DEXX was drained for $21M after private keys for 12,413 wallets were compromised. MoonHacker lost $320K by failing to validate mToken calls in its vault contract, letting attackers inject malicious tokens. Clipper suffered a $458K hit as low-liquidity pools on Optimism and Base enabled profitable price manipulation.
In Brief
MoonHacker’s access control vulnerability resulted in a $320K loss.
Clipper suffered a $458K price manipulation attack.
On December 23rd, the MoonHacker exploit on Optimism resulted in a $320K loss. The root cause was missing access control in the executeOperation() function of the MoonHacker vault contract. This function facilitates operations like supplying, borrowing, and redeeming tokens by interacting with mToken contracts, representing lending market assets in Moonwell’s ecosystem. However, the mToken parameter was not validated to ensure it belonged to a legitimate Moonwell market, and the function lacked restrictions on who could call it. The attacker was able to feed a malicious contract as the mToken address to drain the vault.
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Exploited Contract (on Optimism): 0x24592ed1ccf9e5ae235e24a932b378891313fb75
On December 1st, the Clipper exploit on the Optimism and Base networks resulted in a $458K loss. The attacker targeted Clipper pools with low balances and low constant product (k) values and manipulated the pool’s state to withdraw more assets than deposited. The low liquidity in Optimism and Base pools allowed minor swaps to significantly affect the pool’s price ratios. This imbalance increased the value of tokens during withdrawals.
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Clipper Optimism Pool Contract: 0x5130f6ce257b8f9bf7fac0a0b519bd588120ed40
Clipper Base Pool Contract: 0xb32d856cad3d2ef07c94867a800035e37241247c
On November 16th, the DEXX exploit on Solana, Ethereum, Base, and BSC resulted in a $21M loss. The root cause was a private key leak that compromised user wallets and enabled unauthorized transactions. The attack compromised 8,338 Solana addresses and 4,075 ETH, Base, BSC addresses. The DEXX team has acknowledged the exploit and offered to allocate 80% of daily platform revenue to reimburse affected users.
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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.
