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XCCDF
Cisco IOS XE Router RTR Security Technical Implementation Guide
SRG-NET-000362-RTR-000124
SRG-NET-000362-RTR-000124
An XCCDF Group - A logical subset of the XCCDF Benchmark
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SRG-NET-000362-RTR-000124
1 Rule
<GroupDescription></GroupDescription>
The Cisco BGP router must be configured to enable the Generalized TTL Security Mechanism (GTSM).
Low Severity
<VulnDiscussion>As described in RFC 3682, GTSM is designed to protect a router's IP-based control plane from denial of service (DoS) attacks. Many attacks focused on CPU load and line-card overload can be prevented by implementing GTSM on all Exterior Border Gateway Protocol-speaking routers. GTSM is based on the fact that the vast majority of control plane peering is established between adjacent routers; that is, the Exterior Border Gateway Protocol peers are either between connecting interfaces or between loopback interfaces. Since TTL spoofing is considered nearly impossible, a mechanism based on an expected TTL value provides a simple and reasonably robust defense from infrastructure attacks based on forged control plane traffic.</VulnDiscussion><FalsePositives></FalsePositives><FalseNegatives></FalseNegatives><Documentable>false</Documentable><Mitigations></Mitigations><SeverityOverrideGuidance></SeverityOverrideGuidance><PotentialImpacts></PotentialImpacts><ThirdPartyTools></ThirdPartyTools><MitigationControl></MitigationControl><Responsibility></Responsibility><IAControls></IAControls>