# Attack Surface Analysis Overra is intentionally designed to minimize attack surface through architectural constraint and separation of responsibilities. This section identifies the primary exposure surfaces within the system and explains how each is mitigated. Security is strengthened not by eliminating all surfaces, but by limiting capability and enforcing strict boundaries. *** ### Overview of Attack Surfaces **The Overra system consists of the following externally accessible surfaces:** 1. Wallet signature interface 2. Dashboard interface 3. Local agent communication endpoint 4. Authorization payload handling 5. Containment enforcement layer 6. Audit logging subsystem Each surface is analyzed below. *** ### 1. Wallet Signature Interface #### Surface Description The wallet signs structured authorization payloads. #### Potential Risk * Malicious UI attempting to trick user into signing unintended payload * Payload tampering before signing #### Mitigation * Structured payload schema * Device binding within payload * Expiration window enforcement * Nonce replay protection The wallet signature alone does not mutate state. The local agent performs full verification. *** ### 2. Dashboard Interface #### Surface Description The dashboard constructs and transmits authorization payloads. #### Potential Risk * Compromised frontend logic * Malicious payload injection * Unauthorized requests submitted to agent #### Mitigation * Dashboard is not trusted for enforcement * All validation occurs in local agent * Unsigned or malformed requests are rejected * Authority matching enforced locally Compromise of the dashboard cannot bypass cryptographic verification. *** ### 3. Local Agent Communication Endpoint #### Surface Description The dashboard communicates with the local agent via local endpoints. #### Potential Risk * Direct unauthorized requests * Replay attempts * Payload injection #### Mitigation * Signature verification required for all state mutations * Nonce replay protection * Timestamp validation * Expiration window enforcement The agent rejects any request failing validation. *** ### 4. Authorization Payload Handling #### Surface Description Structured authorization payload is parsed and verified. #### Potential Risk * Malformed payload injection * Schema manipulation * Field omission or corruption #### Mitigation * Strict schema validation * Type checking * Required field enforcement * Signature verification over entire payload Integrity of the payload is cryptographically protected. *** ### 5. Containment Enforcement Layer #### Surface Description The engine applies predefined containment actions. #### Potential Risk * Injection of arbitrary commands * Runtime policy manipulation * Privilege escalation through enforcement logic #### Mitigation * No remote shell capability * No dynamic scripting * No arbitrary command interface * Predefined execution sequence * Non-extensible enforcement scope Constraint significantly reduces exploit surface. *** ### 6. Audit Logging Subsystem #### Surface Description Append-only logging of all events. #### Potential Risk * Log tampering * Deletion or modification of entries * Suppression of failed attempts #### Mitigation * Append-only design * Local storage persistence * No dashboard-based deletion mechanism * Logging of both success and failure events Logs ensure traceability of security events. *** ### Minimized Capability Model Overra intentionally excludes high-risk features commonly found in administrative systems: * Remote shell execution * Dynamic command injection * Policy downloads from remote servers * Centralized override accounts * Broad administrative privileges By limiting functionality to deterministic containment, the system avoids expanding its attack surface unnecessarily. *** ### Boundary Summary **The largest remaining attack surfaces lie outside Overra’s defined scope:** * Compromised private keys * Kernel-level OS compromise * Full agent binary tampering * Physical device access Within its defined boundary, Overra enforces strict cryptographic validation before any state mutation. *** ### Attack Surface Summary **Overra’s attack surface is limited to:** * Signature verification logic * Local communication endpoint * Containment execution logic **Each is protected by:** * Deterministic validation * Constrained capability * Explicit trust boundaries * Append-only audit logging Security posture is strengthened by minimalism. 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