Comprehensive Network Security Implementation
Addressing five critical vulnerabilities with a defense-in-depth approach
Addressing five critical vulnerabilities with a defense-in-depth approach
A defense-in-depth strategy for enterprise-grade network security
Isolated network zones with clearly defined security boundaries
Security controls implemented across all OSI model layers
Meshed core network with failover capabilities
Centralized authentication and strict authorization
Project Introduction Video
Our solution tackles five major cybersecurity vulnerabilities
Heartbleed is a critical vulnerability in OpenSSL that exposes memory segments, potentially compromising private keys and sensitive data. The bug allows attackers to extract memory contents including encryption keys, user credentials, and session cookies.
SQL injection occurs when malicious SQL statements are inserted into entry fields for execution. It allows attackers to bypass authentication, access, modify, or delete data in databases, compromising data integrity and confidentiality.
MITM attacks occur when attackers position themselves between communicating parties, intercepting and potentially altering communication. This allows them to eavesdrop on sensitive information or hijack sessions.
Route poisoning attacks involve injecting falsified routing updates to alter routing tables, causing traffic redirection or denial of service. This can lead to traffic being routed through attacker-controlled systems for interception.
Phishing attacks use social engineering to deceive users into revealing credentials or installing malware. These attacks often serve as the initial access point for more sophisticated network intrusions.
How we secured the network across all OSI layers
ASA 5505 with deep packet inspection, application awareness, and stateful filtering capabilities to protect against Heartbleed and other application-layer attacks.
access-list OUTSIDE_IN extended permit icmp any any echo-reply
access-list OUTSIDE_IN extended permit tcp any any eq 443
access-list OUTSIDE_IN extended deny ip any any
policy-map global_policy
class inspection_default
inspect ftp
inspect httpDatabase isolation using dedicated VLAN with strict access controls to prevent SQL injection attacks and limit lateral movement.
vlan 50
name Database
interface FastEthernet0/2
description Database Server
switchport mode access
switchport access vlan 50
switchport port-securityMAC address binding and port violation protection to prevent unauthorized devices from connecting to the network and mitigate MITM attacks.
interface range FastEthernet0/2 - 12
switchport port-security
switchport port-security maximum 1
switchport port-security mac-address sticky
switchport port-security violation shutdownACL-based protection for routing updates to prevent route poisoning attacks and maintain routing table integrity.
access-list 101 permit udp host 192.168.10.2 host 224.0.0.9 eq 520
access-list 101 permit udp host 172.16.12.2 host 224.0.0.9 eq 520
access-list 101 deny udp any host 224.0.0.9 eq 520
access-list 101 permit ip any anyCentralized authentication, authorization, and accounting using TACACS+ and RADIUS protocols to mitigate phishing and credential theft.
aaa new-model
aaa authentication login default group tacacs+ local
aaa accounting exec default start-stop group tacacs+
tacacs-server host 192.168.1.2 key AAA-Secret-Key123Hardened wireless configuration with WPA2-PSK, AES encryption, and VPN for secure remote access.
SSID: Secure_Network
Authentication: WPA2-PSK
Encryption Type: AES
PSK Pass Phrase: WirelessPassphrase123Implementation Details Video
Comprehensive testing to verify security controls
Our security implementation was validated through a series of tests designed to simulate real-world attack scenarios. Each test targeted specific vulnerabilities and security controls to verify their effectiveness.
Simulated Heartbleed exploits were successfully detected and blocked by the ASA firewall before reaching protected resources.
Database isolation effectively prevented SQL injection attempts with all unauthorized access blocked at the network layer.
Port security successfully prevented MAC flooding attacks and unauthorized devices were blocked from connecting to the network.
ACL-based routing protection successfully blocked unauthorized routing updates, maintaining routing table integrity.
Centralized authentication works correctly with failed login attempts properly logged and tracked.
Port-based authentication was configured but testing was limited by simulation environment capabilities.
Meet the engineers behind this implementation
Network Security Architect
Specialized in network design, security architecture, and defense-in-depth strategies. Led the implementation of firewall, routing, and authentication components.
Cyber Defense Engineer
Expert in vulnerability assessment, penetration testing, and security validation. Responsible for security testing and performance optimization.