Weak Password Hashing Anti-Pattern

Severity: High

Summary

Applications use fast general-purpose hash functions (MD5, SHA-1, SHA-256) without salting for password storage, enabling rapid cracking via rainbow tables or GPU-accelerated brute-force (billions of hashes per second). Results in mass account compromise and credential stuffing attacks.

The Anti-Pattern

The anti-pattern is using cryptographic hash functions that are too fast or lack essential features like salting and adjustable work factors, making them vulnerable to offline attacks.

BAD Code Example

# VULNERABLE: Using MD5 for password hashing.
import hashlib

def hash_password_md5(password):