The firewall must establish ingress filters that block inbound packets where the destination is an IP address assigned to the management or loopback addresses of the enclave protection devices unless the packet has a source address assigned to the management network or network infrastructure.

From Firewall Security Requirements Guide Requirements

Part of SRG-NET-000364-FW-000033

Associated with: CCI-002403

SRG-NET-000364-FW-000033_rule The firewall must establish ingress filters that block inbound packets where the destination is an IP address assigned to the management or loopback addresses of the enclave protection devices unless the packet has a source address assigned to the management network or network infrastructure.

Vulnerability discussion

The firewall must reject requests for access or services where the source address received by the firewall specifies a loopback address. The loopback address is used by an Inter-Processor Control (IPC) mechanism that enables the client and server portion of an application running on the same machine to communicate, and so it is trusted. It should never be used as the source IP address of an inbound or outbound transmission.It is a best practice for the management network to use the loopback addresses.

Check content

Review the device configuration to determine if filters are in place to block loopback addresses. Verify packets with a destination IP address assigned to the management or loopback address range are blocked (unless the packet has a source address assigned to the management network or network infrastructure). If loopback addresses are not being blocked by an ingress firewall filter, this is a finding.

Fix text

Establish ingress filters to block any attempt from the firewall or any network to pass any packets claiming to be from a loopback address.

Pro Tips

Lavender hyperlinks in small type off to the right (of CSS class id, if you view the page source) point to globally unique URIs for each document and item. Copy the link location and paste anywhere you need to talk unambiguously about these things.

You can obtain data about documents and items in other formats. Simply provide an HTTP header Accept: text/turtle or Accept: application/rdf+xml.

Powered by sagemincer