Changes are coming to https://stigviewer.com.
Take our survey to help us understand your usage and how we can better serve you in the future.
Take Survey
The SSH daemon must not allow compression or must only allow compression after successful authentication.
Overview
| Finding ID | Version | Rule ID | IA Controls | Severity |
|---|---|---|---|---|
| GEN005539-ESXI5-000113 | GEN005539-ESXI5-000113 | GEN005539-ESXI5-000113_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 |
|---|---|
| VMware ESXi v5 Security Technical Implementation Guide | 2013-01-15 |
Details
| Check Text ( C-GEN005539-ESXI5-000113_chk ) |
|---|
| Disable lock down mode. Enable the ESXi Shell. Login as root and execute the following command(s): # grep Compression /etc/ssh/sshd_config If the "Compression" is set to "yes" or "delayed", or the keyword/line is missing, this is a finding. Re-enable lock down mode. |
| Fix Text (F-GEN005539-ESXI5-000113_fix) |
|---|
| Disable lock down mode. Enable the ESXi Shell. Login as root and execute the following command(s): # vi /etc/ssh/sshd_config Add/modify the "Compression" keyword to "no", i.e.; Compression=no Re-enable lock down mode. |