access-control

Detect access control vulnerabilities in Solidity smart contracts by analyzing code to identify missing modifiers, privilege escalation, tx.origin phishing, incorrect OR/AND logic, and missing two-step transfers. The analysis provides root cause explanations and specific detection patterns for each identified flaw.

Common access control flaws in Web3 security include missing modifiers, unauthorized privilege escalation, tx.origin phishing exploits, incorrect OR/AND permission logic, and missing two-step transfer patterns. These vulnerabilities frequently lead to unauthorized state changes and critical fund loss.

Create a permission matrix for smart contract auditing by mapping contract functions, their sensitivity levels, and required roles. This matrix serves as a core artifact to systematically verify that only authorized users can execute privileged operations and modify state.

tx.origin phishing causes unauthorized access in smart contracts because using tx.origin for authentication allows attackers to trick users into triggering privileged functions through intermediate contracts. Root cause analysis reveals that msg.sender should be used instead to validate the immediate caller.

Scan a DeFi protocol for missing modifiers before deployment by running a comprehensive access control analysis on the Solidity codebase. This process flags functions that allow unauthorized state changes and identifies incorrect permission logic early in the development lifecycle.