Yearn Finance, TMXTribe, Prism Protocol: $10.5M Lost to Mispriced Pools, Over-Minting, and Role Misuse
In Brief
TMXTribe lost $1.4M after due to a price manipulation exploit.
Prism Protocol lost $62K after a malicious contract was approved as a manager and used token burns to manipulate price.
Yearn Finance lost $9M after imbalanced deposits broke pool math and allowed over-minting.
Hacks Analysis
TMXTribe | Amount Lost: $1.4M
On January 6th, the TMXTribe exploit on Arbitrum resulted in a $1.4M loss. The root cause of the exploit was that TMXTribe’s contract allowed minting, staking, and swaps without validating balances or enforcing constraints. The attacker minted and staked TMX LP tokens using USDT, then swapped the same USDT into the protocol’s USDG stablecoin. The attacker then unstaked the LP tokens and sold the newly created USDG. The exploit was repeated continuously over 36 hours.
On December 11th, the Prism Protocol exploit on Binance Smart Chain resulted in a $62K loss. The root cause of the exploit was that a malicious contract was mistakenly approved as a SniperManager. This role assignment allowed the attacker to call the BurnSniperTokensBought() function and burn PRISM tokens. The attacker reduced the liquidity and artificially increased the PRISM token price, making a profit.
On November 30th, the Yearn Finance custom yETH pool exploit on Ethereum mainnet resulted in a $9M loss due to a logic vulnerability. The attacker made imbalanced deposits that pushed the pool’s internal calculations outside their safe range. The attacker first called the add_liquidity() function and made imbalance deposits that pushed the pool’s internal calculations outside their safe range. The pool computed a product term using vb_prod = (prev_vb / vb)^(weight). Because the deposits dwarfed existing balances, this value collapsed toward zero. This caused the pool to miscalculate its internal supply and over-mint yETH LP tokens. The attacker used the excess LP to repeatedly call remove_liquidity and drain LST assets.
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Follow-up: Conduct a follow-up review to ensure that the remediation steps were effective and that the smart contract is now secure.
Follow-up: Conduct a follow-up review to ensure that the remediation steps were effective and that the smart contract is now secure.
In Brief
Remitano suffered a $2.7M loss due to a private key compromise.
GAMBL’s recommendation system was exploited.
DAppSocial lost $530K due to a logic vulnerability.
Rocketswap’s private keys were inadvertently deployed on the server.
Hacks
Hacks Analysis
Huobi | Amount Lost: $8M
On September 24th, the Huobi Global exploit on the Ethereum Mainnet resulted in a $8 million loss due to the compromise of private keys. The attacker executed the attack in a single transaction by sending 4,999 ETH to a malicious contract. The attacker then created a second malicious contract and transferred 1,001 ETH to this new contract. Huobi has since confirmed that they have identified the attacker and has extended an offer of a 5% white hat bounty reward if the funds are returned to the exchange.
