The Cisco Multicast Source Discovery Protocol (MSDP) router must be configured to limit the amount of source-active messages it accepts on a per-peer basis.
Overview
| Finding ID | Version | Rule ID | IA Controls | Severity |
| V-216822 | CISC-RT-000940 | SV-216822r531087_rule | CCI-001368 | low |
| Description | ||||
| To reduce any risk of a denial-of-service (DoS) attack from a rogue or misconfigured MSDP router, the router must be configured to limit the number of source-active messages it accepts from each peer. | ||||
| STIG | Date | |||
| Cisco IOS XR Router RTR Security Technical Implementation Guide | 2024-08-22 | |||
Related Frameworks
3 paths across 3 frameworks
Related Frameworks
NIST 800-531 mapping
AC-4
1.00
- DISA · 3 · disa_xccdf · related
- DISA · 2025-01-23 · disa_cci_list · equivalent
NIST 800-1711 mapping
3.1.3
1.00
- DISA · 3 · disa_xccdf · related
- DISA · 2025-01-23 · disa_cci_list · equivalent
- NIST · Rev 2 (Feb 2020, errata Jan 2021) · nist_800_171_app_d · equivalent
CCI1 mapping
CCI-001368
1.00
- DISA · 3 · disa_xccdf · related
Details
Check Text (C-216822r531087_chk)
Review the router configuration to determine if it is configured to limit the amount of source-active messages it accepts on a per-peer basis.
router msdp
…
…
…
peer 4.4.4.4
remote-as 33
maximum external-sa 555
!
peer 5.5.5.5
remote-as 44
maximum external-sa 555
!
!
If the router is not configured to limit the source-active messages it accepts, this is a finding.
Fix Text (F-18052r288841_fix)
Configure the router to limit the amount of source-active messages it accepts from each peer.
RP/0/0/CPU0:R2(config)#router msdp
RP/0/0/CPU0:R2(config-msdp)#peer x.14.2.1
RP/0/0/CPU0:R2(config-msdp-peer)#maximum external-sa nnn
RP/0/0/CPU0:R2(config-msdp-peer)#exit
RP/0/0/CPU0:R2(config-msdp)#peer x.15.3.5
RP/0/0/CPU0:R2(config-msdp-peer)#maximum external-sa nnn
RP/0/0/CPU0:R2(config-msdp-peer)#end