CWE-571 (表达式永真) — Vulnerability Class 1

CWE-571 represents a logical error weakness where a conditional expression permanently evaluates to true, regardless of input or state. This flaw typically arises from incorrect boolean logic, such as using the assignment operator instead of equality comparison, or redundant conditions that mask actual security checks. Attackers exploit this by bypassing critical authentication or authorization mechanisms, gaining unauthorized access to sensitive resources or executing privileged operations without proper verification. To prevent this, developers must rigorously review conditional statements, ensuring logical operators are correctly applied and conditions accurately reflect intended business logic. Utilizing static analysis tools can help detect these tautologies early in the development cycle, while thorough code reviews and unit testing verify that security controls function as expected under all possible execution paths.