Scout MCP

# Security Remediation Checklist - Scout MCP **Date:** 2025-01-28 **Status:** IN PROGRESS --- ## Phase 1: CRITICAL Fixes (Week 1) ### ✅ V-001: Command Injection (CVSS 9.8) **Files to Modify:** - [ ] Create `scout_mcp/mcp_cat/validators.py` - [ ] Update `scout_mcp/mcp_cat/executors.py` - [ ] Create `tests/test_validators.py` **Implementation Checklist:** - [ ] Create `ALLOWED_COMMANDS` allowlist - [ ] Implement `validate_command()` function - [ ] Implement `validate_path()` function - [ ] Add `ValidationError` exception class - [ ] Update `run_command()` to use validation - [ ] Update `stat_path()` to use `shlex.quote()` - [ ] Update `cat_file()` to use validation - [ ] Update `ls_dir()` to use validation - [ ] Add timeout protection to all remote operations **Testing Requirements:** - [ ] Test valid commands pass - [ ] Test command injection attempts fail - [ ] Test disallowed commands fail - [ ] Test dangerous flags blocked - [ ] Test empty commands rejected - [ ] Test path traversal blocked - [ ] Test relative paths rejected - [ ] Test sensitive paths blocked - [ ] Test null bytes in paths rejected - [ ] Test validation performance < 1ms **Acceptance Criteria:** - [ ] All tests pass (100% coverage on validators) - [ ] Command injection attacks blocked - [ ] Path traversal attacks blocked - [ ] Error messages don't leak information - [ ] Code review approved - [ ] Security review approved --- ### ✅ V-002: SSH Host Key Bypass (CVSS 9.1) **Files to Modify:** - [ ] Update `scout_mcp/mcp_cat/pool.py` - [ ] Update `scout_mcp/mcp_cat/config.py` - [ ] Create `tests/test_pool_security.py` **Implementation Checklist:** - [ ] Add `known_hosts_path` parameter to `ConnectionPool` - [ ] Change `known_hosts=None` to proper path - [ ] Add connection timeout (`asyncio.wait_for`) - [ ] Add SSH timeout parameters (`connect_timeout`, `login_timeout`) - [ ] Configure secure cipher suites - [ ] Add proper exception handling for `HostKeyNotVerifiable` - [ ] Add connection pool limit (`max_connections`) - [ ] Add security logging for connections - [ ] Implement keepalive for connection health **Testing Requirements:** - [ ] Test host key verification enabled - [ ] Test connection fails on bad host key - [ ] Test connection timeout works - [ ] Test connection pool limit enforced - [ ] Test connection reuse works - [ ] Test stale connections cleaned up - [ ] Test secure ciphers used **Acceptance Criteria:** - [ ] All tests pass - [ ] Host key verification mandatory - [ ] Timeouts prevent hangs - [ ] Connection pool limits enforced - [ ] Logging shows all connection events - [ ] Code review approved - [ ] Security review approved --- ### ✅ V-003: Path Traversal (CVSS 8.6) **Status:** Fixed in V-001 (validators.py) - [ ] Verify path validation integrated - [ ] Verify tests cover all traversal scenarios --- ## Phase 2: HIGH Severity (Week 2) ### ✅ V-004: No Connection Timeouts (CVSS 7.5) **Status:** Fixed in V-002 - [ ] Verify all SSH operations have timeouts - [ ] Verify timeout tests pass --- ### ✅ V-005: Insufficient Input Validation (CVSS 7.0) **Status:** Fixed in V-001 - [ ] Verify comprehensive validation in place - [ ] Verify validation tests comprehensive --- ### ✅ V-006: Weak Access Control (CVSS 6.5) **Files to Modify:** - [ ] Update `scout_mcp/mcp_cat/config.py` - [ ] Create `tests/test_access_control.py` **Implementation Checklist:** - [ ] Add `allowed_ip_ranges` field - [ ] Add `blocked_ip_ranges` field - [ ] Add `require_explicit_allow` field (default True) - [ ] Add `max_connections` field - [ ] Implement `_is_ip_allowed()` method - [ ] Update `_is_host_allowed()` with IP checks - [ ] Add default deny when no allowlist **Testing Requirements:** - [ ] Test IP allowlist works - [ ] Test IP blocklist works - [ ] Test default deny enforced - [ ] Test hostname + IP filtering combined - [ ] Test special IP ranges blocked **Acceptance Criteria:** - [ ] All tests pass - [ ] Default deny policy active - [ ] IP-based filtering works - [ ] Documentation updated --- ## Phase 3: MEDIUM Severity (Week 3) ### ✅ V-007: Information Disclosure (CVSS 5.3) **Files to Modify:** - [ ] Update `scout_mcp/mcp_cat/server.py` - [ ] Create logging configuration **Implementation Checklist:** - [ ] Replace detailed errors with generic messages - [ ] Add structured logging for internal errors - [ ] Log detailed errors internally only - [ ] Return user-friendly errors externally - [ ] Remove stack traces from user output **Testing Requirements:** - [ ] Test errors don't leak paths - [ ] Test errors don't leak system info - [ ] Test internal logging captures details - [ ] Test error messages are user-friendly **Acceptance Criteria:** - [ ] No information disclosure in errors - [ ] Internal logging comprehensive - [ ] User experience maintained --- ### ✅ V-008: No Rate Limiting (CVSS 5.0) **Files to Modify:** - [ ] Create `scout_mcp/mcp_cat/rate_limiter.py` - [ ] Update `scout_mcp/mcp_cat/server.py` - [ ] Create `tests/test_rate_limiter.py` **Implementation Checklist:** - [ ] Create `RateLimiter` class (token bucket) - [ ] Add per-host rate limiting - [ ] Add global rate limiting - [ ] Integrate into `scout()` tool - [ ] Add configuration for limits **Testing Requirements:** - [ ] Test rate limiting enforced - [ ] Test limits configurable - [ ] Test reset after time window - [ ] Test per-host isolation **Acceptance Criteria:** - [ ] Rate limiting active - [ ] DoS attacks mitigated - [ ] Legitimate use not impacted --- ### ✅ V-009: Race Conditions (CVSS 5.0) **Files to Modify:** - [ ] Update `scout_mcp/mcp_cat/server.py` - [ ] Create `tests/test_concurrency.py` **Implementation Checklist:** - [ ] Add `asyncio.Lock` for global state - [ ] Implement double-check locking for singletons - [ ] Make `get_config()` async - [ ] Make `get_pool()` async - [ ] Update all callers **Testing Requirements:** - [ ] Test concurrent initialization - [ ] Test no duplicate instances - [ ] Test thread safety **Acceptance Criteria:** - [ ] No race conditions - [ ] Single instance guarantee - [ ] Tests pass with concurrent requests --- ### ✅ V-010: No Security Logging (CVSS 5.0) **Files to Modify:** - [ ] Create `scout_mcp/mcp_cat/logging_config.py` - [ ] Update all modules with logging - [ ] Create `tests/test_logging.py` **Implementation Checklist:** - [ ] Configure structured logging - [ ] Log all connection attempts - [ ] Log all command executions - [ ] Log access control violations - [ ] Log rate limit violations - [ ] Log validation failures - [ ] Add request IDs for tracing **Testing Requirements:** - [ ] Test all events logged - [ ] Test log format structured - [ ] Test sensitive data not logged - [ ] Test log rotation works **Acceptance Criteria:** - [ ] Comprehensive audit trail - [ ] Security events detectable - [ ] Compliance requirements met --- ## Phase 4: Hardening (Week 4) ### ✅ Security Testing Suite **Tasks:** - [ ] Create `tests/test_security_regression.py` - [ ] Add command injection test suite - [ ] Add path traversal test suite - [ ] Add MITM test cases - [ ] Add fuzzing tests - [ ] Add performance tests - [ ] Achieve >85% code coverage **Tools:** - [ ] Configure Bandit for SAST - [ ] Configure Semgrep rules - [ ] Run pip-audit in CI - [ ] Add pre-commit hooks **Acceptance Criteria:** - [ ] All security tests pass - [ ] Code coverage >85% - [ ] No SAST findings - [ ] No dependency vulnerabilities --- ### ✅ Documentation **Tasks:** - [ ] Security architecture document - [ ] Deployment security guide - [ ] Configuration examples (secure) - [ ] Incident response procedures - [ ] Security API documentation - [ ] User security guidelines **Acceptance Criteria:** - [ ] All docs complete - [ ] Examples tested and working - [ ] Reviewed by security team --- ### ✅ Monitoring & Alerting **Tasks:** - [ ] Create `scout_mcp/mcp_cat/metrics.py` - [ ] Add security metrics collection - [ ] Configure alert thresholds - [ ] Document monitoring requirements - [ ] Create Grafana dashboard (optional) **Metrics to Track:** - [ ] Connection attempts (success/fail) - [ ] Command executions - [ ] Validation failures - [ ] Rate limit violations - [ ] Error rates - [ ] Response times **Acceptance Criteria:** - [ ] Metrics collected - [ ] Alerts configured - [ ] Dashboard functional - [ ] Documentation complete --- ## Final Validation ### Pre-Deployment Checklist **Code Quality:** - [ ] All unit tests pass (100%) - [ ] All integration tests pass - [ ] Code coverage >85% - [ ] No linting errors (ruff) - [ ] No type errors (mypy --strict) - [ ] No SAST findings (Bandit, Semgrep) **Security:** - [ ] All critical vulnerabilities fixed - [ ] All high vulnerabilities fixed - [ ] All medium vulnerabilities fixed - [ ] Penetration testing complete - [ ] Security review approved - [ ] Threat model updated **Documentation:** - [ ] README updated - [ ] Security docs complete - [ ] API documentation current - [ ] Configuration examples tested - [ ] Deployment guide reviewed **Compliance:** - [ ] OWASP Top 10 compliance verified - [ ] Regulatory requirements met - [ ] Audit trail functional - [ ] Incident response plan ready **Operations:** - [ ] Staging deployment successful - [ ] Monitoring configured - [ ] Alerting tested - [ ] Rollback plan documented - [ ] Team training complete --- ## Sign-Off ### Phase 1 Completion - [ ] Developer: _________________ Date: _______ - [ ] Code Reviewer: _____________ Date: _______ - [ ] Security Reviewer: _________ Date: _______ ### Phase 2 Completion - [ ] Developer: _________________ Date: _______ - [ ] Code Reviewer: _____________ Date: _______ - [ ] Security Reviewer: _________ Date: _______ ### Phase 3 Completion - [ ] Developer: _________________ Date: _______ - [ ] Code Reviewer: _____________ Date: _______ - [ ] Security Reviewer: _________ Date: _______ ### Phase 4 Completion - [ ] Developer: _________________ Date: _______ - [ ] Security Tester: ___________ Date: _______ - [ ] Security Team Lead: ________ Date: _______ ### Production Deployment Approval - [ ] Engineering Lead: __________ Date: _______ - [ ] Security Team: _____________ Date: _______ - [ ] Product Management: ________ Date: _______ - [ ] Executive Sponsor: _________ Date: _______ --- ## Progress Tracking | Phase | Start Date | Target Date | Completion Date | Status | |-------|------------|-------------|-----------------|--------| | Phase 1 | _________ | _________ | _________ | ⬜ Not Started | | Phase 2 | _________ | _________ | _________ | ⬜ Not Started | | Phase 3 | _________ | _________ | _________ | ⬜ Not Started | | Phase 4 | _________ | _________ | _________ | ⬜ Not Started | **Legend:** - ⬜ Not Started - 🟡 In Progress - ✅ Complete - ❌ Blocked --- ## Notes **Blockers:** **Risks:** **Questions:** --- **Last Updated:** 2025-01-28 **Owner:** Development Team **Next Review:** Upon Phase 1 completion