Incident Overview
Zerogoki was attacked by way of compromising the price oracle. The attacker provided a price oracle signed by legitimate private keys, which contained a crafted number of tokens to be swapped. However, the reason why the attacker could construct a valid signature is unknown.
The attacker's address:
https://etherscan.io/address/0xaef46df5…30680d
The transaction behind the attack:
https://etherscan.io/tx/0x81e5f715…21acf8
In the attack transaction, the attacker constructed a message that contained valid signatures and passed a crafted ns parameter (which contains a large number of zUSD). As a result, the attacker used 300 REI to swap 700k zUSD.
Three addresses that are collated with the signatures are:
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 Zerogoki, these are the critical security checks that could have prevented this incident (August 2021).
- 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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