Lien Finance was attacked, resulting in a loss of approximately 542000 USD

According to SlowMist Monitoring, the decentralized financial protocol Lien Finance has been attacked, with attackers exploiting vulnerabilities in smart contracts to mint unsecured bond tokens and steal approximately $542000 USD. The attacker forged a new non abnormal BondToken without destroying the corresponding input bond, and exchanged USDC through a pre authorized address, ultimately transferring approximately 542144.63 USDC from the victim address. This incident was caused by a verification flaw in the bond token exchange logic, where attackers bypassed asset collateral constraints and minted unsupported assets.