Check: CISC-RT-000220
Cisco IOS XR Router RTR STIG:
CISC-RT-000220
(in versions v2 r4 through v1 r0.1)
Title
The Cisco router must be configured to produce audit records containing information to establish the source of the events. (Cat II impact)
Discussion
Without establishing the source of the event, 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, security personnel need to know the source of the event. In addition to logging where events occur within the network, the audit records must also identify sources of events such as IP addresses, processes, and node or device names.
Check Content
Review the router configuration to verify that events are logged containing information to establish the source of the events 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 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 layer 2 address of the forwarding device for any packet being dropped. If the router is not configured to produce audit records containing information to establish the source of the events, this is a finding.
Fix Text
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
Additional Identifiers
Rule ID: SV-216751r531087_rule
Vulnerability ID: V-216751
Group Title: SRG-NET-000077-RTR-000001
Expert Comments
CCIs
Number | Definition |
---|---|
CCI-000133 |
The information system generates audit records containing information that establishes the source of the event. |
Controls
Number | Title |
---|---|
AU-3 |
Content Of Audit Records |