TOSS must not accept router advertisements on all IPv6 interfaces.
Overview
| Finding ID | Version | Rule ID | IA Controls | Severity |
| V-253121 | TOSS-04-040800 | SV-253121r991589_rule | CCI-000366 | medium |
| Description | ||||
| Routing protocol daemons are typically used on routers to exchange network topology information with other routers. If this software is used when not required, system network information may be unnecessarily transmitted across the network. An illicit router advertisement message could result in a man-in-the-middle attack. | ||||
| STIG | Date | |||
| Tri-Lab Operating System Stack (TOSS) 4 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 · 2 · disa_xccdf · related
- DISA · 2025-01-23 · disa_cci_list · equivalent
NIST 800-1712 mappings
3.4.1
1.00
- DISA · 2 · 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 · 2 · 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 · 2 · disa_xccdf · related
Details
Check Text (C-253121r991589_chk)
Verify TOSS does not accept router advertisements on all IPv6 interfaces, unless the system is a router.
Note: If IPv6 is disabled on the system, this requirement is Not Applicable.
Check to see if router advertisements are not accepted by using the following command:
$ sudo sysctl net.ipv6.conf.all.accept_ra
net.ipv6.conf.all.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-56524r825034_fix)
Configure TOSS to not accept router advertisements on all IPv6 interfaces unless the system is a router with the following commands:
$ sudo sysctl -w net.ipv6.conf.all.accept_ra=0
If "0" is not the system's default value then add or update the following lines in the appropriate file under "/etc/sysctl.d":
net.ipv6.conf.all.accept_ra=0