Vulnerability Assessment & Network Security Forums



If through a vulnerability assessment, a network security issue is detected for the vulnerability below, applying the appropriate security patches in a timely matter is very important.  If you have detected that your system has already been compromised, following CERT's Network Security recovery document will assist with recommended steps for system recovery.


Home >> Browse Vulnerability Assessment Database >> SMTP problems >> EXPN and VRFY commands


Vulnerability Assessment Details

EXPN and VRFY commands

Vulnerability Assessment Summary
EXPN and VRFY checks

Detailed Explanation for this Vulnerability Assessment

The remote SMTP server answers to the EXPN and/or VRFY commands.

The EXPN command can be used to find the delivery address of mail aliases, or
even the full name of the recipients, and the VRFY command may be used to check the validity of an account.


Your mailer should not permit remote users to use any of these commands,
because it gives them too much information.


Solution : if you are using Sendmail, add the option :

O PrivacyOptions=goaway

in /etc/sendmail.cf.

Network Security Threat Level: Low

Networks Security ID:

Vulnerability Assessment Copyright: This script is Copyright (C) 1999 Renaud Deraison

Cables, Connectors

Dell PowerEdge R510 2x X5570 2.93GHz Quad Core 128GB 12x 300GB 15K SAS PERC H700
$2016.0
Dell PowerEdge R510 2x X5570 2.93GHz Quad Core 128GB 12x 300GB 15K SAS PERC H700 pictureDELL POWEREDGE R730XD SERVER 12 BAY TWO E5-2620V3 2.4GHZ 1024GB 4 X 500GB SATA H
$13829.0
DELL POWEREDGE R730XD SERVER 12 BAY TWO E5-2620V3 2.4GHZ 1024GB 4 X 500GB SATA H picture


Discussions

No Discussions have been posted on this vulnerability.