Back to Blog

bZx安全事件的初步分析

Code Auditing
November 6, 2021

11月5日,bZX协议报告遭遇黑客攻击。攻击者窃取了受影响智能合约中的代币。在对攻击交易进行初步分析后,我们怀疑此次攻击是由于开发者的私钥泄露所致。

攻击过程

攻击过程大致简单。通过调用特权函数 transferOwnership 将受影响智能合约的所有权转移给一个新的合约,例如 0x0acc0e5faa09cb1976237c3a9af3d3d4b2f35fa5。然后,新的合约所有者可以将已授权给该智能合约的所有代币转移到任意地址。

请注意,特权函数 transferOwnership 只能由智能合约的当前所有者调用。事实上,我们发现调用此函数的地址是 0xb7f72028d9b502dc871c444363a7ac5a52546608,这是受影响智能合约的创建者。

我们无法确切知道合约创建者将所有权转移给其他地址的确切原因。然而,我们怀疑这是由于开发者的私钥泄露(或被盗)所致。

结论

总而言之,DApp私钥的安全性对于应用程序的安全性至关重要,特别是对于那些未使用DAO的项目。我们建议项目方可以采用一些新技术,如机密计算和MPC来保护私钥。

关于BlockSec

BlockSec 是一家开创性的区块链安全公司,由一群全球顶尖的安全专家于2021年创立。公司致力于提升新兴Web3世界的安全性和可用性,以促进其大规模采用。为此,BlockSec 提供智能合约和EVM链安全审计服务,用于安全开发和主动阻止威胁的Phalcon平台,用于资金追踪和调查的MetaSleuth平台,以及供Web3开发者在加密世界高效冲浪的MetaSuites扩展。

至今,公司已服务于MetaMask、Uniswap Foundation、Compound、Forta和PancakeSwap等300多家知名客户,并从Matrix Partners、Vitalbridge Capital和Fenbushi Capital等知名投资机构的两轮融资中获得了数千万美元。

官方网站:https://blocksec.com/

官方Twitter账号:https://twitter.com/BlockSecTeam

Sign up for the latest updates
The Decentralization Dilemma: Cascading Risk and Emergency Power in the KelpDAO Crisis
Security Insights

The Decentralization Dilemma: Cascading Risk and Emergency Power in the KelpDAO Crisis

This BlockSec deep-dive analyzes the KelpDAO $290M rsETH cross-chain bridge exploit (April 18, 2026), attributed to the Lazarus Group, tracing a causal chain across three layers: how a single-point DVN dependency enabled the attack, how DeFi composability cascaded the damage through Aave V3 lending markets to freeze WETH liquidity exceeding $6.7B across Ethereum, Arbitrum, Base, Mantle, and Linea, and how the crisis forced decentralized governance to exercise centralized emergency powers. The article examines three parameters that shaped the cascade's severity (LTV, pool depth, and cross-chain deployment count) and provides an exclusive technical breakdown of Arbitrum Security Council's forced state transition, an atomic contract upgrade that moved 30,766 ETH without the holder's signature.

Weekly Web3 Security Incident Roundup | Apr 13 – Apr 19, 2026
Security Insights

Weekly Web3 Security Incident Roundup | Apr 13 – Apr 19, 2026

This BlockSec weekly security report covers four attack incidents detected between April 13 and April 19, 2026, across multiple chains such as Ethereum, Unichain, Arbitrum, and NEAR, with total estimated losses of approximately $310M. The highlighted incident is the $290M KelpDAO rsETH bridge exploit, where an attacker poisoned the RPC infrastructure of the sole LayerZero DVN to fabricate a cross-chain message, triggering a cascading WETH freeze across five chains and an Arbitrum Security Council forced state transition that raises questions about the actual trust boundaries of decentralized systems. Other incidents include a $242K MMR proof forgery on Hyperbridge, a $1.5M signed integer abuse on Dango, and an $18.4M circular swap path exploit on Rhea Finance's Burrowland protocol.

Weekly Web3 Security Incident Roundup | Apr 6 – Apr 12, 2026
Security Insights

Weekly Web3 Security Incident Roundup | Apr 6 – Apr 12, 2026

This BlockSec weekly security report covers four DeFi attack incidents detected between April 6 and April 12, 2026, across Linea, BNB Chain, Arbitrum, Optimism, Avalanche, and Base, with total estimated losses of approximately $928.6K. Notable incidents include a $517K approval-related exploit where a user mistakenly approved a permissionless SquidMulticall contract enabling arbitrary external calls, a $193K business logic flaw in the HB token's reward-settlement logic that allowed direct AMM reserve manipulation, a $165.6K exploit in Denaria's perpetual DEX caused by a rounding asymmetry compounded with an unsafe cast, and a $53K access control issue in XBITVault caused by an initialization-dependent check that failed open. The report provides detailed vulnerability analysis and attack transaction breakdowns for each incident.

Best Security Auditor for Web3

Validate design, code, and business logic before launch. Aligned with the highest industry security standards.

BlockSec Audit