The Oracle Linux operating system must not have unauthorized IP tunnels configured.
Overview
| Finding ID | Version | Rule ID | IA Controls | Severity |
| V-221893 | OL07-00-040820 | SV-221893r991589_rule | CCI-000366 | medium |
| Description | ||||
| IP tunneling mechanisms can be used to bypass network filtering. If tunneling is required, it must be documented with the Information System Security Officer (ISSO). | ||||
| STIG | Date | |||
| Oracle Linux 7 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 · 3 · disa_xccdf · related
- DISA · 2025-01-23 · disa_cci_list · equivalent
NIST 800-1712 mappings
3.4.1
1.00
- DISA · 3 · 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 · 3 · 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 · 3 · disa_xccdf · related
Details
Check Text (C-221893r991589_chk)
Verify the system does not have unauthorized IP tunnels configured.
Check to see if "libreswan" is installed with the following command:
# yum list installed libreswan
libreswan.x86-64 3.20-5.el7_4
If "libreswan" is installed, check to see if the "IPsec" service is active with the following command:
# systemctl status ipsec
ipsec.service - Internet Key Exchange (IKE) Protocol Daemon for IPsec
Loaded: loaded (/usr/lib/systemd/system/ipsec.service; disabled)
Active: inactive (dead)
If the "IPsec" service is active, check to see if any tunnels are configured in "/etc/ipsec.conf" and "/etc/ipsec.d/" with the following commands:
# grep -iw conn /etc/ipsec.conf /etc/ipsec.d/*.conf
If there are indications that a "conn" parameter is configured for a tunnel, ask the System Administrator if the tunnel is documented with the ISSO.
If "libreswan" is installed, "IPsec" is active, and an undocumented tunnel is active, this is a finding.
Fix Text (F-23597r419752_fix)
Remove all unapproved tunnels from the system, or document them with the ISSO.