Check: GEN005506
SUSE Linux Enterprise Server v11 for System z STIG:
GEN005506
(in versions v1 r12 through v1 r9)
Title
The SSH daemon must be configured to not use Cipher-Block Chaining (CBC) ciphers. (Cat II impact)
Discussion
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.
Check Content
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
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
Additional Identifiers
Rule ID: SV-46010r2_rule
Vulnerability ID: V-22459
Group Title: GEN005506
Expert Comments
CCIs
Number | Definition |
---|---|
CCI-000366 |
The organization implements the security configuration settings. |
Controls
Number | Title |
---|---|
CM-6 |
Configuration Settings |