STIGQter STIGQter: STIG Summary: VMware vSphere 8.0 vCenter Appliance Photon OS 4.0 Security Technical Implementation Guide Version: 2 Release: 2 Benchmark Date: 01 Jul 2026:

The Photon operating system must implement only approved ciphers to protect the integrity of remote access sessions.

DISA Rule

SV-258835r991554_rule

Vulnerability Number

V-258835

Group Title

SRG-OS-000250-GPOS-00093

Rule Version

PHTN-40-000079

Severity

CAT I

CCI(s)

Weight

10

Fix Recommendation

Navigate to and open:

/etc/ssh/sshd_config

Ensure the "Ciphers" line is uncommented and set to the following:

Ciphers aes256-gcm@openssh.com,aes128-gcm@openssh.com,aes256-ctr,aes192-ctr,aes128-ctr

At the command line, run the following command:

# systemctl restart sshd.service

Check Contents

At the command line, run the following command to verify the running configuration of sshd:

# sshd -T|&grep -i Ciphers

Expected result:

ciphers aes256-gcm@openssh.com,aes128-gcm@openssh.com,aes256-ctr,aes192-ctr,aes128-ctr

If the output matches the ciphers in the expected result or a subset thereof, this is not a finding.

If the ciphers in the output contain any ciphers not listed in the expected result, this is a finding.

Vulnerability Number

V-258835

Documentable

False

Rule Version

PHTN-40-000079

Severity Override Guidance

At the command line, run the following command to verify the running configuration of sshd:

# sshd -T|&grep -i Ciphers

Expected result:

ciphers aes256-gcm@openssh.com,aes128-gcm@openssh.com,aes256-ctr,aes192-ctr,aes128-ctr

If the output matches the ciphers in the expected result or a subset thereof, this is not a finding.

If the ciphers in the output contain any ciphers not listed in the expected result, this is a finding.

Check Content Reference

M

Target Key

5569