Usage of weak hashing library (CRC32)

• Rule ID: python_lang_weak_hash_crc32
• Languages: python
• Source: weak_hash_crc32.yml

Description

The use of CRC32 for hashing is insecure. CRC32 is designed for error-checking and not for security purposes, making it vulnerable to intentional data tampering.

Remediations

• Do not use CRC32 for hashing when security is a concern. It is not secure against intentional data modifications.

  myhash = zlib.crc32(data) # unsafe

• Do opt for stronger hashing algorithms like SHA-256 to ensure data integrity and security.

  myhash = hashlib.sha256(data).digest()

Associated CWE

• CWE-328: Use of Weak Hash

OWASP Top 10

• A02:2021 - Cryptographic Failures

Configuration

To skip this rule during a scan, use the following flag

bearer scan /path/to/your-project/ --skip-rule=python_lang_weak_hash_crc32

To run only this rule during a scan, use the following flag

bearer scan /path/to/your-project/ --only-rule=python_lang_weak_hash_crc32