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 7 operating system must implement DoD-approved encryption to protect the confidentiality of SSH connections.

DISA Rule

SV-204578r603843_rule

Vulnerability Number

V-204578

Group Title

SRG-OS-000033-GPOS-00014

Rule Version

RHEL-07-040110

Severity

CAT II

CCI(s)

• CCI-000366 - The organization implements the security configuration settings.
• CCI-000803 - The information system implements mechanisms for authentication to a cryptographic module that meet the requirements of applicable federal laws, Executive Orders, directives, policies, regulations, standards, and guidance for such authentication.
• CCI-000068 - The information system implements cryptographic mechanisms to protect the confidentiality of remote access sessions.

Weight

10

Fix Recommendation

Configure SSH to use FIPS 140-2 approved cryptographic algorithms.

Add the following line (or modify the line to have the required value) to the "/etc/ssh/sshd_config" file (this file may be named differently or be in a different location if using a version of SSH that is provided by a third-party vendor).

Ciphers aes256-ctr,aes192-ctr,aes128-ctr

The SSH service must be restarted for changes to take effect.

Check Contents

Verify the operating system uses mechanisms meeting the requirements of applicable federal laws, Executive orders, directives, policies, regulations, standards, and guidance for authentication to a cryptographic module.

The location of the "sshd_config" file may vary if a different daemon is in use.

Inspect the "Ciphers" configuration with the following command:

# grep -i ciphers /etc/ssh/sshd_config
Ciphers aes256-ctr,aes192-ctr,aes128-ctr

If any ciphers other than "aes256-ctr", "aes192-ctr", or "aes128-ctr" are listed, the order differs from the example above, the "Ciphers" keyword is missing, or the returned line is commented out, this is a finding.

Vulnerability Number

V-204578

Documentable

False

Rule Version

RHEL-07-040110

Severity Override Guidance

Verify the operating system uses mechanisms meeting the requirements of applicable federal laws, Executive orders, directives, policies, regulations, standards, and guidance for authentication to a cryptographic module.

The location of the "sshd_config" file may vary if a different daemon is in use.

Inspect the "Ciphers" configuration with the following command:

# grep -i ciphers /etc/ssh/sshd_config
Ciphers aes256-ctr,aes192-ctr,aes128-ctr

If any ciphers other than "aes256-ctr", "aes192-ctr", or "aes128-ctr" are listed, the order differs from the example above, the "Ciphers" keyword is missing, or the returned line is commented out, this is a finding.

Check Content Reference

M

Target Key

2899

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