The Arista router must be configured to drop all fragmented Internet Control Message Protocol (ICMP) packets destined to itself.
An XCCDF Rule
Description
<VulnDiscussion>Fragmented ICMP packets can be generated by hackers for DoS attacks such as Ping O' Death and Teardrop. It is imperative that all fragmented ICMP packets are dropped.</VulnDiscussion><FalsePositives></FalsePositives><FalseNegatives></FalseNegatives><Documentable>false</Documentable><Mitigations></Mitigations><SeverityOverrideGuidance></SeverityOverrideGuidance><PotentialImpacts></PotentialImpacts><ThirdPartyTools></ThirdPartyTools><MitigationControl></MitigationControl><Responsibility></Responsibility><IAControls></IAControls>
- ID
- SV-256017r882393_rule
- Severity
- Medium
- References
- Updated
Remediation - Manual Procedure
Ensure all Arista routers have their receive path filter configured to drop all fragmented ICMP packets.
Step 1: Configure the ACL to filter the fragmented ICMP packets destined to itself.
LEAF-1A(config)#ip access-list ICMP_FRAGMENTS
LEAF-1A(config-acl-ICMP_FRAGMENTS)# 10 deny ip any any fragments