* Your assessment is very important for improving the workof artificial intelligence, which forms the content of this project
Download Securing Network
Survey
Document related concepts
Policies promoting wireless broadband in the United States wikipedia , lookup
Net neutrality law wikipedia , lookup
Deep packet inspection wikipedia , lookup
Zero-configuration networking wikipedia , lookup
Wake-on-LAN wikipedia , lookup
Recursive InterNetwork Architecture (RINA) wikipedia , lookup
Computer network wikipedia , lookup
Computer security wikipedia , lookup
Network tap wikipedia , lookup
Airborne Networking wikipedia , lookup
Wireless security wikipedia , lookup
Piggybacking (Internet access) wikipedia , lookup
Cracking of wireless networks wikipedia , lookup
Transcript
Securing Network – Wireless – and Connected Infrastructures Fred Baumhardt Infrastructure Solutions Consulting Microsoft Security Solutions, Feb 4th, 2003 Agenda Defining the Datacenter Network Security Problem Penetration Techniques and Tools Network Defence-in-Depth Strategy Perimeter and Network Defences Operating System and Services Defences Application Defences Data Defences The Datacenter Problem We All Face • • • • Systems organically grown under “Project” context No clear best practice from vendors Security often bolted on as an afterthought Fear of change – Time to Market Some Core Systems Extranets Internet Systems Project 1…n System Branch Offices Departments The Big Picture of Security OS hardening is only one component of security strategy AND Firewalls are not a Panacea Entering the Bank Branch doesn’t get you into the vault Security relies on multiple things People and skills Process and incident management Internal Technologies – E.G. OS, Management Tools, switches, IDS, ISA Edge Technologies – Firewalls, ISA, IDS Threat Modelling Internal Users are usually far more dangerous Normal employees have tools, experience, and know your systems – after all they use them Customers usually take little internal protection precautions – preferring to focus on external Firewalls, and DMZ scenarios for security Data is now being hacked – not just systems The First Phase of Hacking Information Gathering and Intelligence Port Scanning – Banner Grabbing – TCP/IP Packet Profiling – TTL Packet Manipulating Researching network structure – newsgroup posts, outbound emails, these all hold clues to network design . The Second Phase of Hacking Analysis of Collected Information Process relevant bits of data about target network Formulate an attack plan For Example: Attacker wont use SUN specific attacks on W2K Boxes, won’t use NT Attacks on .NET etc.. Hacker Forums, websites, exploit catalogues The Third Phase of Hacking The Compromise OS Specific Attacks Denial of Service Attacks Application Attacks Buffer Overflows URL String Attacks Injection Cross-site Scripting Attacks Compromised system jumps into another Networking and Security The network component is the single most important aspect to security Wireless is based on Radio transmission and reception – not bounded by wires Some sort of encryption is thus required to protect open medium Ethernet is also just about as insecure Network Problems ctd Use encryption and authentication to control access to network WEP – Wired Equivalent Privacy 802.1X - using Public Key Cryptography Mutually authenticating client and network Securing a Wireless Connection Three major strategies WEP – basic low security simple solution VPN – use an encrypted tunnel assuming network is untrusted 802.1X family – Use PKI to encrypt seamlessly from client to access point Usually complex to implement but then seamless to user Substantial investment in PKI Also vendor specific like Leap What about the wired network ? This is where the hackers kill you Currently a “total trust” model You can ping HR database, or chairman's PC, or accounting system in Tokyo We assume anyone who can get in to our internal network is trusted – and well intentioned Ethernet and TCP/IP is fundamentally insecure VPN Extend the “internal” network space to clients in internet Extends the security perimeter to the client Main systems are PPTP – L2TP/IPSEC Corporate Net or Client IP Tunnel A Host Corporate Net in Reading Router D Router C B Host Internet How the Architecture Can Prevent Attack I N T E R N E T B O R D E R P e r i m e t e r Internet Redundant Routers Redundant Firewalls VLAN VLAN . VLAN Client and Site VPN DNS & SMTP Proxy Redundant Internal Firewalls Infrastructure Network – Perimeter Active Directory NIC teams/2 switches VLAN I N T E R N A L Intrusion Detection NIC teams/2 switches VLAN Remote data center Data Network – SQL Server Clusters VLAN Messaging Network – Exchange Infrastructure Network – Internal Active Directory VLAN Management Network – MOM, deployment VLAN VLAN VLAN Client Network VLAN RADIUS Network VLAN Intranet Network - Web Servers How do I do it ? A Flat DMZ Design to push intelligent inspection outwards ISA layer 7 filtration – RPC – SMTP – HTTP Switches that act like firewalls IPSec where required between servers Group Policy to Manage Security 802.1X or VPN into ISA servers treating Wireless as Hostile Internal IDS installed TCP 443: HTTPS Or TCP 443: HTTPS Internet Stateful Packet Filtering Firewall TCP 80: HTTP Application Filtering Firewall (ISA Server) Wireless Exchange Server Call To Action Take Action – your network transport is insecure Read and use security operations guides for each technology you use Mail me with questions – [email protected] If I didn’t want to talk to you I would put a fake address Use the free MS tools to establish a baseline and stay on it Attack yourself – you will learn Wherever you go – go securely ! ____________________________________________________________