The Cisco router must be configured to produce audit records containing information to establish where the events occurred.

Overview

Finding ID	Version	Rule ID	IA Controls	Severity
V-216750	CISC-RT-000210	SV-216750r531087_rule		Medium

Description
Without establishing where events occurred, it is impossible to establish, correlate, and investigate the events leading up to an outage or attack. In order to compile an accurate risk assessment and provide forensic analysis, it is essential for security personnel to know where events occurred such as router components, modules, device identifiers, node names, and functionality. Associating information about where the event occurred within the network provides a means of investigating an attack, recognizing resource utilization or capacity thresholds, or identifying an improperly configured router.

Description

Without establishing where events occurred, it is impossible to establish, correlate, and investigate the events leading up to an outage or attack. In order to compile an accurate risk assessment and provide forensic analysis, it is essential for security personnel to know where events occurred such as router components, modules, device identifiers, node names, and functionality. Associating information about where the event occurred within the network provides a means of investigating an attack, recognizing resource utilization or capacity thresholds, or identifying an improperly configured router.

STIG	Date
Cisco IOS XR Router RTR Security Technical Implementation Guide	2020-09-23

Details

Check Text ( C-17982r288639_chk )
Review the router configuration to verify that events are logged containing information to establish where the events occurred as shown in the example below. ipv4 access-list EXTERNAL_ACL_INBOUND 10 permit tcp host x.11.1.1 eq bgp host x.11.1.2 20 permit tcp host x.11.1.1 host x.11.1.2 eq bgp 25 deny icmp any host x.11.1.2 fragments log-input 30 permit icmp host x.11.1.1 host x.11.1.2 echo 40 permit icmp host x.11.1.1 host x.11.1.2 echo-reply 50 deny ipv4 any host x.11.1.1 log-input 60 permit tcp any any established … … … 140 deny ipv4 any any log-input Note: When the log-input parameter is configured on deny statements, the log record will contain the interface where ingress packet has been dropped. If the router is not configured to produce audit records containing information to establish to establish where the events occurred, this is a finding.

Check Text ( C-17982r288639_chk )

Review the router configuration to verify that events are logged containing information to establish where the events occurred as shown in the example below.

ipv4 access-list EXTERNAL_ACL_INBOUND
10 permit tcp host x.11.1.1 eq bgp host x.11.1.2
20 permit tcp host x.11.1.1 host x.11.1.2 eq bgp
25 deny icmp any host x.11.1.2 fragments log-input
30 permit icmp host x.11.1.1 host x.11.1.2 echo
40 permit icmp host x.11.1.1 host x.11.1.2 echo-reply
50 deny ipv4 any host x.11.1.1 log-input
60 permit tcp any any established
…
…
…
140 deny ipv4 any any log-input

Note: When the log-input parameter is configured on deny statements, the log record will contain the interface where ingress packet has been dropped.

If the router is not configured to produce audit records containing information to establish to establish where the events occurred, this is a finding.

Fix Text (F-17980r288640_fix)
Configure the router to log events containing information to establish where the events occurred as shown in the example below. RP/0/0/CPU0:R3(config)#ipv4 access-list EXTERNAL_ACL_INBOUND … … … RP/0/0/CPU0:R3(config-ipv4-acl)#deny ip any any log-input