Incident Overview
Arcadia is a non-custodial protocol enabling composable cross-margin accounts on-chain. Margin account users can collateralize entire portfolios, access up to 10x more capital than their initial collateral value, and use their deposited collateral and the borrowed capital to permissionless interact with any other protocol from a single cross-margin account. Lenders supply assets to Arcadia's lending pools, earning passive yields for providing liquidity to margin account users.
Incident Report
Protocol Information
What the Attacker Needed to Succeed
Understanding the prerequisites for this type of attack helps auditors identify protocols that are most at risk and helps developers build better defenses.
What Auditors Should Check
If you're auditing a protocol with similar architecture to Arcadia V1, these are the critical security checks that could have prevented this incident (July 2023).
- Verify all logic paths related to Flashloan Reentrancy Attack are guarded by proper access controls and input validation - see the Flash Loans Attacks attack class for patterns
- Check that all state-changing functions follow the Checks-Effects-Interactions (CEI) pattern to prevent reentrancy and logic ordering bugs
- Review privileged functions (owner, admin, governance) for potential abuse vectors - centralization risks should be documented and bounded with timelocks or multi-sigs
Master these auditing techniques with hands-on labs and real exploit scenarios in the Smart Contract Hacking course.
Free TrialRelated Attack Classes
The technique used in this hack maps to these vulnerability classes in our security curriculum:
Sources & References
Learn to Prevent the Next Arcadia V1
The Arcadia V1 hack is one of many attacks that skilled auditors are trained to detect before deployment. Master real exploit patterns and defense techniques with hands-on Web3 security training.