$6M Stolen: AlexLab, NGFS, XBridge, and YIEDL Compromised by Key Theft and Broken Access Controls
AlexLab lost $4.3M after private key compromise gave control of its bridge. NGFS leaked $191K from an unprotected delegate call. XBridge bled $1.4M via unchecked token listing. YIEDL was drained for $160K due to parameter abuse. Four vectors, same verdict: access control is still broken by default.
In Brief
AlexLab’s private keys were compromised.
NGFS Token was exploited for $191K.
XBridge was targeted in a $1.4M attack.
YIEDL suffered a $160K parameter validation exploit.
Hacks Analysis
AlexLab | Amount Lost: $4.3M
On May 14th, the AlexLab exploit on the BNB network resulted in a $4.3M loss. The root cause of the hack was a compromised private key, allowing the attacker to take control of AlexLab’s XLink bridge. The attacker drained 16 BTBC, 3.3M BSC, and 2.8M SKO tokens. AlexLab confirmed the exploit and offered a bounty of 10% of the stolen funds for their return.
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Exploit Contract (on BNB Chain): 0xb3955302e58fffdf2da247e999cd9755f652b13b
On April 25th, the NGFS Token exploit on the BNB chain resulted in a $191K loss. The root cause was insufficient access control in the NGSFToken contract. The delegateCallReserves function had public visibility and lacked proper restrictions, allowing the attacker to configure the _uniswapV2Proxy variable arbitrarily. The attacker set their contract as a UniSwapV2 proxy via the setProxySync function. Shortly after the NGFS token contract deployment, the attacker manipulated the _uniswapV2Library variable to inflate their balance and swapped tokens for underlying assets.
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Exploit Contract (on BNB Chain): 0xa608985f5b40cdf6862bec775207f84280a91e3a
On April 24th, the XBridge exploit on the Ethereum Mainnet and the BNB chain resulted in a $1.4M loss. The root cause was a lack of regulated access control in the XBridge4 contract. The vulnerable contract allowed anyone to claim ownership of tokens via the listToken() function without verifying the token owner or caller. With ownership, the attacker extracted base tokens using the withdrawTokens() function. The XBridge team acknowledged the exploit.
On April 24th, the YIEDL exploit on the BNB chain resulted in a $160K loss. The root cause was insufficient parameter validation in the SpotVault contract. The attacker first invoked the redeem() function with sharesToRedeem parameter as zero and then injected malicious payloads. This enabled arbitrary token exchanges and allowed redemptions without holding shares. The YIEDL team acknowledged the exploit and stated that their new BSC vault was deployed 17 hours before the exploit.
Exploit Contract (on BNB Chain): 0x4edda16ab4f4cc46b160abc42763ba63885862a4
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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.
