The firewall must apply ingress filters to traffic that is inbound to the network through any active external interface.
An XCCDF Rule
Description
<VulnDiscussion>Unrestricted traffic to the trusted networks may contain malicious traffic that poses a threat to an enclave or to other connected networks. Additionally, unrestricted traffic may transit a network, which uses bandwidth and other resources. Firewall filters control the flow of network traffic, ensure the flow of traffic is only allowed from authorized sources to authorized destinations. Networks with different levels of trust (e.g., the Internet) must be kept separated.</VulnDiscussion><FalsePositives></FalsePositives><FalseNegatives></FalseNegatives><Documentable>false</Documentable><Mitigations></Mitigations><SeverityOverrideGuidance></SeverityOverrideGuidance><PotentialImpacts></PotentialImpacts><ThirdPartyTools></ThirdPartyTools><MitigationControl></MitigationControl><Responsibility></Responsibility><IAControls></IAControls>
- ID
- SV-206703r855865_rule
- Severity
- Medium
- References
- Updated
Remediation - Manual Procedure
Configure a security policy to each inbound zone and/or interface to implement continuous filtering of outbound traffic.
Apply security policy zones/interfaces through which inbound traffic flows from untrusted external networks or subnetworks.
Configure the ingress filters for the management interface to block all transit traffic (i.e., any traffic not destined to the firewall itself) and so that traffic accessing the firewall originates from the NOC.