Ethereum
RedSonic Vault Loses 9.25 ETH in Flash Loan Exploit
A permissionless asset registration flaw in Ethereum's RedSonic Vault enabled an attacker to extract 9.25 ETH using a flash loan.
Ethereum-based RedSonic Vault was drained of approximately 9.25 ETH in a single-transaction flash loan attack, according to security firm ExVulSec.
The attacker secured 1,139 WETH from Balancer to fund the exploit without requiring upfront personal capital. The attack took advantage of a pricing vulnerability where the vault's share valuation function calculated prices directly from raw stETH balances rather than tracking minting and burning events.
According to ExVulSec, the vault's asset registration function lacked access restrictions, allowing the attacker to register stETH as a secondary share class. This allowed the same underlying collateral to be double-counted. After depositing 1,130 ETH to claim nearly 99% of outstanding shares, the attacker inflated the value and repaid the flash loan within a self-destructing smart contract.
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