The F5 BIG-IP appliance must be configured to filter outbound traffic on all internal interfaces.

Severity	Group ID	Group Title	Version	Rule ID	Date	STIG Version
medium	V-266265	SRG-NET-000364-FW-000032	F5BI-FW-300030	SV-266265r1024583_rule	2024-09-09	1

Description
If outbound communications traffic is not filtered, hostile activity intended to harm other networks or packets from networks destined to unauthorized networks may not be detected and prevented. Access control policies and access control lists implemented on devices, such as firewalls, that 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. This requirement addresses the binding of the egress filter to the interface/zone rather than the content of the egress filter.

Description

If outbound communications traffic is not filtered, hostile activity intended to harm other networks or packets from networks destined to unauthorized networks may not be detected and prevented. Access control policies and access control lists implemented on devices, such as firewalls, that 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. This requirement addresses the binding of the egress filter to the interface/zone rather than the content of the egress filter.

ℹ️ Check
From the BIG-IP GUI: 1. Security. 2. Network Firewall. 3. Policies. 4. <Policy Name> If configured rules in the policy do not filter outbound traffic on all internal interface, this is a finding.

✔️ Fix
From the BIG-IP GUI: 1. Security. 2. Network Firewall. 3. Policies. 4. <Policy Name> 5. Configure rules to using packet headers and packet attributes, including source and destination IP addresses and ports to filter outbound traffic on all internal interfaces.