Defined Approach Requirements
1.4.3 Anti-spoofing measures are implemented to detect and block forged source IP addresses from entering the trusted network.
Customized Approach Objective
Packets with forged IP source addresses cannot enter a trusted network.
Applicability Notes
[No detail is provided here in the PCI DSS 4.0]
Defined Approach Testing Procedures
1.4.3 Examine vendor documentation and configurations for NSCs to verify that anti-spoofing measures are implemented to detect and block forged source IP addresses from entering the trusted network.
Purpose of requirement and procedures
Filtering packets coming into the trusted network helps to, among other things, ensure packets are not “spoofed” to appear as if they are coming from an organization’s own internal network. For example, anti-spoofing measures prevent internal addresses originating from the Internet from passing into the DMZ.
Good practice
Products usually come with anti-spoofing set as a default and may not be configurable. Entities should consult the vendor’s documentation for more information.
Examples
Normally, a packet contains the IP address of the computer that originally sent it so other computers in the network know where the packet originated.
Malicious individuals will often try to spoof (or imitate) the sending IP address to fool the target system into believing the packet is from a trusted source.
Definitions
[No detail is provided here in the PCI DSS 4.0]
Note: This sub-requirement requirement falls within the primary PCI DSS Requirement 1: Install and Maintain Network Security Controls and secondary requirement 1.4 Network connections between trusted and untrusted networks are controlled..
What is the PCI DSS
The Payment Card Industry Data Security Standard (PCI DSS) is a set of security standards formed in 2004 by Visa, MasterCard, Discover Financial Services, JCB International and American Express. Governed by the Payment Card Industry Security Standards Council (PCI SSC), the compliance scheme aims to secure credit and debit card transactions against data theft and fraud.
While the PCI SSC has no legal authority to compel compliance, it is a requirement for any business that processes credit or debit card transactions. PCI certification is also considered the best way to safeguard sensitive data and information, thereby helping businesses build long lasting and trusting relationships with their customers.
Source: https://www.imperva.com/learn/data-security/pci-dss-certification/
What is the PCI SSC
The PCI SSC mission is to enhance global payment account data security by developing standards and supporting services that drive education, awareness, and effective implementation by stakeholders. We achieve this with a strategic framework to guide our decision-making process and ensure that every initiative is aligned with our mission and supports the needs of the global payments industry.
The four pillars of our strategic framework include:
- Increase industry participation and knowledge in the PCI Standards development process and stakeholder support for standards implementation. This ensures that standards and resources reflect and address industry needs and challenges.
- Evolve security standards and validation programs to support a range of environments, technologies and methodologies for achieving security. This ensures standards and resources that support and enable safe commerce and the flexibility to use different approaches to meet those standards.
- Secure emerging payment channels via development of PCI Standards and resources to support broader payment acceptance. This enables safe commerce in new and emerging card and card-based payment channels such as mobile and internet-of-things.
- Increase standards alignment and consistency of PCI Standards to minimize redundancy and support effective implementation.
PCI DSS certification
PCI certification ensures the security of card data at your business through a set of requirements established by the PCI SSC. These include a number of commonly known best practices, such as:
- Installation of firewalls
- Encryption of data transmissions
- Use of anti-virus software
Source: https://www.imperva.com/learn/data-security/pci-dss-certification/
You can learn more about the PCI DSS at https://www.pcisecuritystandards.org/