Improper Validation of Function Hook Arguments

Function hooks are commonly used by security and monitoring software—like antivirus or firewalls—to intercept system or API calls. When these hooks are placed into user-accessible functions without validating the arguments, the protective software itself becomes a target. Attackers can craft malicious inputs that exploit the unvalidated hook logic, potentially disabling the protection or using its privileged access to attack the underlying system. For developers, the core issue is trusting intercepted arguments without applying the same rigorous validation expected of the original function. To prevent this, always validate and sanitize all data processed by a hook with the same rules as the hooked function itself. Treat the hook as a critical gatekeeper, not just a passive observer, to ensure it cannot be manipulated into undermining the very security it's meant to enforce.