Binance Smart Chain
Rewards - Bug Bounties
The problem is that the multibuy method, which allows users to buy multiple tickets in the same transaction to save gas, didn’t prevent users from buying a ticket while the lottery was still in the drawing phase. This means that a user could see the transaction to draw the winning lottery number, compute it, and buy that ticket.
Days in Operation:
Whitehat hacker Thunder requested disclosure assistance from Immunefi for a critical vulnerability found in PancakeSwap’s lottery contract. This vulnerability was never exploited and was fixed before any malicious actors had the chance to exploit it.
The vulnerability allowed for a malicious user to use the multibuy method to purchase tickets while the lottery was still in the drawing phase. This meant that a user could see the lottery draw transaction, compute the winning lottery number, buy the right ticket during the draw, and frontrun with a high gas fee to win the lottery. PancakeSwap fixed the vulnerability by updating its contract to include protections against buying using the multibuy method during the drawing phase.
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