quartz/content/notes/13-pen-testing-2.md

title	aliases	tags	sr-due	sr-interval	sr-ease
13-pen-testing-2		conp210 lecture	2022-11-15	11	270

Intrusion detection cont.

Auditing

a thorough prces of investiagtina nd analaysing aa system for vilnerabilities

• e.g., pen testing

can also refer to logging (esp. in a databse context)

Firewalls

protect aginst network intrusions

• built in or third party
  • built in - integration quality of control. ofen light convenince features maybe no GUI
• black/whitelist
• mandatory access control on routers
  • mandatory access control
    • e.g., block a netork port
    • block icmp packets (some sytems are vulnerable)
• application level filtering for desktop systems
  • finer grained control for linking rules to applications themselves (processes)
  • router doesn't know about applications
  • may not trust an aplication to connect o a web server but do trust other.
  • dont have to block everything on that webserver
• provide altering and logging (avoid crying wolf)
  • "end user alert fatigue"

northcutt and novak - network intrusion detection

Intrustion detection systems

• often bundled with commercial routers, network storage devices (NAS, SAN) - "cloud storage within organisation"
• can also be host based (HIDS) "situated aroud network"
• intrusion can be identified by know signatures (like pattern-based virus scanners)
• can also be anomaly-based (using heuristics)

other intrusion detection topics

• file integrity checking
  • hash checking to detect changes
• backup and recovery

keeping up to date with vulnerabilites

• CERT NZ
• US-CERT
• CVE at MITRE
• NVD (us NIST national vulnerabilities database)
• conferences such as DEF CON

Sting operations

deliberately place sofware where it will interact with attacks, somewhat resembling a police sting operation.

Honeypot

• decoy service used to attact attackers
• divert attackers from real service
• identify attack origin - analyse attack - create countermeasures
• honey-nets - co-ordiniated honeypots. - analyse malware infection behaviour (malware epidemiology)
• bogus email address lists to hinder spammers
• individual e-mail address can be used to gather and analyse spam smessages

Tarpits

• similar to honeypots but for slowing attack not diverting
• often deployed as a proxy server in front of the real service
  • talks to a web server as a client on behalf of another client
  • intermediate between client and server
  • logging, throttling,

Heroic human tarpits

• 

DNS blackholes/sinkholes

• aka real time blackhole list (RBL)
• anti-spam measure, widely used by ISPs
• traditional SMTP is highly vulnerable to abuse
  • STMP assumes people "will be nice".
  • you can list whoever you like as the sender
• open mail relays are readly exploited by spammers
  • mail servers recieve email from anywhere and send to anyone
  • exlpoited by spammers
  • can usually be identified by AI and sent to blackholes
• use existing DNS protocols to communicate (OK/bad status)

Software

• mac os activity monitor
• mac os console (sys logs)
• tcpdump
• iptraf
• WireShark
• Snort (open source NIDS)
• Fail2Ban ( intrusion prevention system usins logfile monitoring)
• TCP wrappers (historically significant)
• SATAN

Pen-Testing

checking if system is secure. Simulated attacks of system to detect vulnerabilities

• specialised and technical
• often done by consultants
• mindset of attacker
• complements intrusion detection
  • but proactive not reactive

tools

• same tools as attackers
• develop own tools
• automate
  • scripts
  • dedicated hardware
  • parrallel/dist attacks
• create new attacks

e.g., software

• nmap - network exploration tool
  • scan ports
  • reports finding
    • os, version
    • used to find vulnerabilities
• netcat/ncat interact with network services
• nessus
• hashcat - password cracking
• sqlmap (SQL database pen tester)
  • find account with default passwords etc
• specialised pen-testing OS distribution
  • e.g., blackbox linux

Phases

• reconnaissance (info gathering) (e.g., finding relevant ip addresses)
• scanning (e.g.,, nmap)
  • which hosts are availale
  • which ports
  • etc
• gaining access (attack)
  • may require sequenced attacks
• maintaining access (avoid detection)
• covering tracks (remove files, edit logs, change timestamps etc)