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On the 18th of July 2023, Ocean BNO on the Binance Sensible Chain was attacked. The assault was made attainable by a sensible contract vulnerability. And round $500k price of BNO tokens was swapped to BUSD by the attacker.
About Venture:
Ocean Nft is a blockchain-based NFT MarketPlace. For extra data, take a look at their web site.
Vulnerability Evaluation & Affect:
On-Chain Particulars:
Attacker Tackle: 0xA6566574eDC60D7B2AdbacEdB71D5142cf2677fB
Sufferer Contract: 0xD138b9a58D3e5f4be1CD5eC90B66310e241C13CD
Assault Transaction: 0x33fed54de490797b99b2fc7a159e43af57e9e6bdefc2c2d052dc814cfe0096b9
The Root Trigger:
- The foundation trigger for the exploit was an incorrect report of rewards for NFT and ERC20 tokens.
- Withdrawing of staked NFT didn’t occur throughout the execution of Emergency Withdrawl, and rewardDebt was set to 0.
- This resulted in NFT changing into reclaimable even when the stake was cancelled
- The attacker was in a position to exploit emergencyWithdraw() perform to clear the person’s reward debt to zero and make a revenue for himself.
Assault Course of:
- Firstly, the attacker stakes NFTs and BNO tokens by means of stakedNFT() and pledge() capabilities.
- Then the attacker known as emergencyWithdraw perform
- This enables him to unstake NFT whereas concurrently getting the rewards.
- The method was repeated a number of occasions to extend revenue.
- Lastly, the exploiter swapped the rewards into BUSD.
Move of Funds:
A lot of the funds have been despatched to this tackle – 0xdc109426972ae14d5b3d7e91b47d42ff1fd3c8cc
For extra particulars, verify right here.
Attacker’s Wallets:
Here’s a snippet of the attacker’s pockets. Examine the entire particulars right here.
After the Exploit
- The Venture has not acknowledged the assault on the time of scripting this postmortem.
Incident Timelines
Jul-18-2023 12:57:13 AM +UTC) – The assault started.
Jul-18-2023 12:57:13 AM +UTC – Exploiter swapped his revenue for $504k BUSD
Value Affect
The value of the BNO token dropped by 99% from $4.0 to $0.04 instantly following the assault.
How may they’ve prevented the Exploit?
When coping with a contract that accommodates a number of token requirements, it’s important to make sure that the enterprise logic and mathematical operations for every token are accounted for and managed independently.
To ensure the accuracy and performance of the code, it’s essential to write down complete take a look at instances that completely cowl all potential enterprise situations.
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