STIGQter: STIG Summary: Red Hat Enterprise Linux 7 Security Technical Implementation Guide Version: 3 Release: 3 Benchmark Date: 23 Apr 2021:

The Red Hat Enterprise Linux operating system must be configured so that the SSH private host key files have mode 0640 or less permissive.

DISA Rule

SV-204597r603261_rule

Vulnerability Number

V-204597

Group Title

SRG-OS-000480-GPOS-00227

Rule Version

RHEL-07-040420

Severity

CAT II

CCI(s)

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

Weight

10

Fix Recommendation

Configure the mode of SSH private host key files under "/etc/ssh" to "0640" with the following command:

# chmod 0640 /path/to/file/ssh_host*key

Check Contents

Verify the SSH private host key files have mode "0640" or less permissive.

The following command will find all SSH private key files on the system and list their modes:

# find / -name '*ssh_host*key' | xargs ls -lL

-rw-r----- 1 root ssh_keys 668 Nov 28 06:43 ssh_host_dsa_key
-rw-r----- 1 root ssh_keys 582 Nov 28 06:43 ssh_host_key
-rw-r----- 1 root ssh_keys 887 Nov 28 06:43 ssh_host_rsa_key

If any file has a mode more permissive than "0640", this is a finding.

Vulnerability Number

V-204597

Documentable

False

Rule Version

RHEL-07-040420

Severity Override Guidance

Verify the SSH private host key files have mode "0640" or less permissive.

The following command will find all SSH private key files on the system and list their modes:

# find / -name '*ssh_host*key' | xargs ls -lL

-rw-r----- 1 root ssh_keys 668 Nov 28 06:43 ssh_host_dsa_key
-rw-r----- 1 root ssh_keys 582 Nov 28 06:43 ssh_host_key
-rw-r----- 1 root ssh_keys 887 Nov 28 06:43 ssh_host_rsa_key

If any file has a mode more permissive than "0640", this is a finding.

Check Content Reference

M

Target Key

2899

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