dr. bhavani thuraisingham the university of texas at dallas (utd) june 2015 operations security

Dr. Bhavani ThuraisinghamThe University of Texas at Dallas (UTD)

June 2015

Operations Security

Domain Objectives• Protection and Control of Data Processing Resources

– Media Management– Backups and Recovery– Change Control

• Privileged Entity Control

Control Categories• Preventive• Detective• Corrective• Deterrent• Recovery• Directive• Compensating

Application-related Controls• Transaction• Input• Processing• Output• Test• Supervision / balancing• Job-flow• Logging• Licensing

Operations Security Focus Areas• Auditors• Support staff• Vendors• Security• Programmers• Operators• Engineers• Administrators

Domain Agenda• Resource Protection• Continuity of Operations• Change Control Management• Privileged Entity Control

Facility Support Systems• The support systems in centralized and decentralized operation

centers must be protected– Hardware– Software– Storage media– Cabling– Physical security

Facility Support Systems (cont.)• Fire protection• HVAC• Electrical power goals

Facility Support Systems (cont.)• Water• Communications• Alarm systems

Media Management• Storage• Encryption• Retrieval• Disposal

Object Reuse• Securely reassigned• Disclosure• Contamination• Recoverability

Clearing of Magnetic Media• Overwriting• Degaussing• Physical destruction

Media Management Practices• Sensitive Media Controls

– Destroying– Marking– Labeling– Handling– Storing– Declassifying

Misuse Prevention

Threats Countermeasures

Personal use Acceptable use policy, workstation controls, web content filtering, email filtering

Theft of media Appropriate media controls

Fraud Balancing of input/output reports, separation of duties, verification of information

Sniffers Encryption

Records Management• Consideration for records management program development• Guidelines for developing a records management program• Records retention

Domain Agenda• Resource Protection• Continuity of Operations• Change Control Management• Privileged Entity Control

Adequate Software & Data Backup• Operations controls ensure adequate backups of:

– Data– Operating systems– Applications– Transactions– Configurations– Reports

• Backups must be tested• Alternate site recovery plan

Fault Tolerance• Hardware failure is planned for• System recognizes a failure• Automatic corrective action• Standby systems

– Cold – configured, not on, lost connections– Warm – On, some lost data or transactions (TRX)– Hot – ready – failover

RAID – Redundant Array of Independent Discs

• Hardware-based• Software-based• Hot spare

RAID Level 0• Two or more disks• No redundancy• Performance only

RAID Level 1• Exact copy (or mirror)• Two or more disks• Fault tolerant• 200% cost

RAID Level 2• Striping of data with error correcting codes (ECC)• Requires more disks than RAID 3/4/5• Not used, not commercially viable

RAID Level 3• Byte level stripes• 1 drive for parity• All other drives are for data

RAID Level 4• Block level stripes• 1 drive for parity• All other drives are for data

RAID Level 5• Block level stripes• Data and parity interleaved amongst all drives• The most popular RAID implementation

RAID Level 6• Block level stripes• All drives used for data AND parity• 2 parity types• Higher cost• More fault tolerant than RAID implementations 2 - 5

RAID Level 0+1• Mirroring and striping• Higher cost• Higher speed

RAID Level 10• Mirroring and striping• Higher cost• Higher speed

Redundant Array of Independent Taps (RAIT)

• Using tapes not disk• Rea-time mirroring

Hot Spares• Waiting for disaster• Global• Dedicated

Backup Types• File image• System image• Data mirroring• Electronic vaulting• Remote journaling• Database shadowing• Redundant servers• Standby services

System Recovery – Trusted Recovery• Correct implementation• Failures don’t compromise a system’s secure operation

Types of Trusted Recovery• System reboot• Emergency system restart• System cold start

Fail Secure• Cause little or no harm to personnel• System remains secure

Operational Incident Handling• First line of defense• Logging, tracking and analysis of incidents• Escalation and notification

Incident Response TeamBenefits

• Protection of assets• Profitability• Regulations• Avoiding downstream

damage• Limit exposure

Priorities• Life safety• Labeled data• Communication• Reduce disruption

Contingency Plans• Business continuity plans and procedures

– Power failure– System failure– Denial of service– Intrusions– Tampering– Communication– Production delay– I/O errors

Domain Agenda• Resource Protection• Continuity of Operations• Change Control Management• Privileged Entity Control

Change Control Management• Business and technology balance• Defines

– Process of changes– Ownership of changes

• Changes are reviewed for impact on security

Change Control Committee Responsibilities

Management• Business impact• Regulations• Risk management• Approval• Accreditation

Technical• Request process• Functional impact• Access control• Testing• Rollback• Certification

Change Control Procedures• Request• Impact assessment• Approval• Build/test• Implement• Monitor

Configuration Management Elements• Hardware inventory• Hardware configuration chart• Software• Firmware• Documentation requirements• Testing

Patch Management• Knowledge of patches• Testing• Deployment• Zero-day challenges

Protection of Operational Files• Library Maintenance

– Backups– Source code– Object code– Configuration files

• Librarian

Domain Agenda• Resource Protection• Continuity of Operations• Change Control Management• Privileged Entity Control

Operator Privileges• Data input and output• Data maintenance• Labeling• Inventory

Administrator Privileges• Systems administrators• Network administrators• Audit highly-privileged accounts

Security Administrator Privileges• Security administration include:

– Policy• Development• Implementation• Maintenance and compliance

– Vulnerability assessments– Incident response

Control Over Privileged Entities• Review of access rights• Supervision• Monitoring/audit

Domain Summary• Resource Protection• Continuity of Operations• Change Control Management• Privileged Entity Control