Logic error, lack of buyer verification
Days in Operation:
100 pts each
Quixotic is the largest NFT marketplace on Optimism.
The project team announced that in a recent update to their contract, a vulnerability was present and exploited allowing a hacker to steal approved ERC-20 tokens. The exploited contract has been permanently paused, and refunds will be sent out automatically over the coming days.
End users must revoke access to Quixotic smart contract from https://revoke.cash asap.
According to SlowMist, there was a verification logic error in the contract where in the fillSellOrder function of the market contract, only the sell order is checked, but the buyer's buy order is not checked. As the outcome, the attacker can first creates a worthless NFT and then calls the fillSellOrder function to generate a sell order for this NFT, passing in the victim's address and the token that the user has approved to the market, to steal the user's approved assets.
The hacker has stolen about 220,000 OP, and then exchanged it for USDC and cross-chain to the BNB chain, and then swapped it to BNB and transferred it to Tornado.Cash. Boesin reported that an aggregated of 847 BNB was taken.
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