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

RHEL 8 must disable the use of user namespaces.

DISA Rule

SV-230548r627750_rule

Vulnerability Number

V-230548

Group Title

SRG-OS-000480-GPOS-00227

Rule Version

RHEL-08-040284

Severity

CAT II

CCI(s)

Weight

10

Fix Recommendation

Configure RHEL 8 to disable the use of user namespaces by adding the following line to a file in the "/etc/sysctl.d" directory:

Note: User namespaces are used primarily for Linux containers. If containers are in use, this requirement is not applicable.

user.max_user_namespaces = 0

The system configuration files need to be reloaded for the changes to take effect. To reload the contents of the files, run the following command:

$ sudo sysctl --system

Check Contents

Verify RHEL 8 disables the use of user namespaces with the following commands:

Note: User namespaces are used primarily for Linux containers. If containers are in use, this requirement is not applicable.

$ sudo sysctl user.max_user_namespaces

user.max_user_namespaces = 0

If the returned line does not have a value of "0", or a line is not returned, this is a finding.

Vulnerability Number

V-230548

Documentable

False

Rule Version

RHEL-08-040284

Severity Override Guidance

Verify RHEL 8 disables the use of user namespaces with the following commands:

Note: User namespaces are used primarily for Linux containers. If containers are in use, this requirement is not applicable.

$ sudo sysctl user.max_user_namespaces

user.max_user_namespaces = 0

If the returned line does not have a value of "0", or a line is not returned, this is a finding.

Check Content Reference

M

Target Key

2921

Comments