Incident Overview
South Korean exchange Yapizon has become the victim of hackers, reportedly losing 3,800 BTC in customer funds.
The exchange confirmed the theft of 3,831 Bitcoins, “equivalent to 37.08% of the total assets.”
“After many discussions, legal and accounting consultations and reviews, We have come to the conclusion that it should be applied fairly to all members. It is also the most common way to go through the liquidation process. The loss of 37.08% will have the same effect on all members' assets.” -Yapizon said.
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 Yapizon, these are the critical security checks that could have prevented this incident (April 2017).
- Verify all logic paths related to Other are guarded by proper access controls and input validation
- 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.
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Learn to Prevent the Next Yapizon
The Yapizon 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.