Check: OL6-00-000082
Oracle Linux 6 STIG:
OL6-00-000082
(in versions v2 r7 through v1 r9)
Title
IP forwarding for IPv4 must not be enabled, unless the system is a router. (Cat II impact)
Discussion
IP forwarding permits the kernel to forward packets from one network interface to another. The ability to forward packets between two networks is only appropriate for systems acting as routers.
Check Content
The status of the "net.ipv4.ip_forward" kernel parameter can be queried by running the following command: $ sysctl net.ipv4.ip_forward The output of the command should indicate a value of "0". If this value is not the default value, investigate how it could have been adjusted at runtime, and verify it is not set improperly in "/etc/sysctl.conf". $ grep net.ipv4.ip_forward /etc/sysctl.conf The ability to forward packets is only appropriate for routers. If the correct value is not returned, this is a finding.
Fix Text
To set the runtime status of the "net.ipv4.ip_forward" kernel parameter, run the following command: # sysctl -w net.ipv4.ip_forward=0 If this is not the system's default value, add the following line to "/etc/sysctl.conf": net.ipv4.ip_forward = 0
Additional Identifiers
Rule ID: SV-208852r793637_rule
Vulnerability ID: V-208852
Group Title: SRG-OS-000480
Expert Comments
CCIs
Number | Definition |
---|---|
CCI-000366 |
The organization implements the security configuration settings. |
Controls
Number | Title |
---|---|
CM-6 |
Configuration Settings |