The AIX SSH daemon must not allow compression.
Overview
| Finding ID | Version | Rule ID | IA Controls | Severity |
| V-215296 | AIX7-00-002113 | SV-215296r991589_rule | Medium |
| Description |
| If compression is allowed in an SSH connection prior to authentication, vulnerabilities in the compression software could result in compromise of the system from an unauthenticated connection, potentially with root privileges. |
| STIG | Date |
| IBM AIX 7.x Security Technical Implementation Guide | 2024-08-16 |
Details
| Check Text (C-16494r922843_chk) |
| Note: If the installed version of OpenSSH is 7.4 or above, this requirement is not applicable. Check the SSH daemon configuration for the Compression setting by running: # grep -i Compression /etc/ssh/sshd_config | grep -v '^#' Compression no If the setting is not present, or it is not set to "no", this is a finding. |
| Fix Text (F-16492r294340_fix) |
| Edit the "/etc/ssh/sshd_config" file and add (or modify) the following line: Compression no Restart the SSH daemon: # stopsrc -s sshd # startsrc -s sshd |