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The SSH daemon must limit connections to a single session.
Overview
| Finding ID | Version | Rule ID | IA Controls | Severity |
|---|---|---|---|---|
| V-63225 | ESXI-06-000028 | SV-77715r1_rule | Medium |
| 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 vSphere ESXi 6.0 Security Technical Implementation Guide | 2017-07-11 |
Details
| Check Text ( C-63959r1_chk ) |
|---|
| To verify the MaxSessions setting, run the following command: # grep -i "^MaxSessions" /etc/ssh/sshd_config If there is no output or the output is not exactly "MaxSessions 1", this is a finding. |
| Fix Text (F-69143r1_fix) |
|---|
| To set the MaxSessions setting, add or correct the following line in "/etc/ssh/sshd_config": MaxSessions 1 |