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ID:

pancakeswap-1150

Date:

Status:

Incident Count:

February 22, 2021

Near-Miss

5

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REKT

Contributor:

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web3rekt.com

KYC By:

KYC:

None

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Audit By:

Audits:

PeckShield, Slowmist

Loss Amount:

-

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Recovered:

-

Rewards:

7,500

Currency:

USD

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Key Indicators

Platform:

Type:

Category:

Method:

Data Sources:

Binance Smart Chain

Protocol

Dexes

Rewards - Bug Bounties

Extended Method:

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.

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Days in Operation:

732

(2.01 Years)

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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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