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The SMTP service must not have the EXPN feature active.


Overview

Finding ID Version Rule ID IA Controls Severity
GEN004660-ESXI5-PNF GEN004660-ESXI5-PNF GEN004660-ESXI5-PNF_rule Low
Description
The SMTP EXPN function allows an attacker to determine if an account exists on a system, providing significant assistance to a brute-force attack on user accounts. EXPN may also provide additional information concerning users on the system, such as the full names of account owners. Applicable, but permanent not-a-finding - The hypervisor does not support this function.
STIG Date
VMware ESXi v5 Security Technical Implementation Guide 2013-01-15

Details

Check Text ( C-GEN004660-ESXI5-PNF_chk )
ESXi supports this requirement and cannot be configured to be out of compliance. This is a permanent not a finding.
Fix Text (F-GEN004660-ESXI5-PNF_fix)
This requirement is permanent not a finding. No fix is required.