for open-source network isolation

1. Overview

1.1 References

1.2 Identified Requirements

1.3 Related Regulations

2. Identified Requirements

3. Related Regulations

Linked Issues

• MITREATTACK -

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