Use of cryptographically weak Pseudo-Random Number Generator (PRNG)

Description

Depending on the context, generating weak random numbers may expose cryptographic functions which rely on these numbers to be exploitable. When generating numbers for sensitive values such as tokens, nonces, and cryptographic keys, it is recommended that the `RandomNumberGenerator` class be used.

Examples

Insecure Code

Random RNG = new Random(); Int32 randInt = RNG.Next(32000);

Secure Code

Int32 randInt = RandomNumberGenerator.GetInt32(32000);

Remediation

Replace the `Random` class with `RandomNumberGenerator` for generating cryptographically secure random numbers.

Rule Details

Field	Value
ID	CODE-0445
Category	Crypto
Severity	MEDIUM
CWE	CWE-338
Confidence	HIGH
Impact	MEDIUM
Likelihood	MEDIUM
Exploitability	MODERATE
Tags	random number generator, cryptographic security
OWASP	A3:2017-Sensitive Data Exposure, A02:2021-Cryptographic Failures

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