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The SSH daemon must be configured to not use Cipher-Block Chaining (CBC) ciphers.
Overview
| Finding ID | Version | Rule ID | IA Controls | Severity |
|---|---|---|---|---|
| V-22459 | GEN005506 | SV-26752r1_rule | ECSC-1 | Medium |
| Description |
|---|
| The Cipher-Block Chaining (CBC) mode of encryption as implemented in the SSHv2 protocol is vulnerable to chosen-plain text attacks and must not be used. |
| STIG | Date |
|---|---|
| Draft AIX Security Technical Implementation Guide | 2011-08-17 |
Details
| Check Text ( C-27761r1_chk ) |
|---|
| Check the SSH daemon configuration for allowed ciphers. # grep -i ciphers /etc/ssh/sshd_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-24002r1_fix) |
|---|
| Edit the SSH daemon configuration and remove any ciphers ending with cbc. If necessary, add a Ciphers line. |