The SSH client must be configured to not use CBC-based ciphers.
Overview
| Finding ID | Version | Rule ID | IA Controls | Severity |
|---|---|---|---|---|
| V-22462 | GEN005511 | SV-26755r1_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 |
|---|---|
| Draft AIX Security Technical Implementation Guide | 2011-08-17 |
Details
| Check Text ( C-27764r1_chk ) |
|---|
| Check the SSH client configuration for allowed ciphers. # grep -i ciphers /etc/ssh/ssh_config | grep -v '^#' If no lines are returned, or the returned ciphers list contains any cipher ending with cbc, this is a finding. |
| Fix Text (F-24005r1_fix) |
|---|
| Edit the SSH client configuration and remove any ciphers ending with cbc. If necessary, add a Ciphers line. |