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The AIX SSH daemon must not allow compression.
Overview
| Finding ID | Version | Rule ID | IA Controls | Severity |
|---|---|---|---|---|
| V-91705 | AIX7-00-002113 | SV-101803r1_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 | 2019-04-29 |
Details
| Check Text ( C-90859r1_chk ) |
|---|
| 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-97903r1_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 |