Use of a broken or weak cryptographic algorithm¶
ID: rb/weak-cryptographic-algorithm Kind: problem Severity: warning Precision: high Tags: - security - external/cwe/cwe-327 Query suites: - ruby-code-scanning.qls - ruby-security-extended.qls - ruby-security-and-quality.qls
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.
Ensure that you use a strong, modern cryptographic algorithm, such as AES-128 or RSA-2048.
The following code uses the
OpenSSL library to encrypt some secret data. When you create a cipher using
OpenSSL 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 stronger modern algorithm.
require 'openssl' class Encryptor attr_accessor :secret_key def encrypt_message_weak(message) cipher = OpenSSL::Cipher.new('des') # BAD: weak encryption cipher.encrypt cipher.key = secret_key cipher.update(message) cipher.final end def encrypt_message_strong(message) cipher = OpenSSL::Cipher::AES128.new # GOOD: strong encryption cipher.encrypt cipher.key = secret_key cipher.update(message) cipher.final end end
NIST, FIPS 140 Annex a: Approved Security Functions.
Common Weakness Enumeration: CWE-327.