The AIX SSH daemon must be configured to only use FIPS 140-2 approved ciphers.
Overview
| Finding ID | Version | Rule ID | IA Controls | Severity |
| V-215402 | AIX7-00-003100 | SV-215402r958408_rule | CCI-000068 | medium |
| Description | ||||
| Without confidentiality protection mechanisms, unauthorized individuals may gain access to sensitive information via a remote access session. Remote access is access to DoD nonpublic information systems by an authorized user (or an information system) communicating through an external, non-organization-controlled network. Remote access methods include, for example, dial-up, broadband, and wireless. Encryption provides a means to secure the remote connection to prevent unauthorized access to the data traversing the remote access connection (e.g., RDP), thereby providing a degree of confidentiality. The encryption strength of a mechanism is selected based on the security categorization of the information. | ||||
| STIG | Date | |||
| IBM AIX 7.x Security Technical Implementation Guide | 2024-08-16 | |||
Details
Check Text (C-215402r958408_chk)
Check the SSH daemon configuration for allowed ciphers by running the following command:
# grep -i ciphers /etc/ssh/sshd_config | grep -v '^#'
The above command should yield the following output:
Ciphers aes128-ctr,aes192-ctr,aes256-ctr
If any of the following conditions are true, this is a finding.
1. No line is returned (default ciphers);
2. The returned ciphers list contains any cipher not starting with aes;
3. The returned ciphers list contains any cipher ending with cbc.
Fix Text (F-16598r294658_fix)
Edit the "/etc/ssh/sshd_config" file and add or edit a "Ciphers" line like this:
Ciphers aes128-ctr,aes192-ctr,aes256-ctr
Restart the SSH daemon:
# stopsrc -s sshd
# startsrc -s sshd