Check: PHTN-67-000110
VMware vSphere 6.7 Photon OS STIG:
PHTN-67-000110
(in versions v1 r6 through v1 r1)
Title
The Photon operating system must use a reverse-path filter for IPv4 network traffic. (Cat II impact)
Discussion
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.
Check Content
At the command line, execute 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
Open /etc/sysctl.conf with a text editor. Add or update the following lines: net.ipv4.conf.all.rp_filter = 1 net.ipv4.conf.default.rp_filter = 1 net.ipv4.conf.eth0.rp_filter = 1 Run the following command to load the new setting: # /sbin/sysctl --load
Additional Identifiers
Rule ID: SV-239181r816668_rule
Vulnerability ID: V-239181
Group Title: SRG-OS-000480-GPOS-00227
Expert Comments
CCIs
Number | Definition |
---|---|
CCI-000366 |
The organization implements the security configuration settings. |
Controls
Number | Title |
---|---|
CM-6 |
Configuration Settings |