The SSH daemon must limit connections to a single session.
Overview
| Finding ID | Version | Rule ID | IA Controls | Severity |
|---|---|---|---|---|
| GEN005533-ESXI5-000109 | GEN005533-ESXI5-000109 | GEN005533-ESXI5-000109_rule | Low |
| Description |
|---|
| The SSH protocol has the ability to provide multiple sessions over a single connection without reauthentication. A compromised client could use this feature to establish additional sessions to a system without consent or knowledge of the user. |
| STIG | Date |
|---|---|
| VMware ESXi v5 Security Technical Implementation Guide | 2013-01-15 |
Details
| Check Text ( C-GEN005533-ESXI5-000109_chk ) |
|---|
| Disable lock down mode. Enable the ESXi Shell. Login as root and execute the following command(s): # grep MaxSessions /etc/ssh/sshd_config If "MaxSessions" is not set to "1" or the keyword/line is missing, this is a finding. Re-enable lock down mode. |
| Fix Text (F-GEN005533-ESXI5-000109_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 "MaxSessions" keyword to "1", i.e.; MaxSessions= 1 Re-enable lock down mode. |