Incident Overview
DeFi protocol Unizen suffered a $2.1 million exploit, prompting the immediate reimbursement of affected users. The exploit involved a compromised platform and the draining of user funds, leading to significant financial losses.
On March 9th, blockchain analytics firm PeckShield identified an "approve issue" with Unizen, resulting in over $2 million being drained from the platform. The attacker exchanged Tether (USDT) for Dai (DAI), causing substantial losses. Unizen quickly initiated bounty negotiations with the hacker and began collaborating with law enforcement and forensic experts to identify the perpetrator.
Despite ongoing negotiations, Unizen promptly refunded 99% of affected users, with refunds starting on March 11th. CEO Sean Noga loaned funds to facilitate the reimbursement process, with users who lost below $750,000 receiving refunds in USDT or USD Coin (USDC).
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 Unizen, these are the critical security checks that could have prevented this incident (March 2024).
- Verify all logic paths related to External Call Vulnerability / Other are guarded by proper access controls and input validation - see the Delegatecall & Call Injection Attacks attack class for patterns
- 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:
Proof-of-Concept Exploits
On-Chain Evidence & References
- Twitter/X Alert https://twitter.com/Phalcon_xyz/status/1766274000534004187
- Twitter/X Alert https://twitter.com/AnciliaInc/status/1766261463025684707
Sources & References
Learn to Prevent the Next Unizen
The Unizen 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.