PCI (Payment Card Industry Security Standard)_Req 1.2.1

PCI (Payment Card Industry Security Standard)

Install and maintain a firewall configuration to protect cardholder data

Req 1.2.1

1.2.1 Restrict inbound and outbound traffic to that which is necessary for the cardholder data environment and specifically deny all other traffic.

Examination of all inbound and outbound connections allows for inspection and restriction of traffic based on the source and/or destination address thus preventing unfiltered access between untrusted and trusted environments. This prevents malicious individuals from accessing the entity’s network via unauthorized IP addresses or from using services protocols or ports in an unauthorized manner (for example to send data they’ve obtained from within the entity’s network out to an untrusted server). Implementing a rule that denies all inbound and outbound traffic that is not specifically needed helps to prevent inadvertent holes that would allow unintended and potentially harmful traffic in or out.


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