The Juniper perimeter router must be configured to drop IPv6 packets containing a Hop-by-Hop header with invalid option type values.
An XCCDF Rule
Description
<VulnDiscussion>These options are intended to be for the Destination Options header only. The optional and extensible natures of the IPv6 extension headers require higher scrutiny since many implementations do not always drop packets with headers that it cannot recognize and hence could cause a Denial-of-Service on the target device. In addition, the type, length, value (TLV) formatting provides the ability for headers to be very large. </VulnDiscussion><FalsePositives></FalsePositives><FalseNegatives></FalseNegatives><Documentable>false</Documentable><Mitigations></Mitigations><SeverityOverrideGuidance></SeverityOverrideGuidance><PotentialImpacts></PotentialImpacts><ThirdPartyTools></ThirdPartyTools><MitigationControl></MitigationControl><Responsibility></Responsibility><IAControls></IAControls>
- ID
- SV-233295r855914_rule
- Severity
- Medium
- References
- Updated
Remediation - Manual Procedure
Configure the router to drop IPv6 packets containing a Hop-by-Hop header as shown in the example below.
Step 1: Configure a filter to block packets with a Hop-by-Hop header as shown in the example.
user@R1# edit firewall family inet6
user@R1# edit filter IPV6-INGRESS-FILTER
user@R1# set term HOP_BY_HOP_HEADER from next-header hop-by-hop