Ripple - Single Asset Vault - Smart Contract Assessment

Introduction#

Ripple engaged Halborn to conduct a security assessment on XRP Ledger (XRPL) feature amendments beginning on February 17, 2025 and ending on March 13, 2025, focusing on PR #5224

The feature introduces a Single Asset Tokenized Vault, a new on-chain primitive that allows for aggregating assets (XRP, IOU, or MPT) from one or more depositors and represents ownership through MPToken shares. The vault serves as a foundational building block for diverse purposes such as lending markets, aggregators, yield-bearing tokens, and asset management by decoupling the liquidity provision functionality from specific protocol logic. The implementation includes core functionality for vault creation, deposits, withdrawals, and clawback operations, with support for both public and private vaults through permissioned domains.

Assessment Summary#

The team at Halborn assigned a full-time security engineer to assess the security of the node. The security engineer is a blockchain and smart-contract security expert in advanced penetration testing, smart-contract hacking, and deep knowledge of multiple blockchain protocols.

The scope of this audit encompasses:

• Single Asset Vault Ledger Entry Implementation

• Core Vault Transaction Types (Create, Set, Delete, Deposit, Withdraw, Clawback)

• Share Token Management and Access Controls

• Asset Handling and Transfer Mechanisms

• Vault State Management and Accounting

Test Approach and Methodology#

Halborn performed a combination of manual review of the code and automated security testing to balance efficiency, timeliness, practicality, and accuracy in regard to the scope of the Batch Transaction feature security assessment. The following phases and tools were used:

• Research into the architecture and mechanics of the Single Asset Vault through review of the specification, including asset management, share tokenization, and vault ownership models.

• Manual code review and walkthrough to identify potential vulnerabilities in vault operations, share calculations, and asset transfers.

• Security control testing for vault access restrictions, private vault permissions, and non-transferable share enforcement.

• Documentation analysis covering vault creation parameters, transaction flows, and security considerations.

• Edge case testing for asset freezes, transfer fees, and maximum vault capacity limits.

• Functional testing of transaction processing flows and error handling mechanisms.

• Review of error handling and recovery mechanisms.

Risk Methodology#

Scope#