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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 2016-12-20

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