OL 9 must not accept router advertisements on all IPv6 interfaces by default.
Overview
| Finding ID | Version | Rule ID | IA Controls | Severity |
| V-271881 | OL09-00-006044 | SV-271881r1092355_rule | CCI-000366 | medium |
| Description | ||||
| An illicit router advertisement message could result in a man-in-the-middle attack. | ||||
| STIG | Date | |||
| Oracle Linux 9 Security Technical Implementation Guide | 2025-05-08 | |||
Related Frameworks
4 paths across 3 frameworks
Related Frameworks
NIST 800-531 mapping
CM-6
1.00
- DISA · 1 · disa_xccdf · related
- DISA · 2025-01-23 · disa_cci_list · equivalent
NIST 800-1712 mappings
3.4.1
1.00
- DISA · 1 · disa_xccdf · related
- DISA · 2025-01-23 · disa_cci_list · equivalent
- NIST · Rev 2 (Feb 2020, errata Jan 2021) · nist_800_171_app_d · equivalent
3.4.2
1.00
- DISA · 1 · disa_xccdf · related
- DISA · 2025-01-23 · disa_cci_list · equivalent
- NIST · Rev 2 (Feb 2020, errata Jan 2021) · nist_800_171_app_d · equivalent
CCI1 mapping
CCI-000366
1.00
- DISA · 1 · disa_xccdf · related
Details
Check Text (C-271881r1092355_chk)
Note: If IPv6 is disabled on the system, this requirement is Not Applicable.
Verify that OL 9 does not accept router advertisements on all IPv6 interfaces by default unless the system is a router.
Determine if router advertisements are not accepted by default by using the following command:
$ sysctl net.ipv6.conf.default.accept_ra
net.ipv6.conf.default.accept_ra = 0
If the "accept_ra" value is not "0" and is not documented with the information system security officer (ISSO) as an operational requirement, this is a finding.
Fix Text (F-75838r1092354_fix)
Configure OL 9 to not accept router advertisements on all IPv6 interfaces by default unless the system is a router.
Add or edit the following line in a single system configuration file in the "/etc/sysctl.d/" directory:
net.ipv6.conf.default.accept_ra = 0
Load settings from all system configuration files with the following command:
$ sudo sysctl --system