The operating system must monitor and control communications at the external boundary of the information system and at key internal boundaries within the system.

From VMware ESXi Server 5.0 Security Technical Implementation Guide

Associated with: CCI-001097

SV-51255r1_rule The operating system must monitor and control communications at the external boundary of the information system and at key internal boundaries within the system.

Vulnerability discussion

Unrestricted access to services running on an ESXi host can exposes a host to outside attacks and unauthorized access. Reduce the risk by configuring the ESXi firewall to allow access from authorized networks only.

Check content

From the vSphere client, select the host, then select "Configuration >> Security Profile". In the "Firewall" section select "Properties". For each enabled service, (e.g., ssh, vSphere Web Access, http client), select "Firewall", and verify "Only allow connections from the following networks" is selected and a range of authorized IP addresses is listed. If any enabled service's firewall entry is not configured for "Only allow connections from the following networks" with a range of authorized IP addresses listed, this is a finding.

Fix text

For each host, from the vSphere client, select the host and go to "Configuration >> Security Profile". In the "Firewall" section select "Properties". For each enabled service, (e.g., ssh, vSphere Web Access, http client), select "Firewall", select "Only allow connections from the following networks", and provide a range of authorized IP addresses.

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