# AgentExtension Security Controls Implementation Checklist

**Version**: 1.0  
**Date**: August 3, 2025  
**Status**: Implementation Required  

## Overview

This checklist provides detailed implementation guidance for the security controls identified in the AgentExtension Security Audit Report. Each control is categorized by priority and includes specific implementation steps, acceptance criteria, and validation methods.

## Priority 1: Critical Security Controls (Must Implement Before Production)

### ✅ SEC-001: Secure Validation Sandbox Environment

**Requirement**: Implement isolated container environment for extension validation

**Implementation Steps**:
- [ ] Deploy Docker/Podman containers with restricted capabilities
- [ ] Configure resource limits (CPU: 1 core, Memory: 512MB, Disk: 100MB)
- [ ] Implement network isolation with no external internet access
- [ ] Create read-only base filesystem with limited write access
- [ ] Deploy security monitoring within sandbox environment
- [ ] Implement automatic sandbox cleanup after validation

**Acceptance Criteria**:
- Extensions cannot access host filesystem outside designated areas
- Network access is completely restricted
- Resource consumption is limited and monitored
- Sandbox instances are ephemeral and automatically destroyed
- All sandbox activities are logged

**Validation Method**: Penetration testing of sandbox escape attempts

**Timeline**: 2 weeks  
**Owner**: Security Engineering Team  
**Dependencies**: Container infrastructure

---

### ✅ SEC-002: Static Application Security Testing (SAST)

**Requirement**: Deploy automated static code analysis for security vulnerabilities

**Implementation Steps**:
- [ ] Deploy SAST tools (SonarQube Security, Checkmarx, Veracode)
- [ ] Configure security rules for common vulnerability patterns
- [ ] Integrate with validation pipeline
- [ ] Create security finding categorization (Critical/High/Medium/Low)
- [ ] Implement automatic rejection for critical findings
- [ ] Create security finding reporting and remediation tracking

**Acceptance Criteria**:
- All extensions undergo automated security scanning
- Critical security findings block extension approval
- Security findings are categorized and documented
- False positive rate is below 10%
- Scan results are preserved for audit trail

**Validation Method**: Test with known vulnerable code samples

**Timeline**: 3 weeks  
**Owner**: Security Engineering Team  
**Dependencies**: SAST tool procurement

---

### ✅ SEC-003: Extension Cryptographic Signing Infrastructure

**Requirement**: Implement PKI infrastructure for extension integrity protection

**Implementation Steps**:
- [ ] Deploy Certificate Authority (CA) infrastructure
- [ ] Create extension signing certificate hierarchy
- [ ] Implement automated signing process for approved extensions
- [ ] Deploy signature verification at extension installation
- [ ] Create certificate lifecycle management procedures
- [ ] Implement certificate revocation capability

**Acceptance Criteria**:
- All extensions are cryptographically signed before publication
- Signature verification prevents unsigned extension installation
- Certificate management is automated and secure
- Certificate revocation is immediate and effective
- Key material is protected in HSM/secure enclave

**Validation Method**: Attempt installation of unsigned and tampered extensions

**Timeline**: 4 weeks  
**Owner**: Security Architecture Team  
**Dependencies**: PKI infrastructure, HSM procurement

---

### ✅ SEC-004: Emergency Extension Quarantine System

**Requirement**: Implement capability to rapidly disable malicious extensions

**Implementation Steps**:
- [ ] Create extension quarantine database
- [ ] Implement real-time extension disable mechanism
- [ ] Deploy quarantine status propagation to all agents
- [ ] Create emergency response procedures
- [ ] Implement automated quarantine triggers
- [ ] Create quarantine notification system

**Acceptance Criteria**:
- Extensions can be quarantined within 60 seconds
- Quarantine status propagates to all agents within 5 minutes
- Quarantined extensions are immediately disabled
- Emergency response team receives instant notifications
- Quarantine actions are logged and auditable

**Validation Method**: Simulate malicious extension detection and quarantine

**Timeline**: 2 weeks  
**Owner**: Platform Engineering Team  
**Dependencies**: Real-time messaging infrastructure

---

## Priority 2: High Priority Security Controls (Implement within 30 days)

### 🔧 SEC-005: Dependency Vulnerability Scanning

**Requirement**: Scan extension dependencies for known vulnerabilities

**Implementation Steps**:
- [ ] Deploy dependency scanning tools (Snyk, OWASP Dependency Check)
- [ ] Integrate with national vulnerability databases (NVD, CVE)
- [ ] Create dependency allowlist/blocklist system
- [ ] Implement recursive dependency tree analysis
- [ ] Create vulnerability severity scoring system
- [ ] Implement automated vulnerability reporting

**Acceptance Criteria**:
- All extension dependencies are scanned for vulnerabilities
- Critical/High vulnerabilities block extension approval
- Dependency tree is fully analyzed including transitive dependencies
- Vulnerability data is updated daily
- Scan results include remediation guidance

**Validation Method**: Test with extensions containing known vulnerable dependencies

**Timeline**: 3 weeks  
**Owner**: Security Engineering Team  
**Dependencies**: Vulnerability database access

---

### 🔧 SEC-006: Role-Based Access Control (RBAC) System

**Requirement**: Implement granular access controls for extension management

**Implementation Steps**:
- [ ] Design RBAC model for extension operations
- [ ] Implement user role management system
- [ ] Create permission matrix for extension operations
- [ ] Deploy multi-factor authentication for publishers
- [ ] Implement session management and timeout controls
- [ ] Create access audit logging

**Roles and Permissions**:
```
Extension Publisher:
- Submit extensions
- View own extensions
- Update own extension metadata

Extension Reviewer:
- Review submitted extensions
- Approve/reject extensions
- Request publisher modifications

Security Administrator:
- Quarantine extensions
- View security audit logs
- Manage security policies

Registry Administrator:
- Full system access
- User management
- System configuration
```

**Acceptance Criteria**:
- Users can only perform authorized actions
- All privileged operations require MFA
- Access attempts are logged and monitored
- Role assignments are auditable
- Session security is enforced

**Validation Method**: Attempt unauthorized operations from different user roles

**Timeline**: 4 weeks  
**Owner**: Identity Management Team  
**Dependencies**: Identity provider integration

---

### 🔧 SEC-007: Security Information and Event Management (SIEM)

**Requirement**: Deploy comprehensive security monitoring and alerting

**Implementation Steps**:
- [ ] Deploy SIEM platform (Splunk, Elastic Security, QRadar)
- [ ] Configure log collection from all system components
- [ ] Create security event correlation rules
- [ ] Implement anomaly detection algorithms
- [ ] Create security alert escalation procedures
- [ ] Deploy automated threat response workflows

**Security Events to Monitor**:
- Extension submission and validation events
- Authentication and authorization failures
- Privilege escalation attempts
- Suspicious extension behavior
- Resource usage anomalies
- Network communication patterns

**Acceptance Criteria**:
- All security-relevant events are collected and analyzed
- Critical alerts trigger immediate response
- Security events are retained for compliance requirements
- Threat detection accuracy is above 95%
- Mean time to detection (MTTD) is under 15 minutes

**Validation Method**: Simulate security incidents and measure detection/response times

**Timeline**: 6 weeks  
**Owner**: Security Operations Team  
**Dependencies**: SIEM platform procurement

---

## Priority 3: Medium Priority Security Controls (Implement within 60 days)

### 📋 SEC-008: Security Compliance Framework

**Requirement**: Establish comprehensive security compliance monitoring

**Implementation Steps**:
- [ ] Create security policies and procedures documentation
- [ ] Implement compliance monitoring tools
- [ ] Create audit trail capabilities
- [ ] Establish security metrics and KPIs
- [ ] Create compliance reporting dashboard
- [ ] Implement periodic security assessments

**Compliance Standards**:
- OWASP Top 10 for APIs
- NIST Cybersecurity Framework
- ISO 27001 Information Security Management
- CIS Critical Security Controls
- A2A Protocol Security Requirements

**Acceptance Criteria**:
- Security policies are documented and communicated
- Compliance status is continuously monitored
- Audit trails are complete and tamper-evident
- Security metrics are tracked and reported
- Compliance gaps are identified and remediated

**Validation Method**: External compliance audit

**Timeline**: 8 weeks  
**Owner**: Security Compliance Team  
**Dependencies**: Compliance management platform

---

### 📋 SEC-009: Advanced Threat Detection

**Requirement**: Deploy behavioral analysis and threat intelligence integration

**Implementation Steps**:
- [ ] Implement User and Entity Behavior Analytics (UEBA)
- [ ] Deploy machine learning anomaly detection
- [ ] Integrate threat intelligence feeds
- [ ] Create behavioral baselines for normal extension activity
- [ ] Implement adaptive threat scoring
- [ ] Deploy automated threat hunting capabilities

**Threat Detection Capabilities**:
- Anomalous extension behavior patterns
- Suspicious publisher activities
- Unknown malware signatures
- Advanced persistent threat (APT) indicators
- Zero-day exploit attempts
- Insider threat detection

**Acceptance Criteria**:
- Behavioral baselines are established and maintained
- Threat intelligence is current and actionable
- Machine learning models achieve >90% accuracy
- False positive rate is below 5%
- Threat hunting identifies unknown threats

**Validation Method**: Purple team exercises with advanced attack simulations

**Timeline**: 10 weeks  
**Owner**: Threat Intelligence Team  
**Dependencies**: ML platform, threat intelligence subscriptions

---

## Priority 4: Long-term Security Architecture (Implement within 90 days)

### 🏗️ SEC-010: Zero-Trust Architecture Implementation

**Requirement**: Deploy comprehensive zero-trust security model

**Implementation Steps**:
- [ ] Implement micro-segmentation for extension execution
- [ ] Deploy continuous verification mechanisms
- [ ] Create trust score-based access controls
- [ ] Implement device and workload attestation
- [ ] Deploy software-defined perimeter (SDP)
- [ ] Create adaptive authentication policies

**Zero-Trust Principles**:
- Never trust, always verify
- Assume breach mentality
- Verify explicitly
- Use least privilege access
- Secure all communications
- Continuous monitoring and validation

**Acceptance Criteria**:
- All network communications are encrypted and authenticated
- Trust decisions are made continuously
- Access is granted based on dynamic risk assessment
- Micro-segmentation limits blast radius
- Security policies are consistently enforced

**Validation Method**: Comprehensive penetration testing and red team exercises

**Timeline**: 12 weeks  
**Owner**: Security Architecture Team  
**Dependencies**: Network infrastructure upgrade

---

## Implementation Tracking

### Weekly Security Control Status Review

**Week 1-2**: Focus on SEC-001 (Sandbox) and SEC-004 (Quarantine)
**Week 3-4**: Complete SEC-002 (SAST) and SEC-003 (PKI)
**Week 5-6**: Implement SEC-005 (Dependency Scanning)
**Week 7-8**: Deploy SEC-006 (RBAC) and begin SEC-007 (SIEM)
**Week 9-12**: Complete SEC-007 (SIEM) and begin SEC-008 (Compliance)
**Week 13-16**: Finalize all Priority 3-4 controls

### Risk Mitigation Progress Tracking

| Control ID | Risk Mitigated | Current Risk Level | Target Risk Level | Status |
|------------|----------------|-------------------|-------------------|---------|
| SEC-001 | Malicious Code Execution | Critical | Low | Not Started |
| SEC-002 | Code Injection | Critical | Low | Not Started |
| SEC-003 | Content Tampering | High | Low | Not Started |
| SEC-004 | Incident Response | High | Low | Not Started |
| SEC-005 | Dependency Poisoning | Critical | Medium | Not Started |
| SEC-006 | Unauthorized Access | High | Low | Not Started |
| SEC-007 | Security Blindness | High | Low | Not Started |
| SEC-008 | Compliance Gaps | Medium | Low | Not Started |
| SEC-009 | Advanced Threats | Medium | Low | Not Started |
| SEC-010 | Network Attacks | Medium | Low | Not Started |

### Security Metrics and KPIs

#### Security Control Effectiveness Metrics
- **Time to Detection (TTD)**: Mean time to detect security incidents
- **Time to Response (TTR)**: Mean time to respond to security incidents  
- **False Positive Rate**: Percentage of false security alerts
- **Coverage Percentage**: Percentage of attack vectors covered by controls
- **Compliance Score**: Percentage of security requirements met

#### Extension Security Quality Metrics
- **Security Scan Pass Rate**: Percentage of extensions passing security scans
- **Vulnerability Density**: Number of vulnerabilities per extension
- **Mean Time to Remediation**: Average time to fix security issues
- **Security Training Completion**: Percentage of publishers completing security training

## Conclusion

This security controls checklist provides a comprehensive roadmap for implementing robust security measures for the AgentExtension architecture. Successful implementation of these controls is essential for:

- Protecting against malicious extensions and supply chain attacks
- Ensuring compliance with security standards and regulations
- Maintaining trust in the A2A Registry ecosystem
- Enabling safe innovation through extensibility

Regular review and updates of this checklist ensure that security controls evolve with the threat landscape and business requirements.

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**Document Owner**: Security Engineering Team  
**Review Frequency**: Monthly  
**Next Review Date**: September 3, 2025