CCE-95047-7| Platform: cpe:/o:debian:debian_linux:11.x, cpe:/o:ubuntu:ubuntu_linux:20.04, cpe:/o:ubuntu:ubuntu_linux:22.04, cpe:/o:ubuntu:ubuntu_linux:23.04 | Date: (C)2020-10-15 (M)2023-09-01 |
This setting disables the systems ability to accept router advertisements
Rationale:
It is recommended that systems not accept router advertisements 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.
Fix:
Set the net.ipv6.conf.all.accept_ra and net.ipv6.conf.default.accept_ra parameter to 0 in /etc/sysctl.conf and run sysctl -p command:
net.ipv6.conf.all.accept_ra=0 net.ipv6.conf.default.accept_ra=0
Modify active kernel parameters to match:
# /sbin/sysctl -w net.ipv6.conf.all.accept_ra=0
# /sbin/sysctl -w net.ipv6.conf.default.accept_ra=0
# /sbin/sysctl -w net.ipv6.route.flush=1
Parameter:
[no/yes]
Technical Mechanism:
Set the net.ipv6.conf.all.accept_ra and net.ipv6.conf.default.accept_ra parameter to 0 in /etc/sysctl.conf:
net.ipv6.conf.all.accept_ra=0 net.ipv6.conf.default.accept_ra=0
Modify active kernel parameters to match:
# /sbin/sysctl -w net.ipv6.conf.all.accept_ra=0
# /sbin/sysctl -w net.ipv6.conf.default.accept_ra=0
# /sbin/sysctl -w net.ipv6.route.flush=1
| CCSS Severity: | CCSS Metrics: |
| CCSS Score : 5.1 | Attack Vector: LOCAL |
| Exploit Score: 2.5 | Attack Complexity: LOW |
| Impact Score: 2.5 | Privileges Required: NONE |
| Severity: MEDIUM | User Interaction: NONE |
| Vector: AV:L/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:L | Scope: UNCHANGED |
| | Confidentiality: LOW |
| | Integrity: NONE |
| | Availability: LOW |
| | |
References: | Resource Id | Reference |
|---|
| SCAP Repo OVAL Definition | oval:org.secpod.oval:def:92227 |
| SCAP Repo OVAL Definition | oval:org.secpod.oval:def:87304 |
| SCAP Repo OVAL Definition | oval:org.secpod.oval:def:65957 |
| SCAP Repo OVAL Definition | oval:org.secpod.oval:def:85123 |
