The network device must be configured to ensure IPv6 Site Local Unicast addresses are not defined in the enclave, (FEC0::/10). Note that this consist of all addresses that begin with FEC, FED, FEE and FEF.

Overview

Finding ID	Version	Rule ID	IA Controls	Severity
V-14693	NET-IPV6-025	SV-15397r2_rule	ECSC-1	Medium

Description
As currently defined, site local addresses are ambiguous and can be present in multiple sites. The address itself does not contain any indication of the site to which it belongs. The use of site-local addresses has the potential to adversely affect network security through leaks, ambiguity and potential misrouting, as documented in section 2 of RFC3879. RFC3879 formally deprecates the IPv6 site-local unicast prefix defined in RFC3513, i.e., 1111111011 binary or FEC0::/10.

Description

As currently defined, site local addresses are ambiguous and can be present in multiple sites. The address itself does not contain any indication of the site to which it belongs. The use of site-local addresses has the potential to adversely affect network security through leaks, ambiguity and potential misrouting, as documented in section 2 of RFC3879. RFC3879 formally deprecates the IPv6 site-local unicast prefix defined in RFC3513, i.e., 1111111011 binary or FEC0::/10.

STIG	Date
Perimeter Router Security Technical Implementation Guide Cisco	2017-06-27

Details

Check Text ( C-12864r2_chk )
Review the device configuration to ensure FEC0::/10 IP addresses are not defined. If FEC0::/10 IP addresses are defined, this is a finding.

Fix Text (F-14158r1_fix)
Configure the device using authorized IP addresses.