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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-46010r2_rule | 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 |
|---|---|
| SUSE Linux Enterprise Server v11 for System z | 2017-05-18 |
Details
| Check Text ( C-43291r1_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-39374r2_fix) |
|---|
| Edit the SSH daemon configuration and remove any ciphers ending with "cbc". If necessary, add a "Ciphers" line. Restart the SSH daemon. # /sbin/service sshd restart |