8.4 Multi-factor authentication (MFA) is implemented to secure access into the CDE.
This requirement focuses on implementing multi-factor authentication (MFA) to secure access to the cardholder data environment (CDE), ensuring that administrative access and other critical access points require multiple authentication factors for enhanced security.
Sub-requirements:
- 8.4.1 MFA is implemented for all non-console access into the CDE for personnel with administrative access.
- 8.4.2 MFA is implemented for all non-console access into the CDE.
- 8.4.3 MFA is implemented for all remote access originating from outside the entity's network that could access or impact the CDE.
8.4. Authentication factors are protected against unauthorized disclosure and replay.
Ensure all authentication factors (passwords, tokens, biometrics) are securely managed and protected from interception or misuse.
Key Risks
Frequently Asked Questions
How are authentication factors protected?
By encrypting credentials in transit, enforcing strong password policies, and preventing reuse of authentication codes.
Can authentication factors be transmitted in clear text?
No, all authentication factors must be protected using strong cryptography.
What is a replay attack?
A replay attack is when an attacker intercepts and reuses authentication data to gain unauthorized access.
How can replay attacks be prevented?
By using one-time passwords, time-based tokens, and secure transmission protocols.
Why is it important to separate user IDs and authentication factors?
To prevent easy guessing and to enforce strong authentication practices.
Common QSA Questions
Can you show how authentication factors are protected in your systems?
Yes, we use encryption for all authentication traffic and enforce strong password and token management policies.
How do you prevent replay attacks?
We use time-based or one-time authentication codes and monitor for suspicious login attempts.
How do you ensure authentication factors are not reused or predictable?
Our policies prohibit reuse and require complexity for all authentication factors.
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