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Test ID:1.3.6.1.4.1.25623.1.0.100072
Category:SMTP problems
Title:Check if Mailserver answer to VRFY and EXPN requests
Summary:The Mailserver on this host answers to VRFY and/or EXPN requests.
Description:Summary:
The Mailserver on this host answers to VRFY and/or EXPN requests.

Vulnerability Insight:
VRFY and EXPN ask the server for information about an address. They are
inherently unusable through firewalls, gateways, mail exchangers for part-time hosts, etc.

Solution:
Disable VRFY and/or EXPN on your Mailserver.

For postfix add 'disable_vrfy_command=yes' in 'main.cf'.

For Sendmail add the option 'O PrivacyOptions=goaway'.

It is suggested that, if you really want to publish this type of information, you use a mechanism
that legitimate users actually know about, such as Finger or HTTP.

CVSS Score:
5.0

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

CopyrightCopyright (C) 2009 Greenbone Networks GmbH

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