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Linux Security, from Concept to Tooling

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Michael Boelen
Michael Boelen

Linux is considered to be a secure operating system by default. Still there is a lot to learn about system hardening and technical auditing. This 1-hour presentation explains the need for hardening and auditing of your systems. We discussed some additional documents and tools, to further help this endeavor. This presentation is suitable for both beginners and those with experience in system hardening.

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Linux Security Concept → Tooling Utrecht, 16 January 2016 Michael Boelen michael.boelen@cisofy.com
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Goals 1. Learn what to protect 2. Know some strategies 3. Learn about tooling Focus: Linux 3
Agenda Today 1. Hardening 2. Auditing 3. Guides and Tools Bonus: Lynis demo 4
Michael Boelen ● Open Source Security ○ Rootkit Hunter (malware scan) ○ Lynis (security audit) ● 150+ blog posts at Linux-Audit.com ● Founder of CISOfy 5
Hardening
Q: What is Hardening?
Q: Why Hardening?
10
Hardening ● New defenses ● Existing defenses ● Reduce weaknesses (attack surface) 11 Photo Credits: http://commons.wikimedia.org/wiki/User:Wilson44691
Myth After hardening I’m done 12
Fact ● Security should be an ongoing process ● Which means it is never finished ● New attacks = more hardening ○ POODLE ○ Hearthbleed 13
Hardening What to harden? ● Operating System ● Software + Configuration ● Access controls 14
Hardening Operating System ● Services ● Users ● Permissions 15
Hardening Software ● Minimal installation ● Configuration ● Tuning 16
Hardening Users and Access Controls ● Who can access what ● Password policies ● Accountability 17
Hardening Encryption ● Good: Encryption solves a lot ● Bad: Knowledge required ● Ugly: Easy to forget 18
Technical Auditing
Auditing Why audit? ● Checking defenses ● Assurance ● Quality Control 20
Common Strategy 1. Audit 2. Get a lot of findings 3. Start hardening 4. ……. 5. Quit 21
Improved Strategy 1. Focus 2. Audit 3. Focus 4. Harden 5. Repeat! 22
Guides and Tools
Options ● Benchmarks and Guides ● SCAP ● Other resources ● Tools 24
Benchmarks / Guides ● Center for Internet Security (CIS) ● NIST / NSA ● OWASP ● Vendors 25
Benchmarks / Guides Pros Free to use Detailed You are in control 26 Cons Time intensive Usually no tooling Limited distributions Delayed releases
Tooling
Tools Tools make life easier, right? Not always... 28
Tools Problem 1: There aren’t many 29
Tools Problem 2: Usually outdated 30
Tools Problem 3: Limited in their support 31
Tools Problem 4: Hard to use 32
Tool 1: SCAP
SCAP ● Security ● Content ● Automation ● Protocol 34
SCAP Combination of: ● Markup ● Rules ● Tooling ● Scripts 35
SCAP features ● Common Vulnerabilities and Exposures (CVE) ● Common Configuration Enumeration (CCE) ● Common Platform Enumeration (CPE) ● Common Vulnerability Scoring System (CVSS) ● Extensible Configuration Checklist Description Format (XCCDF) ● Open Vulnerability and Assessment Language (OVAL) Starting with SCAP version 1.1 ● Open Checklist Interactive Language (OCIL) Version 2.0 Starting with SCAP version 1.2 ● Asset Identification ● Asset Reporting Format (ARF) ● Common Configuration Scoring System (CCSS) ● Trust Model for Security Automation Data (TMSAD) 36
Complexity? List of Tables (Common Configuration Scoring System (CCSS)) Table 1. Access Vector Scoring Evaluation ..................................................................................8 Table 2. Authentication Scoring Evaluation ..................................................................................9 Table 3. Access Complexity Scoring Evaluation.........................................................................10 Table 4. Confidentiality Impact Scoring Evaluation.....................................................................11 Table 5. Integrity Impact Scoring Evaluation ..............................................................................12 Table 6. Availability Impact Scoring Evaluation ..........................................................................12 Table 7. General Exploit Level Scoring Evaluation.....................................................................13 Table 8. General Remediation Level Scoring Evaluation ...........................................................14 Table 9. Local Vulnerability Prevalence Scoring Evaluation.......................................................15 Table 10. Perceived Target Value Scoring Evaluation ...............................................................15 Table 11. Local Remediation Level Scoring Evaluation..............................................................16 Table 12. Collateral Damage Potential Scoring Evaluation ........................................................17 37
SCAP Overview Pros Free to use Focused on automation 38 Cons Limited distributions Complexity Hard to customize
Tool 2: Lynis
Lynis 40
Lynis Goals ● Perform a quick security scan ● Collect data ● Define next hardening steps 41
Lynis Background ● Since 2007 ● Goals ○ Flexible ○ Portable 42
Lynis Open Source Software ● GPLv3 ● Shell ● Community 43
Lynis Simple ● No installation needed ● Run with just one parameter ● No configuration needed 44
Lynis Flexibility ● No dependencies* ● Option to extend easily ● Custom tests * Besides common tools like awk, grep, ps 45
Lynis Portability ● Run on all Unix platforms ● Detect and use “on the go” ● Usable after OS version upgrade 46
How it works 1. Initialise 2. OS detection 3. Detect binaries 4. Run helpers/plugins/tests 5. Show report 47
Running 1. lynis 2. lynis audit system 3. lynis audit system --quick 4. lynis audit system --quick --quiet 48
Demo?
Conclusions ● Protect your precious ● Hardening ● Do regular checks 50
You finished this presentation Success!
Learn more? Follow ● Blog Linux Audit (linux-audit.com) ● Twitter @mboelen 52

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