Incident Overview
EraLend, a zkSync Era lending protocol, was exploited via a read-only reentrancy attack, leading to a loss of approximately 3,400,000 $USD.
EraLend, a lending protocol on zkSync Era, fell victim to an exploit. The root cause has been identified as a read-only reentrancy attack, which resulted in a substantial loss of around 3,400,000 $USD.
Attacker Address: https://explorer.zksync.io/accounts/0xf1D076c9…5ECE7a
Malicious Transactions:
https://explorer.zksync.io/transactions/0x99efebac…4ab0ef
https://explorer.zksync.io/transactions/0x7ac4da1e…8bfe98
Malicious Contracts:
https://explorer.zksync.io/address/0x7d8772DC…F335F0
https://explorer.zksync.io/address/0xC5c668Dc…338035
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 EraLend, these are the critical security checks that could have prevented this incident (July 2023).
- Verify all logic paths related to Reentrancy are guarded by proper access controls and input validation - see the Reentrancy 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 TrialSecurity Audit History
- Audit Report 1 Report
Related Attack Classes
The technique used in this hack maps to these vulnerability classes in our security curriculum:
Sources & References
Learn to Prevent the Next EraLend
The EraLend 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.