Ensure packet fragments are restricted for untrusted interfaces

HochStufe 1Automatisiertcisco-asa

Beschreibung

Sets the security appliance to drop fragmented packets received on the untrusted interface. Attackers use fragmentation to evade security systems such as firewalls or IPS because the checks are usually performed on the first fragment. They can then put malicious payload in the other fragments to perform DoS against internal systems. Audited against the output of 'show running-config' (run 'terminal pager 0' first; 'more system:running-config' also works and shows unmasked secrets).

So wird geprüft

Prüfmethode: Konfigurationsmuster

Muster: (?m)^fragment chain 1 \S+

So wird behoben

Behebungsmethode: Anleitung oder Infrastruktur-Patch

! - Step 1: Acquire the name of the untrusted interface <interface_name> - Step 2: Run the following command to deny fragments on the interface. fragment chain 1 <interface_name>

Eigenschaften

Betriebssysteme: Beliebig
Tags: cisco-asanetworkmanagement-plane
Referenz: CIS Cisco ASA 9.x Firewall Benchmark v1.1.0 - 3.3 Ensure packet fragments are restricted for untrusted interfaces

Diesen Host prüfen

Führen Sie dies auf einem Rechner aus, den Sie prüfen dürfen. Der Scan ist schreibgeschützt.

shell

tmaegis scan --target cisco-asa