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Gathera Security Audit Report

Date: March 29, 2026 Auditor: Antigravity AI Scope: Gathera Smart Contract Suite (v0.1.0-alpha) Repo: Gathera/Gatherraa

1. Executive Summary

This report provides a comprehensive security audit of the Gathera smart contract ecosystem. Gathera is a decentralized event management platform on the Stellar Soroban network.

The audit identified significant gaps in the current implementation, primarily due to the codebase being in an early "skeleton" phase where core logic is defined but not yet implemented.

2. Methodology

The audit was conducted using the following techniques:

  • Architecture Review: Analyzing the interaction patterns between ticketing, escrow, and multisig modules.
  • Static Analysis: Manual review of the Rust/Soroban interface definitions.
  • Threat Modeling: Identifying potential attack vectors based on the intended business logic.

3. Risk Rating Scale

  • Critical: High likelihood of immediate loss of funds or total system compromise.
  • High: Significant security risk requiring immediate attention before mainnet deployment.
  • Medium: Moderate risk with potential for exploitation under specific conditions.
  • Low: Minor issues, best practices violations, or informational findings.

4. Key Findings

[CRITICAL] Core Logic Not Implemented (G-AUD-001)

  • Status: Open
  • Description: Almost all critical functions in ticket_contract, escrow_contract, and multisig_wallet_contract are currently stubs using the todo! macro.
  • Impact: The system is completely non-functional from a security perspective. No actual transfers or validations are occurring.
  • Recommendation: Prioritize the implementation of the core logic following the "Checks-Effects-Interactions" pattern.

[HIGH] Missing Unified Access Control (G-AUD-002)

  • Status: Open
  • Description: Interface definitions do not explicitly enforce role-based access control (RBAC). For example, issue_ticket does not currently verify if the caller is an authorized organizer.
  • Impact: Unauthorized users could potentially mint tickets or release funds once the todo! blocks are replaced with naive logic.
  • Recommendation: Implement a robust RBAC system in the common module and use it as a decorator/wrapper for all sensitive functions.

[MEDIUM] Potential for Reentrancy in Cross-Contract Calls (G-AUD-003)

  • Status: Preventative
  • Description: The cross_contract_contract orchestrates calls across multiple modules. Without explicit guards, circular calls could lead to reentrancy.
  • Impact: Double-spending of ticket credits or multiple fund releases.
  • Recommendation: Implement reentrancy guards at the interface level for any function that interacts with external contracts or transfers value.

[LOW] Integer Overflow Protection (G-AUD-004)

  • Status: Preventative
  • Description: While Rust provides some protection, the use of u128 for balances requires consistent use of checked math (e.g., checked_add, checked_mul).
  • Impact: Arithmetic errors leading to incorrect balance updates.
  • Recommendation: Standardize on checked arithmetic throughout the codebase.

5. Remediation Plan

  1. Phase 1: Foundation (Current)
    • Implement gathera-common utilities for RBAC and SafeMath.
    • Replace todo! in ticket_contract with verified minting logic.
  2. Phase 2: Interaction
    • Implement escrow_contract with multi-owner approval logic.
    • Add integration tests for ticket-escrow workflows.
  3. Phase 3: Hardening
    • Integrate zk_ticket_contract for privacy.
    • Conduct a secondary audit after implementation is complete.

6. Conclusion

The Gathera contract suite has a solid architectural foundation but lacks implementation. Security must be "built-in" during the next development phase to ensure the platform can safely handle real-world event ticketing and fund management.