HUNDRED FINANCE

DESCRIPTION OF EVENTS

"Hundred is a Compound fork which uses hTokens to track lending positions. It was audited in Feb 2022 by WhiteHatDAO."

"HUNDRED FINANCE A multi-chain lending protocol using veHND model, it integrates with Chainlink oracles to ensure market health and stability."

"Since the explosion in popularity of the decentralized finance ecosystem in 2020, borrowing and lending platforms have become core infrastructure within the cryptocurrency space. Not only do they provide users the ability to “hodl” or leverage their crypto assets, obtaining liquidity from their investments (a crypto-backed loan) while simultaneously earning interest, they also underpin the workings of many other protocols. The movement of assets from the Ethereum mainnet to EVM-compatible blockchains and scaling solutions has only emphasized their importance. Platforms that grant the ability to borrow and lend are one of the key applications users look for on any emerging chain. Hundred Finance aims to play a central role in provisioning borrowing and lending services in the multi-chain world, granting the ability to earn yield and borrow assets to a users in a trustless, secure, and economically efficient manner."

"Hundred Finance first launched on Ethereum’s Kovan testnet in late-June of 2021. Following a two-month period of extensive testing, it was then soft-launched on the Ethereum mainnet in preparation for the generation of the HND token. With the platform and token up and running, the fully-enabled Arbitrum version of the Hundred Finance dApp was deployed and the distribution of HND began."

"In December of 2021, a vote-escrow governance token mechanism was implemented using contracts developed by Curve Finance. This addition facilitated direct community involvement in the emission of HND through the use of stablecoin staking contracts known as gauges. These gauges receive a quantity of HND per epoch (one-week period) based on votes cast by our multichain mveHND (mirrored vote-escrow HND) governance token holders."

"The distribution of HND is ongoing, as the broadening of the ownership of our governance token and the platform’s usage are the principle means by which Hundred Finance is acquiring a decentralized, community governance structure and the ability to function as a trustless provider of borrowing and lending services."

"The goal of Hundred Finance is to expand to multiple chains in order to deliver its decentralized and economically efficient financial services as widely as possible. The Hundred Finance dApp grants users access to these networks through its integration with compatible Web3 wallets. Users are able to select the network they wish to interact with from the platform’s main page, an action that will automatically trigger the selection of the correct network by their browser-integrated Web3 wallet. While the platform maintains the same core functionality independent of the chain, assets, interest rates and other variables, such as transaction costs, differ between them."

"Shortly after 2pm UTC on April 15th, Hundred Finance suffered a $7.4M exploit on Optimism." "[T]he attack vector was the same reentrancy mechanism which hit CREAM Finance in August 2021."

"The root cause appears the attacker donates 200 WBTC to inflate hWBTC's exchange rate so that even a tiny amount (2 wei) of hWBTC can basically drain current lending pools."

"It looks that Hundred got hacked on #Optimism. We will update when there is more information to it."

"The root cause is that the attacker can manipulate the exchangeRate by donating a large amount of WBTC to the hWBTC contract.

In the getAccountSnapshot function, the value of exchangeRateMantissa relies on the amount of WBTC in the contract.

The attacker flashloaned 500 $WBTC, then called the redeem function to redeem the previously staked 0.3 WBTC.

Next, the attack contract 1 sent 500.3 WBTC to attack contract 2. Contract 2 used 4 BTC to mint 200 hWBTC. The redeem function was then called to redeem the 4 BTC.

Here the attacker can redeem the 4 WBTC previously staked with less than 200 hWBTC. At this point the attacker had a very small amount of hWBTC left on contract 2.

Attack contract 2 then sent 500.3 WBTC to the hWBTC contract and borrowed 1021.91 ETH via the remaining 2 hWBTCs.

Finally the attack contract 2 repaid the previous debt by using 1 hWBTC, and withdrew 500.3 WBTC from the contract."

"48h passed since we sent an on-chain message to the hacker and tried to start negotiations with him.

Today we are launching a $500k reward in the hope that this provides additional incentive for info that leads to the Hundred attacker’s arrest and the return of all funds."

Explore This Case Further On Our Wiki

Hundred Finance is a multi-chain lending protocol that allows users to borrow and lend assets in a decentralized and economically efficient manner. It was audited by WhiteHatDAO in Feb 2022. The platform integrates with Chainlink oracles to ensure market health and stability. The distribution of HND, its governance token, is ongoing to broaden the ownership of the governance token and the platform's usage. The platform aims to expand to multiple chains in order to deliver its decentralized financial services as widely as possible. However, on April 15th, Hundred Finance suffered a $7.4M exploit on Optimism due to the attacker manipulating the exchange rate by donating a large amount of WBTC to the hWBTC contract. The root cause appears to be the same reentrancy mechanism that hit CREAM Finance in August 2021. Hundred Finance launched a $500k reward for information leading to the attacker's arrest and the return of all funds.

Rekt - Hundred Finance - REKT 2 (May 3)
@HundredFinance Twitter (May 3)
Optimistic L2 Transaction Hash (Txhash) Details | Optimism  (May 3)
Optimistic L2 Transaction Hash (Txhash) Details | Optimism  (May 3)
@peckshield Twitter (May 3)
@BeosinAlert Twitter (May 3)
@HundredFinance Twitter (May 3)

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