Web3 Security

This chapter delves into the critical security risks and vulnerabilities in Web3 smart contracts, emphasizing the importance of robust security measures in the decentralized ecosystem. It begins by examining the transparency of blockchain technologies and the prevalence of security incidents, highlighting that not all threats originate from smart contract vulnerabilities but also from scams, social engineering, and phishing. The chapter then explores the threat actors and attack surfaces in smart contracts, including users, administrators, developers, and various Web2 and blockchain components. It discusses common vulnerabilities such as access control issues, arithmetic errors, logic bugs, weak randomness, publicly accessible secrets, front-running, and oracle manipulation. The chapter also covers secure programming practices in Solidity, including the use of trusted libraries like OpenZeppelin Contracts. Additionally, it provides an overview of classification systems like the SWC Registry and EEA EthTrust Security Levels, which help standardize the assessment of smart contract security. The chapter concludes by emphasizing the need for a comprehensive security assessment that covers all aspects of smart contract development, from business logic to documentation.