The Cisco BGP router must be configured to use a unique key for each autonomous system (AS) that it peers with.
An XCCDF Rule
Description
<VulnDiscussion>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.</VulnDiscussion><FalsePositives></FalsePositives><FalseNegatives></FalseNegatives><Documentable>false</Documentable><Mitigations></Mitigations><SeverityOverrideGuidance></SeverityOverrideGuidance><PotentialImpacts></PotentialImpacts><ThirdPartyTools></ThirdPartyTools><MitigationControl></MitigationControl><Responsibility></Responsibility><IAControls></IAControls>
- ID
- SV-217008r856463_rule
- Severity
- Medium
- References
- Updated
Remediation - Manual Procedure
Configure the router to use unique keys for each AS that it peers with as shown in the example below.
RP/0/0/CPU0:R2(config)#router bgp n
RP/0/0/CPU0:R2(config-bgp)#neighbor x.1.23.3
RP/0/0/CPU0:R2(config-bgp-nbr)#keychain YYY_KEY_CHAIN
RP/0/0/CPU0:R2(config-bgp-nbr)#neighbor x.1.24.4