EXPN Command Information Disclosure

medium Nessus Network Monitor Plugin ID 2023

Synopsis

The remote host may give an attacker information useful for future attacks.

Description

The remote host has the EXPN command enabled. An attacker may use it to enumerate valid accounts on this host and gain more information about them.

Solution

Disable this option in your MUA configuration file.

Plugin Details

Severity: Medium

ID: 2023

Family: SMTP Servers

Published: 8/18/2004

Updated: 3/6/2019

Nessus ID: 10249