CCE-91945-6| Platform: cpe:/o:ubuntu:ubuntu_linux:16.04 | Date: (C)2018-07-09 (M)2023-07-04 |
This setting prevents the system from accepting ICMP redirects. ICMP redirects tell the system about alternate routes for sending traffic.
Rationale:
It is recommended that systems not accept ICMP redirects as they could be tricked into routing traffic to compromised machines. Setting hard routes within the system (usually a single default route to a trusted router) protects the system from bad routes.
Parameter:
[no/yes]
Technical Mechanism:
Set the net.ipv6.conf.all.accept_redirects and net.ipv6.conf.default.accept_redirects parameters to 0 in /etc/sysctl.conf:
net.ipv6.conf.all.accept_redirects=0 net.ipv6.conf.default.accept_redirects=0
Modify active kernel parameters to match:
# /sbin/sysctl -w net.ipv6.conf.all.accept_redirects=0
# /sbin/sysctl -w net.ipv6.conf.default.accept_redirects=0
# /sbin/sysctl -w net.ipv6.route.flush=1
| CCSS Severity: | CCSS Metrics: |
| CCSS Score : 8.2 | Attack Vector: NETWORK |
| Exploit Score: 3.9 | Attack Complexity: LOW |
| Impact Score: 4.2 | Privileges Required: NONE |
| Severity: HIGH | User Interaction: NONE |
| Vector: AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:H | Scope: UNCHANGED |
| | Confidentiality: LOW |
| | Integrity: NONE |
| | Availability: HIGH |
| | |
References: | Resource Id | Reference |
|---|
| SCAP Repo OVAL Definition | oval:org.secpod.oval:def:46206 |
