The network device must log all access control lists (ACL) deny statements.

From Perimeter Router Security Technical Implementation Guide Juniper

Part of Interface ACL deny statements are not logged.

Associated with IA controls: ECSC-1, ECAT-2, ECAT-1

SV-15475r3_rule The network device must log all access control lists (ACL) deny statements.

Vulnerability discussion

Auditing and logging are key components of any security architecture. It is essential for security personnel to know what is being done, attempted to be done, and by whom in order to compile an accurate risk assessment. Auditing the actions on network devices provides a means to recreate an attack, or identify a configuration mistake on the device.

Check content

Review the network device interface ACLs to verify all deny statements are logged. Either the syslog or log action command will satisfy this requirement. JUNOS Example: [edit firewall] family inet { filter NIPRNet-ingress { term first-accept { from { } then accept; } term last-accept { from { destination-address { 131.77.5.32/32; 131.77.5.61/32; } protocol tcp; destination-port http; } then accept; } term default-action { then { syslog; discard; } } } }

Fix text

Configure interface ACLs to log all deny statements.

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.