STIGQter: STIG Summary: SUSE Linux Enterprise Server 15 Security Technical Implementation Guide Version: 2 Release: 8 Benchmark Date: 01 Jul 2026:

The SUSE operating system SSH server must be configured to use only FIPS-validated key exchange algorithms.

DISA Rule

SV-255920r991554_rule

Vulnerability Number

V-255920

Group Title

SRG-OS-000250-GPOS-00093

Rule Version

SLES-15-040450

Severity

CAT II

CCI(s)

CCI-001453 - Implement cryptographic mechanisms to protect the integrity of remote access sessions.

Weight

Fix Recommendation

Configure the SSH server to use only FIPS-validated key exchange algorithms by adding or modifying the following line in "/etc/ssh/sshd_config":

KexAlgorithms ecdh-sha2-nistp256,ecdh-sha2-nistp384,ecdh-sha2-nistp521,diffie-hellman-group-exchange-sha256

Restart the "sshd" service for changes to take effect:

$ sudo systemctl restart sshd

Check Contents

Verify the SSH server is configured to use only FIPS-validated key exchange algorithms:

> sudo /usr/sbin/sshd -dd 2>&1 | awk '/filename/ {print $4}' | tr -d '\r' | tr '\n' ' ' | xargs sudo grep -iH '^\s*kexalgorithms'

KexAlgorithms ecdh-sha2-nistp256,ecdh-sha2-nistp384,ecdh-sha2-nistp521,diffie-hellman-group-exchange-sha256

If "KexAlgorithms" is not configured, is commented out, or does not contain only the algorithms "ecdh-sha2-nistp256,ecdh-sha2-nistp384,ecdh-sha2-nistp521,diffie-hellman-group-exchange-sha256" in exact order, this is a finding.

Vulnerability Number

V-255920

Documentable

False

Rule Version

SLES-15-040450

Severity Override Guidance

Check Content Reference

Target Key

5274