Examination of desktop firewall configurations to verify that no direct access is allowed between the Internet and endpoints in the CDE |
The risk of allowing direct access between public systems and the endpoints located in the cardholder data environment is firewall protections can be bypassed and endpoints with cardholder data can be compromised. Ensuring that no direct Internet access is allowed to and from the endpoints that store, process or transmit the cardholder data is the key aspect of section 1.3 of PCI DSS.
1.3.4: Allow Only Authorized Outbound Traffic
Examine desktop firewall configurations to verify that outbound traffic is explicitly authorized
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at Microsoft TechNet.