STIGQter: STIG Summary: Red Hat Enterprise Linux 8 Security Technical Implementation Guide Version: 1 Release: 2 Benchmark Date: 23 Apr 2021:

RHEL 8 must not forward source-routed packets by default.

DISA Rule

SV-230539r627750_rule

Vulnerability Number

V-230539

Group Title

SRG-OS-000480-GPOS-00227

Rule Version

RHEL-08-040250

Severity

CAT II

CCI(s)

• CCI-000366 - The organization implements the security configuration settings.

Weight

10

Fix Recommendation

Configure RHEL 8 to not forward source-routed packets by default with the following commands:

$ sudo sysctl -w net.ipv4.conf.default.accept_source_route=0

$ sudo sysctl -w net.ipv6.conf.default.accept_source_route=0

If "0" is not the system's default value then add or update the following lines in the appropriate file under "/etc/sysctl.d":

net.ipv4.conf.default.accept_source_route=0

net.ipv6.conf.default.accept_source_route=0

Check Contents

Verify RHEL 8 does not accept source-routed packets by default.

Note: If either IPv4 or IPv6 is disabled on the system, this requirement only applies to the active internet protocol version.

Check the value of the accept source route variable with the following command:

$ sudo sysctl net.ipv4.conf.default.accept_source_route net.ipv6.conf.default.accept_source_route

net.ipv4.conf.default.accept_source_route = 0
net.ipv6.conf.default.accept_source_route = 0

If the returned lines do not have a value of "0", a line is not returned, or either returned line is commented out, this is a finding.

Vulnerability Number

V-230539

Documentable

False

Rule Version

RHEL-08-040250

Severity Override Guidance

Verify RHEL 8 does not accept source-routed packets by default.

Note: If either IPv4 or IPv6 is disabled on the system, this requirement only applies to the active internet protocol version.

Check the value of the accept source route variable with the following command:

$ sudo sysctl net.ipv4.conf.default.accept_source_route net.ipv6.conf.default.accept_source_route

net.ipv4.conf.default.accept_source_route = 0
net.ipv6.conf.default.accept_source_route = 0

If the returned lines do not have a value of "0", a line is not returned, or either returned line is commented out, this is a finding.

Check Content Reference

M

Target Key

2921

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