10 KiB
10 KiB
SMOA Threat Model
Version: 1.0
Last Updated: 2024-12-20
Status: Draft - In Progress
Classification: Internal Use
Threat Model Overview
Methodology
This threat model follows STRIDE methodology:
- Spoofing
- Tampering
- Repudiation
- Information Disclosure
- Denial of Service
- Elevation of Privilege
System Boundaries
- Application: SMOA Android application
- Device: Foldable Android device
- Network: Secure government networks
- Backend Services: Enterprise backend services (if applicable)
- External Systems: AS4 gateway, NCIC, ATF, QTSP
Trust Boundaries
- Device Boundary: Trust boundary between device and network
- Application Boundary: Trust boundary between application and OS
- User Boundary: Trust boundary between user and application
- Network Boundary: Trust boundary between device and backend
Threat Identification
Authentication Threats
T-AUTH-001: PIN Guessing
- Threat: Attacker guesses user PIN
- Likelihood: Medium
- Impact: High
- Mitigation:
- PIN complexity requirements
- Retry limits and lockout
- Rate limiting
- Status: ✅ Mitigated
T-AUTH-002: Biometric Spoofing
- Threat: Attacker spoofs biometric authentication
- Likelihood: Low
- Impact: High
- Mitigation:
- Hardware-backed biometrics
- Liveness detection
- Anti-spoofing measures
- Status: ✅ Mitigated
T-AUTH-003: Session Hijacking
- Threat: Attacker hijacks user session
- Likelihood: Low
- Impact: High
- Mitigation:
- Secure session tokens
- Session timeout
- Re-authentication requirements
- Status: ✅ Mitigated
Authorization Threats
T-AUTHZ-001: Privilege Escalation
- Threat: Attacker gains unauthorized privileges
- Likelihood: Low
- Impact: High
- Mitigation:
- Role-based access control
- Principle of least privilege
- Permission validation
- Status: ✅ Mitigated
T-AUTHZ-002: Unauthorized Access
- Threat: Attacker accesses unauthorized data
- Likelihood: Medium
- Impact: High
- Mitigation:
- Access control enforcement
- Data classification
- Audit logging
- Status: ✅ Mitigated
Data Protection Threats
T-DATA-001: Data Theft
- Threat: Attacker steals sensitive data
- Likelihood: Medium
- Impact: High
- Mitigation:
- Encryption at rest
- Encryption in transit
- Access controls
- Status: ✅ Mitigated
T-DATA-002: Data Tampering
- Threat: Attacker modifies data
- Likelihood: Low
- Impact: High
- Mitigation:
- Data integrity checks
- Digital signatures
- Audit logging
- Status: ✅ Mitigated
T-DATA-003: Data Leakage
- Threat: Sensitive data leaked
- Likelihood: Medium
- Impact: High
- Mitigation:
- Data classification
- Access controls
- Monitoring
- Status: ✅ Mitigated
Network Threats
T-NET-001: Man-in-the-Middle
- Threat: Attacker intercepts network traffic
- Likelihood: Low
- Impact: High
- Mitigation:
- TLS encryption
- Certificate pinning
- Mutual authentication
- Status: ✅ Mitigated
T-NET-002: Network Eavesdropping
- Threat: Attacker eavesdrops on network traffic
- Likelihood: Low
- Impact: Medium
- Mitigation:
- TLS encryption
- VPN requirements
- Network monitoring
- Status: ✅ Mitigated
T-NET-003: Denial of Service
- Threat: Attacker causes service unavailability
- Likelihood: Low
- Impact: Medium
- Mitigation:
- Offline operation capability
- Rate limiting
- Resource management
- Status: ✅ Mitigated
Device Threats
T-DEV-001: Device Theft
- Threat: Attacker steals device
- Likelihood: Medium
- Impact: High
- Mitigation:
- Device encryption
- Remote wipe capability
- Strong authentication
- Status: ✅ Mitigated
T-DEV-002: Device Compromise
- Threat: Attacker compromises device
- Likelihood: Low
- Impact: High
- Mitigation:
- Device hardening
- Security monitoring
- Incident response
- Status: ⚠️ Partial
T-DEV-003: Malicious Apps
- Threat: Malicious apps compromise security
- Likelihood: Low
- Impact: Medium
- Mitigation:
- App isolation
- Permission restrictions
- Security scanning
- Status: ✅ Mitigated
Application Threats
T-APP-001: Code Injection
- Threat: Attacker injects malicious code
- Likelihood: Low
- Impact: High
- Mitigation:
- Input validation
- Secure coding practices
- Code review
- Status: ✅ Mitigated
T-APP-002: Reverse Engineering
- Threat: Attacker reverse engineers application
- Likelihood: Medium
- Impact: Medium
- Mitigation:
- Code obfuscation
- Anti-tampering measures
- Secure key storage
- Status: ⚠️ Partial
T-APP-003: Side-Channel Attacks
- Threat: Attacker uses side-channel information
- Likelihood: Low
- Impact: Medium
- Mitigation:
- Constant-time operations
- Secure memory handling
- Timing attack protection
- Status: ⚠️ Partial
Threat Analysis
Threat Likelihood Assessment
| Threat | Likelihood | Rationale |
|---|---|---|
| PIN Guessing | Medium | PINs can be guessed with sufficient attempts |
| Biometric Spoofing | Low | Hardware-backed biometrics with liveness detection |
| Session Hijacking | Low | Secure session management |
| Privilege Escalation | Low | Strong RBAC enforcement |
| Data Theft | Medium | Device theft is possible |
| Data Tampering | Low | Integrity checks and signatures |
| Man-in-the-Middle | Low | TLS and certificate pinning |
| Device Theft | Medium | Physical device theft possible |
| Code Injection | Low | Input validation and secure coding |
| Reverse Engineering | Medium | Application can be analyzed |
Threat Impact Assessment
| Threat | Impact | Rationale |
|---|---|---|
| Authentication Bypass | High | Complete system compromise |
| Data Theft | High | Sensitive data exposure |
| Data Tampering | High | Data integrity compromise |
| Privilege Escalation | High | Unauthorized access |
| Network Interception | High | Communication compromise |
| Device Compromise | High | Complete device control |
| Service Disruption | Medium | Operational impact |
Risk Assessment
| Threat | Likelihood | Impact | Risk Level | Priority |
|---|---|---|---|---|
| T-AUTH-001: PIN Guessing | Medium | High | High | P1 |
| T-AUTH-002: Biometric Spoofing | Low | High | Medium | P2 |
| T-AUTH-003: Session Hijacking | Low | High | Medium | P2 |
| T-AUTHZ-001: Privilege Escalation | Low | High | Medium | P1 |
| T-DATA-001: Data Theft | Medium | High | High | P1 |
| T-DATA-002: Data Tampering | Low | High | Medium | P1 |
| T-NET-001: Man-in-the-Middle | Low | High | Medium | P1 |
| T-DEV-001: Device Theft | Medium | High | High | P1 |
| T-APP-001: Code Injection | Low | High | Medium | P1 |
Mitigation Strategies
Authentication Mitigations
- ✅ Multi-factor authentication
- ✅ Hardware-backed biometrics
- ✅ PIN complexity and lockout
- ✅ Session management
- ✅ Re-authentication requirements
Authorization Mitigations
- ✅ Role-based access control
- ✅ Principle of least privilege
- ✅ Permission validation
- ✅ Access control enforcement
- ✅ Audit logging
Data Protection Mitigations
- ✅ Encryption at rest (AES-256-GCM)
- ✅ Encryption in transit (TLS 1.2+)
- ✅ Hardware-backed key storage
- ✅ Data integrity checks
- ✅ Digital signatures
Network Mitigations
- ✅ TLS encryption
- ✅ Certificate pinning
- ✅ VPN requirements
- ✅ Network monitoring
- ✅ Rate limiting
Device Mitigations
- ✅ Device encryption
- ✅ Remote wipe capability
- ✅ Device hardening
- ✅ Security monitoring
- ✅ MDM/UEM management
Application Mitigations
- ✅ Input validation
- ✅ Secure coding practices
- ✅ Code review
- ✅ Vulnerability scanning
- ⚠️ Code obfuscation (partial)
- ⚠️ Anti-tampering (partial)
Residual Risk
High Residual Risk
- Device Compromise: Physical access to compromised device
- Reverse Engineering: Application analysis and key extraction
- Side-Channel Attacks: Timing and power analysis attacks
Medium Residual Risk
- PIN Guessing: With sufficient time and access
- Data Theft: If device is stolen and authentication bypassed
Low Residual Risk
- Network Attacks: With TLS and VPN protection
- Code Injection: With input validation
- Session Hijacking: With secure session management
Threat Monitoring
Detection Capabilities
- Failed Authentication: Monitor authentication failures
- Unauthorized Access: Monitor access attempts
- Anomalous Behavior: Detect unusual patterns
- Security Violations: Detect policy violations
Response Procedures
- Automated Response: Automatic threat response
- Alert Generation: Security alert generation
- Incident Escalation: Escalation procedures
- Remediation: Threat remediation
Threat Model Maintenance
Review Schedule
- Quarterly Reviews: Review threat model quarterly
- After Major Changes: Review after architecture changes
- After Security Incidents: Review after security incidents
- Before Certification: Review before security certification
Update Procedures
- Identify new threats
- Assess threat likelihood and impact
- Update threat model
- Review mitigations
- Update documentation
References
- Security Architecture
- Security Configuration Guide
- Incident Response Plan
- Architecture Documentation
Document Owner: Security Architect
Last Updated: 2024-12-20
Status: Draft - In Progress
Classification: Internal Use
Next Review: 2024-12-27