SMTP Service Cleartext Login Permitted

low Nessus Plugin ID 54582
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Synopsis

The remote mail server allows cleartext logins.

Description

The remote host is running an SMTP server that advertises that it allows cleartext logins over unencrypted connections. An attacker may be able to uncover user names and passwords by sniffing traffic to the server if a less secure authentication mechanism (i.e. LOGIN or PLAIN) is used.

Solution

Configure the service to support less secure authentication mechanisms only over an encrypted channel.

See Also

https://tools.ietf.org/html/rfc4422

https://tools.ietf.org/html/rfc4954

Plugin Details

Severity: Low

ID: 54582

File Name: smtp_unencrypted_cleartext_logins.nasl

Version: 1.7

Type: remote

Published: 5/19/2011

Updated: 1/19/2021

Dependencies: smtp_authentication.nasl, ssl_supported_versions.nasl

Risk Information

CVSS Score Source: manual

CVSS Score Rationale: Score from an in depth analysis done by tenable.

CVSS v2

Risk Factor: Low

Base Score: 2.6

Vector: AV:N/AC:H/Au:N/C:P/I:N/A:N

Vulnerability Information