Abstract:
On the 18th of October 2023, HopeLend Protocol on the Ethereum chain was attacked. The assault was made doable by a Precision Loss vulnerability. Round $835k was stolen from the exploit.
About Undertaking:
HopeLend is a decentralized, non-custodial lending protocol. To be taught extra about them, try their documentation.
Vulnerability Evaluation & Influence:
On-Chain Particulars:
Attacker Deal with: 0x1F23eb80f0c16758E4A55D48097c343bD20Be56f 0xa8bbb3742f299b183190a9b079f1c0db8924145b, 0x9a9122Ef3C4B33cAe7902EDFCD5F5a486792Bc3A,
Sufferer Contract: 0xc74b72bbf904bac9fac880303922fc76a69f0bb4
Assault Transaction: 0x1a7ee0a7efc70ed7429edef069a1dd001fbff378748d91f17ab1876dc6d10392
The Root Trigger:
The basis trigger was the lack of precision loss in Htoken’s contract.
The attacker took the benefit of lack of precision in calculating liquidity index throughout execution of _handleFlashLoanRepayment
Assault Course of:
First, the attacker took a FlashLoan of 2k WBTC. adopted by including that into the Pool contract’s reserve’s liquidity index
The attacker was capable of change the liquidity index of hEthWBTC from 1e27 to 7,560,000,001e27
The attacker enhance it’s revenue by borrowing belongings from totally different markets.
This resulted in hacker profiting by paying much less collateral of WBTC because of precision loss
Stream of Funds:
Right here is the fund circulate throughout and after the exploit. You’ll be able to see extra particulars right here.
Attacker’s Wallets:
It’s price noting {that a} Generalized frontrunner 0x9a9122Ef3C4B33cAe7902EDFCD5F5a486792Bc3A was capable of frontrun the unique transaction by paying a bribe of 263ETH to one of many validatiors managed by Lido
Here’s a snippet of the pockets deal with
After the Exploit
The Undertaking acknowledged the hack through their Twitter.
Incident Timelines
Oct-18-2023 11:48:59 AM +UTC – The malicious transaction occurred
Oct-18-2023 11:48:59 AM +UTC – The unique transaction was frontrunned.
How might they’ve prevented the Exploit?
It’s suggest to test all of the instances for precision loss
If doable, protocols are requested to give attention to complete invariant testing
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