1 IT Security: New Trends, Ancient Techniques Alec Muffett Chief Architect, Security Sun Professional Services EMEA
2 Alec Muffett: Work SunPS Europe, Mid-East & Africa Chief Architect for Security, EMEA 18+ years of Network Security 12+ years for Sun Microsystems Specialising in: Network Architecture Network Security Auditing Authentication & Cryptography
3 Alec Muffett: Leisure Open Source Author Crack Password Cracker CrackLib Password Integrity Checker Original USENET Security FAQ Various other security stuff RSA Factorisation BlackNet: 384-bit Secret/PGP key break RSA155: world's first 512bit RSA break
4 Proposition There are many security components available today... Components == Tools, Utilities, Appliances... Available across many platforms... Addressing many specific security risks... Multi-billion dollar industry But...
5 Proposition Many useful security components are available, but... They are easily misassembled, misused or misconfigured They are often better used in combination, rather than individually
6 Further... Regarding components People tend to seek homogeneity, whereas diversity yields greater robustness, at the cost of management complexity Without proper design/architecture, you will be wasting your money It is perfectly possible to spend $1,000,000's and yet have a terribly insecure network... It is further possible to spend almost nothing, and yet improve your security enormously.
7 Therefore, today... We shall: review what may go wrong. review how it can go wrong. suggest a strategy, even a design philosophy which helps to address it.
8 As a first illustration... Consider this problem: The misassembly of security components Viz: Right Components, Put Together Wrong Example: TopBox Breaking Video (2m 50s)
10 So Let's... Recap some history of IT Security Compare it to the State of the Art Review individual security tools, and the issues they sought to address Determine whether we are still defending against the older security issues
11 IT Security A Rough History
12 IT Security Eras Computers too complex for ordinary people yielding security through obscurity
13 IT Security Eras Advisory separation of different users within a computer Technology (mostly) not advanced enough to support mandatory separation. Lack of VM, etc
14 IT Security Eras Partitioning of file access via robust file permissions Strong virtual memory to enforce mandatory user/program separation......but not in all platforms (eg: Personal Computers)
15 IT Security Eras Password security extended to basic network services Networking too complex for ordinary people yielding security through obscurity again...yet early buffer-overflow exploits occur Personal Computers virus-ridden from lack of technology to implement integrity Compartmented/Certified Systems considered exotic ; Military & Banking only?
16 IT Security Eras now Partitioning of service access via firewalls Firewalling used as panacea Impact upon network architecture and throughput Personal Computers begin to employ strong permissions, VM (etc) to ensure integrity......boosting subsequent growth in macroviruses and active-content exploits in popular applications, to fill the gap.
17 IT Security Future? What is the next big, open resource that is fit to protect with mandatory controls? Encapsulated Data Security / Per-Object Crypto? Proximity wireless / Bluetooth? SMS-Firewalling & Antivirus? Your guess is as good as mine...
18 Implementation Cycles Generalising: New resource/tool becomes available Identity, Filestore, Network, ... Resource/tool grows in popularity Access restriction to/by the resource is layered-on afterwards Passwords, Permissions, Firewalls, Virus scanner...
19 Security Deployment Problem: Access controls which are designed after the fact are often sub-optimal Eg: Password protection on plaintext HTTP Eg: Session-State Cookies in HTTP Eg: 40-bit WEP in b Arguably all of the above could have been forseen and implemented properly
20 Security Deployment In security, often only the latest trendy issues are managed......to the detriment of others. Weak file permissions on a big server Ignored because: The firewall does all our security!!! How many people here have hardened every server they own?
21 So Why Do Security? What are we protecting? Data has value to us, and to others. Data is valuable but intrinsically defenceless. Data exists in more places for shorter or longer periods of time caches, routers; how many of these places do you actually own? How shall we protect it? So what we actually do to protect that which we value?
22 Issues of Implementation We actually protect the containers where data exists! But: data exists in many places! Hence the need to defend: Multiple data containers In multiple places At the same time. This explains why security is complicated
23 Same Problems, Repeating Rough Categories of Challenge: Over-reliance on one security technology Blithe trust in what you are told Reusable weak authentication The right tools, put together wrongly
24 Same Problems, Repeating Overreliance upon single technologies Obscurity Permissions Passwords Firewalls IDS For instance: Potato famine Antibiotic Resistance
25 Same Problems, Repeating Blithe trust in what you are told Unauthenticated identity Buffer overflows (sometimes) WWW Cookies For instance: Forged passports / identity papers Social engineering
26 Same Problems, Repeating Reusable weak authentication Plaintext passwords Unencrypted Communications Compare: Story of Ali-Baba and the 40 Thieves Reusable Password: Open Sesame Published circa 950AD A 1000-year-old IT security issue!
27 Same Problems, Repeating Right Tools, Assembled Wrongly Firewalls with far too many holes Firewalls with too much complexity Same firewall technology everywhere Poor Network Design Example: Simple SSL Accelerator (later...)
28 Attempts to Address Security: End To End Security
29 End-to-End: Communication Client (eg: browser) Server (eg: bank) Secure & Authenticated Communication
32 End-to-End: Quality Quality of Implementation in all things, at all levels Quality of Components
33 End-to-End: 4-D Security Quality of Implementation in all things, at all levels Application Application Integration Remote Access Authentication Client Antivirus Server Firewall Software Platform & OE Intrusion Detection Storage & Network, Other HW Physically Secure Apparently Confusing, but...
34 End-to-End: Simple 4-D Security Quality Integration Function Source Destination Function Foundation...actually rather simple.
35 When 2-D Drawings Fail... There is even a fifth, Human dimension to security, that which pertains to having correct People, Policy and Procedure - there are probably more.
36 Now consider: Does your security solution address all of these dimensions?
37 Better Security Through Better Design
38 Design Example: SSL
39 Design Example: Theory
40 Design Example: Oops!
41 Better Design
42 Solution? How do we address these challenges? Clever Network Design Bear risks in mind when laying-out architecture Build so that (some) problems never arise Clever Host Design Build computers so they are less-subject to attack Build computers for extra robustness Overall: apply Defence In Depth philosophy So, what is Defence in Depth?
43 The Philosophy of Defence In Depth
44 Defence in Depth Motto #1 Use multiple, independent, different, mutually-reinforcing security technologies Motto #2 Use whatever works, is manageable and available, and configure them sensibly and as simply as possible Motto #3 Employ a default-deny approach I.e., you can only access that which we publish
45 Defence in Depth Use of: Multiple Independent Different Mutually-Reinforcing...Security Technologies Not a 100% solution......but nothing is!
46 Defence in Depth Compare: Castle Defences Castle Video (6m33s)
48 Key Points Defence in Depth Use of different technologies with different failure modes Layers of security work to reduce profile available for attack You only see 10% of 10% of 10% of attacks... There may be loss of some auditing information between layers, but... Are you doing security research, or are you trying to defend yourself?
49 How Much Depth? When do I stop adding layers? Good question! Depends upon what you are trying to protect. Judgement call Personally, I reckon when all major risks have been mitigated twice, in different, independent ways, that's the minimum.
50 How robust is it? A very good approach to security......although it is not a 100% solution...its ablative shield approach yields better security than other monolithic solutions. You will never get 100% security, anyway. But things can still go wrong... For illustration...
51 If Implemented Well...
52 If Implemented Badly...
53 Extremes of Available Choice
54 Summary Defence in Depth Is a 7000-year-old approach to security that works really well Avoids monolithic security issues and monoculture syndrome Easy / inexpensive to build, but requires conscientious management and some forethought. Investment in this methodology will last for a long time
55 Summary Security requires continual investment Why audit, if you never read the logs? Why have intrusion detection, if you don't want to wake up at 0300h? Together, these yield budget justification! Why implement security, and yet fail to check its continued effectiveness over time? Healthchecks will yield ROI figures! Why protect, if you do not value?
56 Truisms Security is not a product......it is a process!...or, personally speaking: Security is not a process......it is a lifestyle!
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