CWE-347 (密码学签名的验证不恰当) — Vulnerability Class 440

CWE-347 represents a critical integrity weakness where software fails to properly validate cryptographic signatures attached to data or code. Attackers typically exploit this flaw by intercepting communications or modifying stored files, substituting legitimate content with malicious payloads that lack valid digital signatures. Because the application accepts these unsigned or tampered inputs as authentic, it executes unauthorized commands or processes corrupted data, potentially leading to complete system compromise or data loss. To prevent this vulnerability, developers must implement rigorous verification routines that strictly check every incoming or processed item against its expected cryptographic signature using trusted public keys. This ensures that any alteration, even a single bit change, is detected and rejected. Additionally, employing secure key management practices and avoiding custom cryptographic implementations further strengthens the system’s defense against signature forgery and tampering attacks.