GSEC 401.2 Defense In Depth Latest Update Graded A+ Inbound Network Traffic ✔✔* Monitor Inbound network prevention Outbound Network Traffic ✔✔* Monitor Outbound network detection * Majority of problems are outbound defense in depth ✔✔* Diversify to keep the vulnerabilities at a minimum Risk (Formula) ✔✔Threat x Vulnerability (to that threat) Three TOP 20 Lists (Outbound Traffic) ✔✔1) Number Connections 2) Length of Connections 3) Amount of Data ------------------------ (High false positives, but increase the accuracy of Vulnerabilities) 4a) Percent of Encrypted Traffic 4b) Destination IP Address Risk Analysis Questions ✔✔* Before a company spends a dollar of it's money or a minute of its time; answer the 3 questions ------------- 1) What is the *Risk* 2) Is it the *Highest Priority* risk 3) *Cost Effective* way of reducing the risk Top 5 List of Threats ✔✔Critical Data and Process that support it Likely Threats Most likely Vulnerabilities Questions for CEOs ✔✔What are the things that worry you most? What could cause you to be removed from the board? What keeps you up at night? Reduce Risk ✔✔To reduce risk lets reduce Vulnerabilities 3 Goals of Security (CIA Triad) ✔✔1) Confidentiality / Disclosure 2) Integrity / Alteration 3) Availability / Destruction Confidentiality vs Disclosure ✔✔Only shared among authorized persons or organisations Integrity vs Alteration ✔✔Authentic an complete. Sufficient and Accurate Trustworthy and reliable Availability vs Destruction ✔✔Accessible when needed by those who need it Network Visibility Tree ✔✔* Breakdown by IP Address and Port ex 10.0.0.X / \ 10.0.0.3 10.0.0.10 / | \ / | \ 23 110 5150 43 210 443 * Identify unnecessary use of ports 4 approa ches to Defense In Depth ✔✔1) Uniform Protection 2) Protected Enclaves 3) Information Centric 4) Threat Vector Analysis Uniform Protection ✔✔1) Most common approach to DiD 2) Firewall, VPN, Intrusion, Detection, Antivirus, Patching 3) All parts of the or ganization receive equal protection 4) Treats all the systems the same Protected Enclaves ✔✔1) Work groups that require additional protection are segmented from the rest of the internal organization 2) Restricting access to critical segments 3) Internal Firewalls
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