Finding ID | Version | Rule ID | IA Controls | Severity |
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V-7009 | NET0425 | SV-7363r3_rule | High |
Description |
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Only Interior Gateway Protocols (IGPs) use key chains. When configuring authentication for routing protocols that provide key chains, configure two rotating keys with overlapping expiration dates--both with a 180-day or less lifetime. A third key must also be defined with an infinite lifetime. Both of these steps ensure there will always be a key that can be placed into service by all peers. If a time period occurs during which no key is activated, authentication cannot occur; hence, route updates will not occur. The lifetime key should be changed 7 days after successful key rotation and synchronization has occurred with all peers. |
STIG | Date |
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Perimeter Router Security Technical Implementation Guide Cisco | 2017-12-07 |
Check Text ( C-3496r6_chk ) |
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Review the running configuration to determine if key authentication has been defined with an infinite lifetime. If an infinite key has not been configured, this is a finding. OSPFv2 Example interface GigabitEthernet0/1 ip address 10.1.12.2 255.255.255.0 ip ospf authentication key-chain OSPF_KEY key chain OSPF_KEY key 1 key-string WWWWW send-lifetime 16:00:00 Feb 22 2017 16:00:00 Aug 22 2017 accept-lifetime 16:00:00 Feb 22 2017 16:00:00 Aug 22 2017 cryptographic-algorithm hmac-sha-256 key 2 key-string XXXXX send-lifetime 16:00:00 Aug 21 2017 16:00:00 Feb 20 2018 accept-lifetime 16:00:00 Aug 21 2017 16:00:00 Feb 20 2018 cryptographic-algorithm hmac-sha-256 key 99999 key-string YYYYY send-lifetime 15:59:00 Feb 20 2018 infinite accept-lifetime 15:59:00 Feb 20 2018 infinite cryptographic-algorithm hmac-sha-256 Notes: Note: Only Interior Gateway Protocols (IGPs) use key chains. Notes: When using authentication keys, it is imperative the site is in compliance with the NTP policies. The router has to know the time! Notes: Must make this a high number to ensure you have plenty of room to put keys in before it. All subsequent keys will be decremented by one (9998, 9997...). |
Fix Text (F-6611r3_fix) |
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This check is in place to ensure keys do not expire creating a DOS due to adjacencies being dropped and routes being aged out. The recommendation is to use two rotating six month keys with a third key set as infinite lifetime. The lifetime key should be changed 7 days after the rotating keys have expired and redefined. |