If the AIX host is running an SMTP service, the SMTP greeting must not provide version information.
An XCCDF Rule
Description
<VulnDiscussion>The version of the SMTP service can be used by attackers to plan an attack based on vulnerabilities present in the specific version.</VulnDiscussion><FalsePositives></FalsePositives><FalseNegatives></FalseNegatives><Documentable>false</Documentable><Mitigations></Mitigations><SeverityOverrideGuidance></SeverityOverrideGuidance><PotentialImpacts></PotentialImpacts><ThirdPartyTools></ThirdPartyTools><MitigationControl></MitigationControl><Responsibility></Responsibility><IAControls></IAControls>
- ID
- SV-215412r508663_rule
- Severity
- Low
- References
- Updated
Remediation - Manual Procedure
Ensure "Sendmail" or its equivalent has been configured to mask the version information. If necessary, change the "O SmtpGreetingMessage" line in the "/etc/sendmail.cf" file from:
O SmtpGreetingMessage=$j Sendmail $v/$Z; $b
to:
O SmtpGreetingMessage= Mail Server Ready ; $b