M2 Exchange, DCF, and Vista Finance Hit by Access Control Flaws, Price Games, and Staking Logic Gaps
M2 Exchange lost $13.7M after an attacker bypassed hot wallet access controls in a closed-source CEX environment. DCF token saw $442K drained through a classic burn-based price manipulation exploit. Vista Finance suffered a $29K loss when its staking logic failed to restrict token usage, allowing a flash loan attacker to burn and mint tokens for profit.
In Brief
DCF Token suffered a $442K price manipulation attack.
M2 Exchange’s access control vulnerability resulted in a $13.7M loss.
Vista Finance’s faulty staking logic resulted in a $29K loss.
Hacks Analysis
DCF Token | Amount Lost: $442K
On November 24th, the DCF token exploit on the BNB chain resulted in a $442K loss due to a price manipulation attack. The root cause of the exploit was that the attacker was able to burn the DCF tokens by using the private _transfer() function reducing the total supply and artificially increasing the token price. The attacker then sold the DCF tokens at the manipulated higher price for profit.
Exploited Contract (on BNB): 0xa7e92345ddf541aa5cf60fee2a0e721c50ca1adb
On October 31st, the M2 Exchange, a centralized exchange (CEX) with a closed-source system, suffered an exploit across multiple chains, resulting in a $13.7M loss. The root cause of the exploit was an access control vulnerability in M2 Exchange’s hot wallet system. The attacker bypassed authorization checks, gaining unauthorized access to customer funds. They quickly drained assets, swapping SHIBA and USDT for ETH. The M2 Exchange acknowledged the incident and recovered part of the stolen funds.
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Compromised M2 Hot Wallet: 0xe26abc37b06b819243b4b104270cc18f7c835fce
One of the Exploited Contracts (SHIB Contract): 0x95aD61b0a150d79219dCF64E1E6Cc01f0B64C4cE
On October 21st, the Vista Finance exploit on the BNB chain resulted in a $29,000 loss due to a flaw in its token contract. The root cause of the exploit was an error in the staking logic. The staking system did not transfer tokens to a separate contract but instead tracked balances locally. The _burn function, used in flash loans, bypassed staking restrictions by subtracting directly from the total balance instead of checking unstaked tokens. The attacker used a flash loan to mint and burn tokens while profiting from token sales. The exploit leveraged this logic gap to enable unauthorized token usage.
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Exploited Contract (on BNB): 0x493361D6164093936c86Dcb35Ad03b4C0D032076
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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.
