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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 | 2020-12-04 |
Details
| Check Text ( C-30055r603853_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-30043r603854_fix) |
|---|
| Edit /etc/ssh/sshd_config and change or set the Ciphers line to the following. Ciphers aes256-ctr, aes192-ctr, aes128-ctr |