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

Overview

Finding ID	Version	Rule ID	IA Controls	Severity
V-227893	GEN005505	SV-227893r603855_rule		Medium

Description
DoD information systems are required to use FIPS 140-2 approved ciphers. SSHv2 ciphers meeting this requirement are 3DES and AES. By specifying a cipher list with the order of ciphers being in a “strongest to weakest” orientation, the system will automatically attempt to use the strongest cipher for securing SSH connections. Satisfies: SRG-OS-000033, SRG-OS-000505, SRG-OS-000555

STIG	Date
Solaris 10 X86 Security Technical Implementation Guide	2022-09-07

Details

Check Text ( C-30055r622317_chk )
Check the SSH daemon configuration for allowed ciphers. # 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 is commented out, this is a finding.

Fix Text (F-30043r622318_fix)
Edit /etc/ssh/sshd_config and change or set the Ciphers line to the following. Ciphers aes256-ctr, aes192-ctr, aes128-ctr