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The SSH daemon must be configured to not use CBC ciphers.
Overview
| Finding ID | Version | Rule ID | IA Controls | Severity |
|---|---|---|---|---|
| V-22459 | GEN005506 M6 | SV-39364r1_rule | ECSC-1 | Medium |
| Description |
|---|
| The Cipher-Block Chaining (CBC) mode of encryption as implemented in the SSHv2 protocol is vulnerable to chosen plaintext attacks and must not be used. |
| STIG | Date |
|---|---|
| MAC OSX 10.6 Workstation Security Technical Implementation Guide | 2012-01-30 |
Details
| Check Text ( C-38312r1_chk ) |
|---|
| Open a terminal session and enter the following command. grep ciphers /etc/sshd_config If no lines are returned, or the returned ciphers list contains any cipher ending with CBC, this is a finding. |
| Fix Text (F-33601r1_fix) |
|---|
| Open a terminal session and edit the SSH daemon configuration file "/etc/sshd_config" and remove any ciphers ending with "CBC". If necessary, add a Ciphers line. |