STIGQter: STIG Summary: SLES 12 Security Technical Implementation Guide Version: 2 Release: 3 Benchmark Date: 23 Apr 2021:

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

DISA Rule

SV-217270r603956_rule

Vulnerability Number

V-217270

Group Title

SRG-OS-000033-GPOS-00014

Rule Version

SLES-12-030170

Severity

CAT II

CCI(s)

• 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-000366 - The organization implements the security configuration settings.
• CCI-000068 - The information system implements cryptographic mechanisms to protect the confidentiality of remote access sessions.
• CCI-002890 - The information system implements cryptographic mechanisms to protect the integrity of nonlocal maintenance and diagnostic communications.

Weight

10

Fix Recommendation

Edit the SSH daemon configuration (/etc/ssh/sshd_config) and remove any ciphers not starting with "aes" and remove any ciphers ending with "cbc". If necessary, add a "Ciphers" line:

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

Restart the SSH daemon:

# sudo systemctl restart sshd.service

Check Contents

Verify that the SUSE operating system implements DoD-approved encryption to protect the confidentiality of SSH remote connections.

Check the SSH daemon configuration for allowed ciphers with the following command:

# sudo grep -i ciphers /etc/ssh/sshd_config | grep -v '^#'

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-217270

Documentable

False

Rule Version

SLES-12-030170

Severity Override Guidance

Verify that the SUSE operating system implements DoD-approved encryption to protect the confidentiality of SSH remote connections.

Check the SSH daemon configuration for allowed ciphers with the following command:

# sudo grep -i ciphers /etc/ssh/sshd_config | grep -v '^#'

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

4033

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