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

File Name: 2023.prm

Family: SMTP Servers

Published: 2004/08/18

Modified: 2016/01/30

Dependencies: 2004, 2005

Nessus ID: 10249

Risk Information

Risk Factor: Medium

CVSSv2

Base Score: 5

Temporal Score: 4.4

Vector: CVSS2#AV:N/AC:L/Au:N/C:P/I:N/A:N

Temporal Vector: CVSS2#E:ND/RL:OF/RC:C

CVSSv3

Base Score: 5.8

Temporal Score: 5.6

Vector: CVSS3#AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:N/A:N

Temporal Vector: CVSS3#E:X/RL:O/RC:C