Blockaid Exposes EIP-7702 Exploit Vector in Binance Breach
Key Summary
Security telemetry published Wednesday by Blockaid revealed that hackers utilized Ethereum EIP-7702 wallet features during the October 29 Binance security incident, routing permissions through a series of forged authorizations to drain user funds.
Key Bullets
- Security firm Blockaid confirmed attackers exploited Ethereum EIP-7702 wallet features during the recent Binance exploit to connect compromised accounts to draining contracts.
- Exchange telemetry published by Binance put the total scale of the security incident at $6.30B, with $3.00B in stolen assets successfully frozen.
- Attackers brute-forced the target nonce by submitting 50 distinct authorization variations in a single transaction until one matched the active account counter.
- Binance executives confirmed the firm will cover all resulting user losses and promised a detailed technical breakdown upon investigation closure.
Blockaid Exposes EIP-7702 Exploit Method
Security firm Blockaid stated Wednesday that an attacker leveraged Ethereum EIP-7702 wallet features to bridge a Binance account directly to asset-draining code. Telemetry released by Blockaid detailed how the attacker bypassed standard signature validation protocols.
The vulnerability stems from account delegation mechanics. EIP-7702 permits an Ethereum account to assign execution rights to a smart contract. The affected account delegated operational control to an external contract with pre-configured functions designed to withdraw Ether and standard ERC-20 tokens. Liquidity vanished rapidly. The exploit route granted a specific operator address persistent collection rights over both current balances and incoming deposits.
Brute-Forcing Nonce via Batch Transactions
According to on-chain transaction logs analyzed by Blockaid, the attacker lacked the precise wallet account counter at the exact moment of execution. The attacker deployed 50 authorization variations within a single transaction payload. One authorization successfully matched the target account counter when the transaction hit the blockchain. The exploit vector triggered instantly. The attacker secured the necessary cryptographic alignment to route stolen funds away from exchange cold and hot wallets.
Active wallets feature continuously shifting counters that reject mismatched execution signatures. By flooding the mempool with sequential variations, the malicious transaction bypassed timing constraints. The exploit succeeded through raw persistence.
Binance Confirms Billions in Frozen Assets
Security disclosures issued Wednesday by Binance put the total valuation of the security incident at $6.30B. Exchange compliance teams confirmed that $3.00B in affected assets were successfully frozen across multiple liquidity pools and CEX venues. Preliminary internal investigations pointed toward a compromised engineering laptop that allowed unauthorized internal access.
Binance representatives confirmed the company will cover all user losses directly from corporate reserves. Executives promised a complete technical post-mortem once forensic accounting teams finish analyzing the breach vectors.
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