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

The RHEL 8 SSH daemon must not allow authentication using known host’s authentication.

DISA Rule

SV-230290r627750_rule

Vulnerability Number

V-230290

Group Title

SRG-OS-000480-GPOS-00227

Rule Version

RHEL-08-010520

Severity

CAT II

CCI(s)

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

Weight

10

Fix Recommendation

Configure the SSH daemon to not allow authentication using known host’s authentication.

Add the following line in "/etc/ssh/sshd_config", or uncomment the line and set the value to "yes":

IgnoreUserKnownHosts yes

The SSH daemon must be restarted for the changes to take effect. To restart the SSH daemon, run the following command:

$ sudo systemctl restart sshd.service

Check Contents

Verify the SSH daemon does not allow authentication using known host’s authentication with the following command:

$ sudo grep -i IgnoreUserKnownHosts /etc/ssh/sshd_config

IgnoreUserKnownHosts yes

If the value is returned as "no", the returned line is commented out, or no output is returned, this is a finding.

Vulnerability Number

V-230290

Documentable

False

Rule Version

RHEL-08-010520

Severity Override Guidance

Verify the SSH daemon does not allow authentication using known host’s authentication with the following command:

$ sudo grep -i IgnoreUserKnownHosts /etc/ssh/sshd_config

IgnoreUserKnownHosts yes

If the value is returned as "no", the returned line is commented out, or no output is returned, this is a finding.

Check Content Reference

M

Target Key

2921

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