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The SSH daemon must not allow compression or must only allow compression after successful authentication.
Overview
| Finding ID | Version | Rule ID | IA Controls | Severity |
|---|---|---|---|---|
| V-22488 | GEN005539 | SV-40723r1_rule | ECSC-1 | 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 |
|---|---|
| AIX 5.3 Security Technical Implementation Guide | 2013-03-26 |
Details
| Check Text ( C-39454r1_chk ) |
|---|
| Check the SSH daemon configuration for the Compression setting. # grep -i Compression /etc/ssh/sshd_config | grep -v '^#' If the setting is present and set to "yes", this is a finding. If the setting is absent or set to "no" or "delayed", this is not a finding. |
| Fix Text (F-34582r1_fix) |
|---|
| Edit the /etc/ssh/sshd_config file and remove the Compression setting or set the Compression setting to "delayed" or "no". |