Defined Approach Requirements
1.4.5 The disclosure of internal IP addresses and routing information is limited to only authorized parties.
Customized Approach Objective
Internal network information is protected from unauthorized disclosure.
Applicability Notes
[No detail is provided here in the PCI DSS 4.0]
Defined Approach Testing Procedures
1.4.5.a Examine configurations of NSCs to verify that the disclosure of internal IP addresses and routing information is limited to only authorized parties.
1.4.5.b Interview personnel and examine documentation to verify that controls are implemented such that any disclosure of internal IP addresses and routing information is limited to only authorized parties.
Purpose of requirement and procedures
Restricting the disclosure of internal, private, and local IP addresses is useful to prevent a hacker from obtaining knowledge of these IP addresses and using that information to access the network.
Good practice
Methods used to meet the intent of this requirement may vary, depending on the specific networking technology being used. For example, the controls used to meet this requirement may be different for IPv4 networks than for IPv6 networks.
Examples
Methods to obscure IP addressing may include, but are not limited to:
• IPv4 Network Address Translation (NAT).
• Placing system components behind proxy servers/NSCs.
• Removal or filtering of route advertisements for internal networks that use registered addressing.
• Internal use of RFC 1918 (IPv4) or use IPv6 privacy extension (RFC 4941) when initiating outgoing sessions to the internet.
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/