The administrator must ensure the perimeter router is configured to drop all inbound and outbound IPv6 packets containing an extension header with the Endpoint Identification option.

From Perimeter L3 Switch Security Technical Implementation Guide

Part of Endpoint Identification option not filtered

Associated with IA controls: ECSC-1

SV-40432r1_rule The administrator must ensure the perimeter router is configured to drop all inbound and outbound IPv6 packets containing an extension header with the Endpoint Identification option.

Vulnerability discussion

The optional and extensible natures of the IPv6 extension headers require higher scrutiny since many implementations do not always drop packets with headers that it can’t recognize and hence could cause a DoS on the target device. In addition, the type, length, value (TLV) formatting provides the ability for headers to be very large. According to the DoD IPv6 IA Guidance for MO3, headers which may be valid but serve no intended use should not be allowed into or out of any network (S0-C2-opt-3). This option type is associated with the Nimrod Routing system and has no defining RFC document.

Check content

Review the perimeter router or multi-layer switch configuration and determine if filters are bound to the applicable interfaces to drop all inbound and outbound IPv6 packets containing an option type values of 0x8A (Endpoint Identification) regardless of whether it appears in a Hop-by-Hop or Destination Option header.

Fix text

Configure the perimeter router or multi-layer switch to drop all inbound and outbound IPv6 packets containing an option type values of 0x8A (Endpoint Identification) regardless of whether it appears in a Hop-by-Hop or Destination Option header

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