V-217008

Discussion

If the same keys are used between eBGP neighbors, the chance of a hacker compromising any of the BGP sessions increases. It is possible that a malicious user exists in one autonomous system who would know the key used for the eBGP session. This user would then be able to hijack BGP sessions with other trusted neighbors.

Check Content

Review the BGP configuration to determine if it is peering with multiple autonomous systems. Interview the ISSM and router administrator to determine if unique keys are being used. 

router bgp n
 address-family ipv4 unicast
 !
 neighbor x.1.23.3
  remote-as y
  keychain YYY_KEY_CHAIN
  ttl-security
  address-family ipv4 unicast
  !
 !
 neighbor x.1.24.4
  remote-as z
  keychain ZZZ_KEY_CHAIN
  ttl-security
  address-family ipv4 unicast
 !
!

If unique keys are not being used, this is a finding.