Check: CISC-RT-000030
Cisco IOS XE Router RTR STIG:
CISC-RT-000030
(in versions v2 r8 through v1 r1)
Title
The Cisco router must be configured to use keys with a duration not exceeding 180 days for authenticating routing protocol messages. (Cat II impact)
Discussion
If the keys used for routing protocol authentication are guessed, the malicious user could create havoc within the network by advertising incorrect routes and redirecting traffic. Some routing protocols allow the use of key chains for authentication. A key chain is a set of keys that is used in succession, with each having a lifetime of no more than 180 days. Changing the keys frequently reduces the risk of them eventually being guessed. Keys cannot be used during time periods for which they are not activated. If a time period occurs during which no key is activated, neighbor authentication cannot occur, and therefore routing updates will fail. Therefore, ensure that for a given key chain, key activation times overlap to avoid any period of time during which no key is activated.
Check Content
This requirement is not applicable for the DODIN Backbone. Review the start times for each key within the configured key chains used for routing protocol authentication as shown in the example below: key chain OSPF_KEY_CHAIN key 1 key-string xxxxxxx send-lifetime 00:00:00 Jan 1 2018 23:59:59 Mar 31 2018 accept-lifetime 00:00:00 Jan 1 2018 01:05:00 Apr 1 2018 key 2 key-string yyyyyyy send-lifetime 00:00:00 Apr 1 2018 23:59:59 Jun 30 2018 accept-lifetime 23:55:00 Mar 31 2018 01:05:00 Jul 1 2018 Note: Key chains must be configured to authenticate routing protocol messages, as it is the only way to set an expiration. If any key has a lifetime of more than 180 days, this is a finding.
Fix Text
This requirement is not applicable for the DODIN Backbone. Configure each key used for routing protocol authentication to have a lifetime of no more than 180 days as shown in the example below: R5(config)#key chain OSPF_KEY_CHAIN R5(config-keychain)#key 1 R5(config-keychain-key)#key-string xxxxxx R5(config-keychain-key)#send-lifetime 00:00:00 Jan 1 2018 23:59:59 Mar 31 2018 R5(config-keychain-key)#accept-lifetime 00:00:00 Jan 1 2018 01:05:00 Apr 1 2018 R5(config-keychain-key)#exit R5(config-keychain)#key 2 R5(config-keychain-key)#key-string yyyyyyy R5(config-keychain-key)#send-lifetime 00:00:00 Apr 1 2018 23:59:59 Jun 30 2018 R5(config-keychain-key)#accept-lifetime 23:55:00 Mar 31 2018 01:05:00 Jul 1 2018 R5(config-keychain-key)#end
Additional Identifiers
Rule ID: SV-216995r877984_rule
Vulnerability ID: V-216995
Group Title: SRG-NET-000230-RTR-000003
Expert Comments
CCIs
Number | Definition |
---|---|
CCI-000366 |
The organization implements the security configuration settings. |
CCI-002205 |
The information system uniquely identifies and authenticates source by organization, system, application, and/or individual for information transfer. |