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Hyperbridge has released an update regarding the attack incident; the vulnerability stemmed from a flaw in the Merkle proof verification logic.
ME News Report, April 13 (UTC+8), the blockchain interoperability protocol Hyperbridge disclosed details of a previous DOT attack incident, resulting in a loss of approximately $237k. The vulnerability stemmed from the HandlerV1 contract’s VerifyProof() function lacking input validation, failing to check that leaf_index < leafCount, which allowed the attacker to forge Merkle proofs. The attacker used this to gain administrator privileges on the bridged DOT token contract on Ethereum, subsequently minting 1 billion bridged DOT tokens (about 2800 times the legitimate circulating supply of approximately 356k tokens), and cashing out on a decentralized exchange. Hyperbridge stated that they are currently working with security partners to trace the funds, and cross-chain functionality will remain suspended until the investigation is complete. (Source: Foresight News)