Math Random

How insecure nonce generation with Math.random() happens in Node.js HTTP Digest authentication and how to fix it

A critical vulnerability was discovered in `lib/cam.js` where the HTTP Digest authentication client nonce (cnonce) was generated using `Math.random().toString(36)` — a cryptographically insecure source of randomness. An attacker observing authentication exchanges could predict future cnonce values and forge valid authentication responses. The fix replaces this with `crypto.randomBytes(4).toString('hex')`, providing cryptographically secure random values.