The administrator must ensure the perimeter router is configured to drop all inbound and outbound IPv6 packets containing a Hop-by-Hop or Destination Option extension header with an undefined option type.

From Perimeter Router Security Technical Implementation Guide

Part of Not filtering undefined option type.

SV-40447r1_rule The administrator must ensure the perimeter router is configured to drop all inbound and outbound IPv6 packets containing a Hop-by-Hop or Destination Option extension header with an undefined option type.

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, extension headers with an unknown option type value should not be allowed into or out of any network (S0-C2-opt-3).

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 undefined option type value regardless of whether they appear in a Hop-by-Hop or Destination Option header. Undefined values are 0x02, 0x03, 0x06 through 0x89 inclusive, 0x8B through 0xC1 inclusive, 0xC4 through 0xC8 inclusive, and anything greater than 0xC9.

Fix text

Configure the perimeter router or multi-layer switch to drop all inbound and outbound IPv6 packets containing an undefined option type value regardless of whether they appear in a Hop-by-Hop or Destination Option header. Undefined values are 0x02, 0x03, 0x06 through 0x89 inclusive, 0x8B through 0xC1 inclusive, 0xC4 through 0xC8 inclusive, and anything greater than 0xC9.

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