cybersecurity Flashcards
(143 cards)
1
Q
Remember that before any assessment
A
you should define the scope of the project. the scope include what is included in the assessment
2
Q
In the scope always remember to
What are the four parts in defining the scope?
A
- Identify Requirement
- Specify which devices are involved.
- select method of collecting data.
- documentation.
3
Q
Key Component of Project scope include
A
- System description
- System architecture diagram
- network Diagram
- Asset inventory
- criticality assessment
- Documentation of data flow.
Remember! complete and detailed scope leads to more valuable assessment.
4
Q
Why conduct CVA
A
CVA meant to identify, classify, and define security Vulnerabilities. this is very critical step into in evaluating CYBER RISK!
5
Q
CVA includes
A
- Critical step into evaluating cyber risk!
-Evaluating the IACS design, implementation, configuration, implementation, and management, - Determine the adequacy of security measure and identify deficiencies.
6
Q
When selecting an assessment type
A
Be aware of cost and Risk to the system. Also consider the benefits gained when running assessment.
7
Q
Remember that
Those are Cybersecurity Vulnerability Assessment types
A
- Gap assessment least invasive and provide and it provide comparison to standards, it involves interviews, peers, site walk.
- Passive is used for reviewing arp tables, packet captures,
- Active uses tools to scan network and ports.
- Pen test include it exploit known and unknown vuln.
8
Q
Benefit of cyber security risk assessment
A
- Determine order of priority and what needs to be processed first.
- Define threats, Vulnerability and consequences, - this is time consuming and it involves subject natter experts. this will help us to determine countermeasures.
- Design and apply counter countermeasures to reduce risk.
- prioritize of activity and resources.
- evaluate countermeasure for effectiveness vs complexity.
- ROI is also important. is the Assessment worth our time?
9
Q
Cybersecurity Risk assessment process 62443-3-2
A
- System under consideration. Section 4.1
- High level risk assessment Section 4.2 * Involve safety teams. * this level will determine the Security Level target where you want to be.
- partition into zones and conduits Section 4.3
- perform detailed risk assessment for each zone and conduit Section 5.0
- Document Security Requirement Assumption. * CRS document. Section 4.4
10
Q
Detailed risk assessment process. Section 5.0 under IEC62443-3-2
A
as per the standard it is defined under section 5-
the standard explain the input which is the requirement for each zone and conduit. the middle is the requirement and the output is the results.
the list is
5.1 identify threat
5.2 identify vulnerabilities
5.3 determine consequences and impact.
5.4 determine likelihood.
5.5 calculate unmitigated cyber security risk
5.6 determine security level target.
5.7 consider exaiting countermeasures,
5.8 reevaluate likelihood and impact
5.9 calculate residual risk
5.10 all risk mitigated or below tolerable risk.
5.11 apply additional cybersecurity measure.
5.12 document results
11
Q
Documentation
A
You need to document to prove what you did.
Document should be:
- Revised,
- Amended,
- Reviewed and,
- Approved.
Document should be under controlled Scheme.
12
Q
You need to document all the reports. Documents include
Documents in general provide support, findings, and recommendations.
A
- Gap assessment reports
- Vulnerability reports
- Risk assessment Reports.
- Zone and conduit diagrams.
- CRS document.
13
Q
Difference between Vulnerability Assessment and Penetration Testing
A
VA include identify, classify, and define weaknesses and report on discoveries.
PEN test include exploit to gain access.
14
Q
Which key concept in the scope details all the element of the system?
A
Asset Inventory
15
Q
Why partition the system under consideration into zones and conduits?
A
To ensure best possible protection.
16
Q
Chapter 2 Conceptual Design
@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
A
@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
- Learn about the CRRF
- Identify the four T’s of managing risk
- Explain the 5 D’s of treating risk?
- Explain the elements of developing a security strategy
- Develop Cyber security plan.
17
Q
Conceptual Design have key components that needs to be address so you can provide conceptual design specifications. those key components are
A
1 - Interpret risk assessment results.
2 - Mitigate results 4Ts or mitigating risk using the 4T’s
3 - Treat Risk using the 5Ds
4 - Develop Security Strategy
5 - Prepare conceptual design specification.
Lets dive to each one.
18
Q
1- Interpreting Risk assessment Results- this includes. this should be included in any good risk risk assessment. if those are addressed correctly in the Risk assessment then things will be easier.
A
- Risk Profile
- Highest Severity Consequences.
- Threat/Vuln leading to the highest risk. * This step require a lot of research.
- Target Security Levels.
Recommendation.
SL-T should be established for each zone. this depends on CRRF. it is based on risk matrix and risk tolerance.
19
Q
Risk Profile is?
A
it is like a heat map that shows unmittigated risk and the risk level. some companies may have this in place or needs to build one.
20
Q
SL-T is defined in how many levels?
A
5 levels.
Level 0 - no requirement
Level 1 - Protection against casual
Level 2 - Protection against intentional with low resource
Level 3 - Protection again intentional with high skills and moderate skills
Level 4 - Protection against intentional attacks with high skills and high motivation.
21
Q
Security Level Target (SL-T) should be provided for each zone and conduit. also remember that
A
SL-T depends directly on CRRF the risk reduction Factor.
22
Q
CRRF
A
is a measure of the degree of acceptable level. or the risk reduction required to achieve tolerable risk.
CRRF = to unmitigated risk / tolerable risk
23
Q
You need to establish a relation between the SLT- and the CRRF. this should be based upon
A
Organization Risk Matrix and Risk tolerance.
24
Q
Security Level targets are explained under
A
Annex A of IEC62443-3-3 Security Level Vectors.
25
2- step 2 in the design phase is managing risk. this can be divided using the?
Four T's which include
- Tolerate Risk - Accept Risk
- Transfer Risk - Insurance 3rd party
- Terminate Risk -
- Treat Risk- reduce it to acceptable level by implementing countermeasure.
26
3- step 3 of the design is treating the risk 5Ds
used in neuclar wopeon and air forces.
TTLNF
- Deter - is the farthest from assets such as camera fence.
- Detect - cameras, security personnel.
- Delay - honey pot, locks to delay attacks
- Deny
- Defeat - security personal response to apprehend
27
Deter
objective is to deter attackers from attempting to breach
28
detect
objective to monitor large area to accurately detect unauthorized access and respond on time .
29
Delay
The objective of delay an active intrusion to force intruder to stop and allow security to respond
30
Deny
is keep unauthorized person out and let authorized people in
31
Defeat
Objective is to defeat intrusion by apprehending intruder. often involve law enforcement.
32
There is always differences between physical and cybersecurity policies. IEC62443-2-1 recommend that:
You need security policies and procedures established for both physical and cyber.
at least one or more physical security perimeters shall be in place to protect assets.
33
when applying security protection using the 5D's remember
this should be done for each zone and conduit. it should also use
- risk assessment results
- target security level
- Cybersecurity requirment specifications. CRS
34
Deter options are
- Policies and Procedures
- Warning Banners.
- Obscurity
35
Detect options are
- IDS
- SIEM
- Anti-Virus software
- Firewalls
- Emails and URL filtering
- Train personnel to be aware of scams
36
Delay attacks options are
- Security Hardening
- Patching
- Encryption
- Network segmentation
- Access Controls
- Honey Pot Systems.
37
Deny Options are
Deny unauthorized users and software's from access the system.
- Firewall
- Whitelisting
- Intrusion Prevention Systems
- Access Controls
38
Defeat the attackers. retain forensic evidence
eradicate the intruder or malicious software and restore the system to normal.
- Malware Removal tools
- Policies and Procedures
- Intrusion Prevention.
39
4- Develop a Security Strategy - remember the order.
- Identify Zones and conduits
- Review Risk assessment - this is for each zone and conduit.
- Establish Target security Level
- Identify Physical and cyber access points.
- Develop 5D physical and cyber strategy for each zone and conduit.
40
5- prepare conceptual design specification
this can include:
- Document security countermeasure to achieve target security level
- Scope of work
- conceptual system architecture
- budget cost and schedule estimate.
41
Chapter 3
@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
This chapter is focused on
- Project Management related to design
- System and Software Development Life Cycle
- Function and Security Requirement for the Design.
- Choose technology for the Design
-
42
design and implementation of countermeasure should always treated as
-Should be treated as a project
- Project Management is required
- With proper lifecycle, plan, and implement phase.
- Should always assign a project manager
43
what are some of the elements for good project plan?
- Clear goal of the Project
- Define the scope of work - Beware of scope creep
- list all deliverable to assign resources correctly
- quality criteria - and setting expectation
- determine stakeholders and get them involved and updated.
- Understand the budget for the project.
- establish milestone to keep project manageable.
- tolerance should be set for each milestone.
- address dependencies
- identify risk
- Schedule
- Dependencies
44
Software Process
is a set of related activities that leads to the production of software product.
45
System/Software Lifecycle
Software specification ( requirement analysis)
Software Design
software implementation - Coding
software validation - Testing
software evaluation - Maintenance and Further Development
46
the phase necessary to develop and maintain software system are called
Data Structure.
47
Security Requirement
You must secure you security countermeasures.
48
Normally security countermeasures are installed with?
insufficient Security - example.
- IP camera with default
- firewall with telnet enabled.
- servers with weak and not security in place .
49
Countermeasures details include
- Environment
- User Characteristic
- Assumption
- Constrains
- Dependencies
50
Countermeasure Requirement include
- Functional
- Usability
- performance
- Data Management
- Standards
- Security
51
Security requirement is divided into - cyber security requirement specification
- Environmental/ External Dependencies such as - supply chain - testing - protection and health and safety
- Risk Assessment and control requirement.
- Regulatory and Industrial standard requirement
- Access Control requirement
Data integrity and Confidential Requirement
- Communication and Data flow requirement
- security event monitoring tools
52
each security requirement there is a set of one or more design element that will be produced. those elements includes
- Architecture Diagrams.
- Data flow charts
- Design Specification
- Use Cases
- Business Process Diagrams.
- Configuration Screens.
53
Elements of good DESIGN SPECIFICATION include
- Introduction
- Project Scope
- System Design
- Component and process Design
- Data Design
- User Display and output.
- Reports
- System Files.
- Prototype description
- prototype test procedure. analysis.
- Special notes
- Project Extension.
54
Good element of project management
- Goal of project
- Scope of work
- Deliverable
-Quality criteria
- Stakeholder.
- Budget.
- Schedule
- Risk
- Tolerance
- Milestone
- Task/duties/ responsibilities.
55
what is Firewall?
@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
device or hardware/software controls the flow of traffic between network devices. Firewall filter communications allow authorized and deny unauthorized.
@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
56
firewall type are divided into two types
Network Based hardware
Host Based software
57
Network Firewall are typically
Hardware appliance that filter traffic between one or more devices.
58
Threat modeling firewall
it is more than firewall and they do more than just checking inbound and outbound.
59
Classes of network firewalls are
- Packet filter
- Stateful Inspection firewall
- Deep packet inspection
60
To have good defense in depth strategy you will need to add to network firewall.
adding Host based firewall will provide defense in depth approach. normally those firewalls are software based and they reside in the host they are protecting. PROVIDE GRANULAR PROTECTION...
61
Host BASED FIREWALLS
- Part of the operation system
- they perform logging.
- Limit outbound traffic to prevent infection.
- can be configured to perform - Addresses based and application based inspection.
- Act as Intrusion Prevention System - detect attack and take action to thwart.
62
Personal firewalls (Host based)
- provide extra protection.
- they reside on the host they are protecting.
- monitor incoming/outgoing network traffic.
-
63
Packet filter
the basic model of all
- based on source/Des mac and IP address.
- based on states of flag - SYNC- FIN - ACK - INIATED- CLOSED - ESTABLISHED
- it is the core and can be found in routers and it is called ACCESS LIST
- based on directives.
- it doesn't not care about content - PAYLOAD not important.
64
Statuful INSEPCTION
track the states of the packet and block packets that deviate from the state.
it does that inspection by evaluate the TCP values.
- those firewall check the status and port number.
firewalls normally check the TCP sequence number to reject not legit traffic.
- If you have nat- the rule set first checked then 3 hand-shake is completed.
65
stateful major states are
- Connection establish
- termination
- USAGE
66
Deep packet inspection?
it adds basic intrusion detection technology that analyze protocols to IDENTIFY MALESIOUS CODES and MALFORMED PACKETS
it can allow. deny based on specific attribute.
IT CAN BLOCK FUNCTIONS based on protocol function 9 for example write code tcp Modbus)
it can also block .exe
67
different types of inspections
Switch filter only to the MAC address
Firewall packet filter based on MAC and IP address
Packet filter uses MAC and IP and also Session. TCP/UPD
Deep packet inspection add to that the Applications and payload.
68
as per IEC 62443 - 2-1
you should never connect corporate network to control system. there must be a firewall to have defense in depth.
69
DMZ
it is recommended to have DMZ in the network to act as a buffer between the Control System and the Enterprise.
70
Defense in Depth firewall architecture
you should always have one firewall for each main controller. so that when a layer gets compromised the other firewall will protect it.
71
Firewall Planning and Implementation phases
- Plan identifying all requirement to select the product.
- Install and Configure this includes installing configuring and firewall rules.
- Test test configuration to validate functionality, performance, scalability.
- Deploy - deploy firewalls.
- Manage -
72
In the plan phase
you should think about the architecture. future expansion, technology used, so many much more.
73
in the install and configure phase
think about install - device, software, hardware, patch update.
think about configure user/account - policy/rule/ access list/ comments changes,
think about greenfield installations.
policy is very important for firewall implementation in this phase. and CRTICIAL .
74
third phase is the test phase
test connectivity, rule sets, application, logging, performance, features like vpn
75
the fourth phase is
Deploy - notify parties when making change, have change management plan, backup, plan .,
76
Fifth phase
manage this include maintaining policies, patching, review logs, audit, management,
77
Intrusion Detection module
@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
78
Intrusion detection systems are used?
to detect unattempted to break to the system. the allow admins to respond to minor security issues before they became security incidents
79
IDS types are
NIDS and HIDS
80
the two methods of IDS are
-Anomaly is based on behavior
- pre defined rules based on signatures
81
IDs system can be inline or out of band.
in general it does not block traffic. also it is normally places in strategic place to monitor all traffic
- Out of band meaning they get the information from port mirror
- Inline meaning its part of the network and traffic passes through it.
82
Host intrusion detection
is meant to detect single host. its normally an agent installed in the host machines. it will detect and use the pop up screen, sometimes it send to the central collector.
83
abilities for HIDS includes:
- Log analysis
- Event coloration
- Integrity checking
- Policy enforcement
- Rootkit detection
- Alerting.
84
NIDS in comparison to HIDS
they have
- broad scope where HIDs have narrower scope
- near real time response - respond right away
- bandwidth depend - HIDS not much traffic requirement
- high false positive rate where HIDS is low false positive
- required hardware where HIDS does not require hardware.
85
IDS installation best practices
- Using distributed deployment strategy.
- Install NIDS at zone entry points.
always enhance those implementation with SCADA signatures.
86
WHAT IS SYSTEM HARDENING
@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
process of securing systems by reducing their surface attack. Reducing the attack surface!!!
@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
87
System hardening surface attack includes:
Reduce the vector attack by doing the following..
HOW TO REDUCE THE ATTACK SURFACE???
- Remove unnessassry softwares only install what you need.
- remove unneeded user accounts. no need to add user accounts.
- Strengthen access control - dont use the default
- disable unneeded services. do not enable all services.
- install security patches. - patches comes with security enhancement. use them!
88
what device can be hardened
Basically any configurable device can be hardened. PLC, VDF, switches, gateways, PLC, software
89
Operation system hardening guides can be found?
REMEMBER IN HARDENING WE ALWAYS REFER TO CIS and DISA STIGs.
- NIST SP800-123
- Microsoft security guide
- CIS security benchmark
- DISA STIGs - defense information system Agency security technical implementation guide.
90
Basic steps to secure an operation system include
- Patches to update OS - patches comes with secure enhancement.
- Remove and disable services. - services not required always.
- Configure access control - least privilege - only allow what you need.
- Configure user os authentication - Authentication should always be enabled.
- Install additional security controls. - make sure you include everything.
- Test the security of OS - check the OS system.
91
CIS security configuration benchmark
Recommendation for technical controls created by lots of professionals.
- accepted by governments.
- used by IT professionals.
- DE FACTO
basically CIS security have benchmarks for all the different systems.
92
it is recommended to use automated policies
because its extremely difficult to manage those manually.
93
some of the tools to automate policy are
- Active Directory
- Microsoft Windows Security Compliance Manager
- DISA - Defense Information System Security.
94
MICROSOFT SECURITY COMPLIANCE MANAGER - SCM
it is free tool that have the benchmark of the best practice confguration.
- ready to deploy and test and test policies.
- import configuration from active directory and backup local group policy.
95
SCM was replaced by
security compliance toolkit in june 2017
96
SCM
- Gold master support - pre build to save time.
- configure standalone machines.
- update security guides.
- compare to industry best practice.
97
EMET
ENHANCED MITIGATION EXPERIENCE TOOLKIT
98
EMET is?
is an enhancement to windows operation system that stops broad classes of malware from executing.
99
EMET IN GENERAL
provide addtional protection to vulnrabile un-patched software.
- require little configuration and maintenance.
- offer centralized admin and logging.
- Audit only" mode for compatibility testing.
100
EMET MITIGATION types are
- System wide
- Application specifics.
- Advanced.
101
EMET SYSTEM WIDE INCLUDES:
- Data execution prevention: this prevent damage and virus to your computer. some attacks uses memory and this will prevent it.
- Address Space Layout Randomization. ASLR this prevent shellcode from execution, it does this by offset location in memory.
- Structured Exception Handler Overwrites (SEHOP) guard against stack overflows by using code 32bit to prevent attacks.
102
EMET APPLICATION SPECIFIC INCLUDES:
HEAP Spray arbitrary code execution. taking advantage of the heap.
EAF - Export Address table Access filtering.
103
EMET Advanced includes:
- Deep Hooks - provide protections for critical APIs and low level APIs. used by top level.
- ANTI DETOURS - Shellcode techniques for evasion of hooks by execution. -
- Banned function - is for additional APIs blocked and detected.
104
mitigation for emet are as follows
System Wide Mitigation - DEP, ASLR, SEHOP
Advanced Mitigation - Deep hooks, Anti Detours, Banned function.
Application - everything else including HEAP and EFR.
105
Device hardening
sometimes the devices are PLC, HMI, MOTOR, Driver,
always check with NISA, ISA, Vendors might have some hardening procedures for their devices.
106
Device hardening best practise include
- Disable remote device changes.
- install vendor firmware
- check with hash always.
- shutdown unused interfaces.
- disable unused protocols.
-enable logging.
- disable services.
- restrict remote access.
- protect IACS with industrial firewall.
- change default passwords.
107
Network hardening
- You should always look into the network and not only end devices.
examples are firewalls, routers, switches, etc.
108
the network is divided into three functional planes.
- Management - manage traffic send to IOS. such as application, ssh, protocol, SNMP
- Control - maintain things like OSPF, PGP, paramount to the network.
- Data - forward traffic through the network.
109
Network Hardening Best practice include
- Install firmware update.
- compare hashes
- shutdown unused physical interfaces.
- enable logging
- shutdown unneeded services.
- restrict remote management
- use SNMP3
- change and encrypt passwords.
110
what is access control
@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
it is basically controlling the access ... this is basically all the policies and procedures and technical controls that govern the use of system resource.
@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
111
access control
ensures system is only accessable by authorized users. accounts, processes.
112
ACCESS CONTROL involves with
ESTABLISHING
ACTIVATING
Modifying
Reviewing
Disabling
Removing accounts.
113
ACCESS CONTROL also enforce issues such as
- Separation of duties
- Least privilege
- Unsuccessful login attempts
- System use notification
- Session locking
- Session termination
Concurrent session control
114
what devices in IACS require access control. almost everything in IACS.
- Servers/ workstation operation system
- Application HMI Engineering
- Data bases
- Network Components
- and most devices.
115
guidence for Access control include
- ISA/IEC 62443-2-1 establisihing
ISA/IEC 62443-3-2 security requirement
- NIST 800.53 security and privacy for federal
- NIST 800-82 guide to industrial control system
- public safety canada TR12-002
- US department of homland security.
116
Access control bast practice guidance
- Develop an access control policy to logical and physical rules. you decide how granular it can be.
- Employ multiple authentication methods
- Segregate data with high sensitivity and business consequence from other
- Make use of central identity and access.
- Establish separates IACS domains.
- Use organization OU to partition resources and functional units.
-
117
always use two factor authentication to determine authenticity
something you know - password and pin
something you have card, token usb
and somewhere you are - fingerpring and retinal signtures.
118
technology made it so easy to have access to systems.
- LAN WAN TCP
- mODEM OVER PUBLIC telephone service
- modem to non windows devices.
this come with good benefits to oiperation but huge risk since people can access it.
119
Challenges in designing remote access controls
-large variety of control system architectures.
- different type of needs for remote users.
- technology limitation
- service limitation
- different IT policies.
- regulatory limitation
- vendor requirement.
120
guidance for remote access - Vendors always the best to reach...
- Center of protection of national infrastructure.
- North American electrical reliability corporation (NERC)
- public safety of Canada.
121
typical remote users include
- maintenance
- operators
- system support.
- business partners.
- supply chain
- field technician
- customers.
- service providers.
122
remote access technologies include
- telephone services. POTS ISDN and Dialup
- Wireless such as settalite 802.11, mocrowave, 900
- WAN such as T1 E1, DSL, framerelay, ATM, MPLS
- remote access servers such as my pc, log me in, teamviewer,.
- VPN
- terminal services.
- desktop virtualization citrix,
123
Design factors related to designing remote services.
the list is long but here are the main ones.
- type and quantity of users requiring access.
- IACS assets that require access
- threats and possible attack vectors.
- SL-T for each accessible remote asset.
- regulatory and policy restriction
- technology and vendor restriction.
- budget.
- Available services.
- duration of remote access.
124
VPN is
a network device equipped with enhanced security features knows as SSL Secure Socket layer.
125
is commonly used protocol for secure messaging.
SSL Secure Socket Layer.
126
VPN they cannot detect malicious code,
also VPN does not limit the ptotocols.
127
VPN employ the following for security
IPSec internet protocol security
SSL/TLS Secure socket layer/ transport layer security
DTLS - Datagram Transport Layer Security
MPPE - Microsoft point to point encryption
SSTP - Secure Socket tunneling protocol.
128
Site to Site VPN
Two endpoints of a VPN are intermediary devices that passes traffic from trusted network to another trusted network using untrusted link.
129
Remote access VPN
it has a host computing device at one point and the other point is intermediate device - for protection, always add VPN gateway with DMZ.
130
Unified Threat Management
it is the evolution for of the traditional firewalls. it comes with so many enhancement and different VPN technology.
131
remote VPN best practice
- Only approved laptop for remote access.
- provide secure bootable images.
- require and enforce 3rd party with remote access.
- provide separate authentication mechanism for internal and external.
- change port number to different port numbers.
-
132
remote access best practice.
- disable split tunnel in the VPN
- Monitor and log ID, Time,
- provide mechanism for on demand access and termination.
- restrict access to special machines.
-force vpn traffic after a firewall and IDS after its unencrypted.
133
examples of secure remote access
- only read access when possible.
- limit data exchange with seplaier and customers.
- employee and vendor remote maintenance.
- FULL ACCESS IS business decision that needs to be addressed by management. IT IS NOT RECOMMENDED FOR REMOTE ACCESS in IACS.
134
Cybersecurity Acceptance Test
@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
135
CFAT AND CSAT
FAT at the vendor location
SAT at the customer location before going live. and before functional test.
136
Cybersecurity Acceptance testing Objective are
First: Verification of Cybersecurity Specifications.
Second: Cybersecurity Robustness Testing.
137
Robustness testing involves testing the
Weaknesses of the system. basically try to break into it.
138
Verification of Cybersecurity Specification
this step is to verify that specification and policies are met with the operation of the system.
139
Site acceptance testing guidenses are
- ISA/IEC62443-2-4
- ISA secure
- DHS
140
cybersecurity acceptance test best practice
- Select different vendors for testing than the designers.
- Define system under test
- Develop a verification and test plan
- Verify cybersecurity configuration settings.
- Perform robustness settings
- Document the results.
141
security audit tools are
CAT configuration Assessment tool. - benchmark the configuration of the system to the CIS benchmark.
RAT is Router assessment tool - this tool assess routers/ configuration Cisco.
NESSUS- Audit operation systems.
142
Defense in Depth Firewall architecture
you should always have one firewall for each main controller. so that when a layer gets compromised the other firewall will protect it.
143
In The Plan Phase
You should think about the architecture. future expansion, technology used, so many much more.
