CWE-209 (通过错误消息导致的信息暴露) — Vulnerability Class 349

CWE-209 represents a critical information disclosure weakness where software inadvertently exposes sensitive internal details through error messages. This flaw typically occurs when applications return verbose stack traces, database paths, or user-specific data to end-users during failure states. Attackers exploit this by triggering specific errors to gather reconnaissance information, such as server architecture, file structures, or valid user identifiers, which facilitates further targeted attacks like SQL injection or privilege escalation. To mitigate this risk, developers must implement robust error handling mechanisms that separate internal diagnostic logs from user-facing messages. By standardizing generic, non-descriptive error responses for external users while retaining detailed logs for internal debugging, organizations can prevent attackers from leveraging error output to map system vulnerabilities or compromise sensitive data integrity.