Details

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.

Solution

To set the MaxSessions setting, add or correct the following line in ‘/etc/ssh/sshd_config’:

MaxSessions 1

Supportive Information

The following resource is also helpful.

• http://iasecontent.disa.mil/stigs/zip/U_VMware_vSphere_6-0_ESXi_V1R5_STIG.zip

This security hardening control applies to the following category of controls within NIST 800-53: Configuration Management.This control applies to the following type of system Unix.

References

• 800-53|CM-6b.
• CAT|II
• CCI|CCI-000366
• Group-ID|V-63225
• Rule-ID|SV-77715r1_rule
• STIG-ID|ESXI-06-000028
• Vuln-ID|V-63225

Source

• Tenable.com/audits