The Photon operating system must use a reverse-path filter for IPv4 network traffic.
Overview
| Finding ID | Version | Rule ID | IA Controls | Severity |
| V-256573 | PHTN-30-000104 | SV-256573r991589_rule | CCI-000366 | medium |
| Description | ||||
| Enabling reverse path filtering drops packets with source addresses that should not have been able to be received on the interface they were received on. It should not be used on systems that are routers for complicated networks but is helpful for end hosts and routers serving small networks. | ||||
| STIG | Date | |||
| VMware vSphere 7.0 vCenter Appliance Photon OS Security Technical Implementation Guide | 2024-12-16 | |||
Related Frameworks
4 paths across 3 frameworks
Related Frameworks
NIST 800-531 mapping
CM-6
1.00
- DISA · V1R4 · disa_xccdf · related
- DISA · 2025-01-23 · disa_cci_list · equivalent
NIST 800-1712 mappings
3.4.1
1.00
- DISA · V1R4 · 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 · V1R4 · 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 · V1R4 · disa_xccdf · related
Details
Check Text (C-256573r991589_chk)
At the command line, run the following command:
# /sbin/sysctl -a --pattern "net.ipv4.conf.(all|default|eth.*)\.rp_filter"
Expected result:
net.ipv4.conf.all.rp_filter = 1
net.ipv4.conf.default.rp_filter = 1
net.ipv4.conf.eth0.rp_filter = 1
If the output does not match the expected result, this is a finding.
Note: The number of "ethx" lines returned is dependent on the number of interfaces. Every "ethx" entry must be set to "1".
Fix Text (F-60191r887392_fix)
At the command line, run the following command:
# for SETTING in $(/sbin/sysctl -aN --pattern "net.ipv4.conf.(all|default|eth.*)\.rp_filter"); do sed -i -e "/^${SETTING}/d" /etc/sysctl.conf;echo $SETTING=1>>/etc/sysctl.conf; done
# /sbin/sysctl --load