The Juniper router must be configured to drop all fragmented Internet Control Message Protocol (ICMP) packets destined to itself.
An XCCDF Rule
Description
Fragmented ICMP packets can be generated by hackers for denial-of-service (DoS) attacks such as Ping O' Death and Teardrop. It is imperative that all fragmented ICMP packets are dropped.
- ID
- SV-254011r997525_rule
- Version
- JUEX-RT-000390
- Severity
- Medium
- References
- Updated
Remediation Templates
A Manual Procedure
Ensure all routers have their receive path filter configured to drop all fragmented ICMP packets.
set policy-options prefix-list router-addresses-ipv4 <interface IPv4 address>/32
set firewall family inet filter protect_re term 1 from destination-prefix-list router-addresses-ipv4
set firewall family inet filter protect_re term 1 from protocol icmp
set firewall family inet filter protect_re term 1 from is-fragment