+Filter Network Traffic

Filter Network Traffic

Employ network appliances and endpoint software to filter ingress, egress, and lateral network traffic. This includes protocol-based filtering, enforcing firewall rules, and blocking or restricting traffic based on predefined conditions to limit adversary movement and data exfiltration. This mitigation can be implemented through the following measures: Ingress Traffic Filtering: - Use Case: Configure network firewalls to allow traffic only from authorized IP addresses to public-facing servers. - Implementation: Limit SSH (port 22) and RDP (port 3389) traffic to specific IP ranges. Egress Traffic Filtering: - Use Case: Use firewalls or endpoint security software to block unauthorized outbound traffic to prevent data exfiltration and command-and-control (C2) communications. - Implementation: Block outbound traffic to known malicious IPs or regions where communication is unexpected. Protocol-Based Filtering: - Use Case: Restrict the use of specific protocols that are commonly abused by adversaries, such as SMB, RPC, or Telnet, based on business needs. - Implementation: Disable SMBv1 on endpoints to prevent exploits like EternalBlue. Network Segmentation: - Use Case: Create network segments for critical systems and restrict communication between segments unless explicitly authorized. - Implementation: Implement VLANs to isolate IoT devices or guest networks from core business systems. Application Layer Filtering: - Use Case: Use proxy servers or Web Application Firewalls (WAFs) to inspect and block malicious HTTP/S traffic. - Implementation: Configure a WAF to block SQL injection attempts or other web application exploitation techniques.

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 Port Knocking
blocks Adversary-in-the-Middle
blocks Protocol Tunneling
blocks Application Exhaustion Flood
blocks Exploit Public-Facing Application
blocks DHCP Spoofing
blocks Reflection Amplification
blocks System Binary Proxy Execution
blocks DNS
blocks Multi-hop Proxy
blocks BITS Jobs
blocks Traffic Signaling
blocks Exfiltration Over Symmetric Encrypted Non-C2 Protocol
blocks Mail Protocols
blocks VNC
blocks Network Denial of Service
blocks Verclsid
blocks Service Exhaustion Flood
blocks Endpoint Denial of Service
blocks Lateral Tool Transfer
blocks Unsecured Credentials
blocks Application or System Exploitation
blocks File Transfer Protocols
blocks Exfiltration Over Alternative Protocol
blocks Remote Access Tools
blocks Forced Authentication
blocks Socket Filters
blocks Direct Network Flood
blocks Network Device Configuration Dump
blocks Ingress Tool Transfer
blocks Remote Desktop Software
blocks Non-Application Layer Protocol
blocks Exfiltration Over Unencrypted Non-C2 Protocol
blocks Publish/Subscribe Protocols
blocks Proxy
blocks OS Exhaustion Flood
blocks Transfer Data to Cloud Account
blocks Data from Configuration Repository
blocks Network Boundary Bridging
blocks SMB/Windows Admin Shares
blocks ARP Cache Poisoning
blocks Data from Cloud Storage
blocks Exfiltration Over Asymmetric Encrypted Non-C2 Protocol
blocks Web Protocols
blocks SNMP (MIB Dump)
blocks Application Layer Protocol
blocks Network Address Translation Traversal
blocks Name Resolution Poisoning and SMB Relay
blocks Cloud Instance Metadata API
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