CodeQL documentation

Use of a broken or weak cryptographic algorithm

ID: js/weak-cryptographic-algorithm
Kind: path-problem
Severity: warning
Precision: high
Tags:
   - security
   - external/cwe/cwe-327
Query suites:
   - javascript-code-scanning.qls
   - javascript-security-extended.qls
   - javascript-security-and-quality.qls

Click to see the query in the CodeQL repository

Using broken or weak cryptographic algorithms can leave data vulnerable to being decrypted or forged by an attacker.

Many cryptographic algorithms provided by cryptography libraries are known to be weak, or flawed. Using such an algorithm means that encrypted or hashed data is less secure than it appears to be.

Recommendation

Ensure that you use a strong, modern cryptographic algorithm. Use at least AES-128 or RSA-2048 for encryption, and SHA-2 or SHA-3 for secure hashing.

Example

The following code shows an example of using the builtin cryptographic library of NodeJS to encrypt some secret data. When creating a Cipher instance to encrypt the secret data with, you must specify the encryption algorithm to use. The first example uses DES, which is an older algorithm that is now considered weak. The second example uses AES, which is a strong modern algorithm.

const crypto = require('crypto');

var secretText = obj.getSecretText();

const desCipher = crypto.createCipher('des', key);
let desEncrypted = desCipher.write(secretText, 'utf8', 'hex'); // BAD: weak encryption

const aesCipher = crypto.createCipher('aes-128', key);
let aesEncrypted = aesCipher.update(secretText, 'utf8', 'hex'); // GOOD: strong encryption

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