The operating system must employ a deny-all, allow-by-exception firewall policy for allowing connections to other systems.

From General Purpose Operating System SRG

Associated with: CCI-000366 CCI-002080

SV-70841r1_rule The operating system must employ a deny-all, allow-by-exception firewall policy for allowing connections to other systems.

Vulnerability discussion

Failure to restrict network connectivity only to authorized systems permits inbound connections from malicious systems. It also permits outbound connections that may facilitate exfiltration of DoD data.

Check content

Verify the operating system employs a deny-all, allow-by-exception firewall policy for allowing connections to other systems. If it does not, this is a finding.

Fix text

Configure the operating system to employ a deny-all, allow-by-exception firewall policy for allowing connections to other systems.

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