The SUSE operating system must not allow interfaces to accept Internet Protocol version 6 (IPv6) Internet Control Message Protocol (ICMP) redirect messages by default.
Overview
| Finding ID | Version | Rule ID | IA Controls | Severity |
| V-235021 | SLES-15-040350 | SV-235021r991589_rule | CCI-000366 | medium |
| Description | ||||
| ICMP redirect messages are used by routers to inform hosts that a more direct route exists for a particular destination. These messages modify the host's route table and are unauthenticated. An illicit ICMP redirect message could result in a man-in-the-middle attack. | ||||
| STIG | Date | |||
| SUSE Linux Enterprise Server 15 Security Technical Implementation Guide | 2025-05-14 | |||
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-235021r991589_chk)
Verify the SUSE operating system does not allow IPv6 ICMP redirect messages by default.
Check the value of the default IPv6 accept_redirects variable with the following command:
> sudo sysctl net.ipv6.conf.default.accept_redirects
net.ipv6.conf.default.accept_redirects = 0
If the network parameter "ipv6.conf.default.accept_redirects" is not equal to "0" or nothing is returned, this is a finding.
Fix Text (F-38172r619333_fix)
Configure the SUSE operating system to not accept IPv6 ICMP redirect messages by default by running the following command as an administrator:
> sudo sysctl -w net.ipv6.conf.default.accept_redirects=0
If "0" is not the system's default value, add or update the following line in "/etc/sysctl.d/99-stig.conf":
> sudo sh -c 'echo "net.ipv6.conf.default.accept_redirects=0" >> /etc/sysctl.d/99-stig.conf'
> sudo sysctl --system