← Back to VMware vRealize Operations Manager 6.x SLES Security Technical Implementation Guide

V-239538

CAT II (Medium)

The SMTP services SMTP greeting must not provide version information.

Rule ID

SV-239538r662065_rule

STIG

VMware vRealize Operations Manager 6.x SLES Security Technical Implementation Guide

Version

V2R2

CCIs

CCI-000382

Discussion

The version of the SMTP service can be used by attackers to plan an attack based on vulnerabilities present in the specific version.

Check Content

To check for the sendmail version being displayed in the greeting:

# more /etc/sendmail.cf | grep SmtpGreetingMessage

If it returns: 

O SmtpGreetingMessage=$j Sendmail $v/$Z; $b

Then sendmail is providing version information, this is a finding.

Fix Text

Change the "O SmtpGreetingMessage" line in the "/etc/sendmail.cf" file to:

O SmtpGreetingMessage= Mail Server Ready ; $b