Input Validation Failures
Overview
Input Validation Failures occur when software does not properly verify or sanitize input data before processing. This weakness arises from inadequate checks on user-supplied or external data, allowing malformed or malicious input to affect system behavior.
Why It Matters
- Security impact: Can lead to injection attacks, data corruption, unauthorized access, and system compromise.
- Business risk: May result in data breaches, loss of customer trust, regulatory penalties, and financial damage.
- Common consequences: Application crashes, data leakage, privilege escalation, and denial of service.
Where It Appears
- Environments: Web applications, APIs, mobile apps, and embedded systems.
- Systems or processes: User input forms, file uploads, command interpreters, and inter-process communication.
- Typical conditions: Lack of input sanitization, insufficient boundary checks, and failure to enforce data type or format constraints.
How It Is Exploited (High Level)
Attackers supply crafted input that bypasses or exploits weak validation, causing the system to execute unintended commands, disclose sensitive information, or behave unpredictably.
How It Is Addressed (High Level)
Effective input validation involves implementing strict data validation policies, enforcing whitelisting of acceptable input, and applying context-aware sanitization to ensure only safe and expected data is processed.
Related Topics
Injection attacks, buffer overflows, sanitization, data validation, secure coding practices, and input sanitization failures.