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Network Security Techniques

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Title: Network Security Techniques


1
Network SecurityTechniques
  • by
  • Bruce Roy Millard
  • Division of Computing Studies
  • Arizona State University
  • Bruce.Millard_at_asu.edu

2
What is Network Security
  • Hardware computers, routers, etc
  • Networks ethernet, wireless
  • Communication
  • Intruders
  • Mitigation

3
What is Network SecurityHardware
  • Workstation
  • Servers (and load balancers)
  • Printers (and other shared devices)
  • Routers/switches/hubs
  • Security devices (firewalls, IDS, etc)

4
What is Network SecurityNetworks
  • Connectivity
  • Ethernet (cable, DSL, TP, 1Gbps up)
  • Wireless (radio waves, 802.11?, satellite)
  • LAN, CAN, MAN, WAN, PAN
  • Internet

5
What is Network SecurityCommunication
  • E-mail
  • FTP
  • HTTP/HTML
  • Voice, video, teleconferencing
  • SSH/SCP

6
What is Network SecurityIntruders
7
What is Network SecurityIntruders
  • Eavesdroppers
  • Insertion
  • Hijacking
  • Spoofing
  • Denial of Service
  • Trojan horse software
  • Lurkers (viruses and worms)

8
What is Network SecurityMitigation
  • Prevent
  • Avoid
  • Detect
  • Assess
  • React

9
Security Goals
  • Privacy
  • Integrity
  • Non-repudiation
  • Trust relationships internal external
  • Authentication supports authorization
    supports fine-grained access control

10
Security Model(Protection)
  • Assets - identify
  • Risks - characterize
  • Counter-measures - obtain
  • Policy create where no laws exist

11
Security Methods
  • Shields firewalls, virus scanners
  • Selective shields - access control (VPN)
  • Protocols IPsec, SSL/TLS
  • Intrusion Detection Systems
  • Training awareness
  • Redundancy backups, encryption,
    hashes, digests

12
Prevention(Attempts)
  • Firewalls have holes
  • Virus Scanners behind the times
  • Physical Security
  • Know Fundamentals routing, IP, TCP, ARP,
    DHCP, applications
  • Encryption PGP, SSH, SSL/TLS, Ipsec,
    stenography, public key, symetric key
  • Patches windowsupdate, up2date, yum

13
Avoidance
  • Firewalls VPNs Ipsec, SSL,
    access control
  • Host hardening personal firewalls, ssh,

    iptables
  • Proxy servers squid (Web content cache)
  • Honeynets/honeypots - redirection

14
DetectionFeeds Avoidance
  • Vulnerability Scanning netstat, netview,
    netmon, nmap,
    Nessus
  • Network-based IDS snort, kismet, ACID,
    tcpdump, ethereal,
    windump,
    netstumbler
  • Host-based IDS TCPwrappers, xinetd,
    tripwire, logsentry,
    portsentry
  • Web security, Cisco logs

15
Exploits
  • Password cracking WEP cracking
  • Denial of Service
  • OS typing null session, xmas tree, . . .
  • OS configuration sadmin password, . . .
  • Application holes buffer overflow, NFS,
    rpc, netbios, BIND,
    sendmail, CGI,etc
  • Dumpsec, pingwar, . . .

16
URLs of Interest
  • http//www.sans.org
  • http//www.giac.org
  • http//www.isc2.org
  • http//www.cissp.com

17
10 Domains of the CBK
  • Security Management Practices
  • Security Architecture and Models
  • Access Control Systems Methodology
  • Application Development Security
  • Operations Security
  • Physical Security
  • Cryptography
  • Telecommunications, Network, Internet Security
  • Business Continuity Planning
  • Law, Investigations, Ethics

18
NS Applications
  • netstat
  • tcpview
  • netmon
  • netstumbler
  • windump
  • nmap
  • ethereal
  • snortiquette

19
www.sans.org/top20(vulnerabilities)
  • Top Vulnerabilities to Windows Systems
  • W1 Web Servers Services
  • W2 Workstation Service
  • W3 Windows Remote Access Services
  • W4 Microsoft SQL Server (MSSQL)
  • W5 Windows Authentication
  • W6 Web Browsers
  • W7 File-Sharing Applications
  • W8 LSAS Exposures
  • W9 Mail Client
  • W10 Instant Messaging

20
www.sans.org/top20(vulnerabilities)
  • Top Vulnerabilities to UNIX Systems
  • U1 BIND Domain Name System
  • U2 Web Server
  • U3 Authentication
  • U4 Version Control Systems
  • U5 Mail Transport Service
  • U6 Simple Network Management Protocol (SNMP)
  • U7 Open Secure Sockets Layer (SSL)
  • U8 Misconfiguration of Enterprise Services
    NIS/NFS
  • U9 Databases
  • U10 Kernel

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