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Check: GEN004560

VMware ESX 3 Server: GEN004560 (in version v1 r2)

Title

The SMTP service's SMTP greeting must not provide version information. (Cat III impact)

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

Check for the Sendmail version being displayed in the greeting. # telnet localhost 25 If a version number is displayed, this is a finding.

Fix Text

Ensure Sendmail or its equivalent has been configured to mask the version information. If necessary, change the O SmtpGreetingMessage line in the /etc/mail/sendmail.cf file as noted below. O SmtpGreetingMessage=$j Sendmail $v/$Z; $b Change it to: O SmtpGreetingMessage= Mail Server Ready ; $b

Additional Identifiers

Rule ID: SV-4384r2_rule

Vulnerability ID: V-4384

Group Title: GEN004560

Expert Comments

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CCIs

CCIs tied to check.

Number	Definition
CCI-000366	The organization implements the security configuration settings.

Controls

Controls tied to check. These are derived from the CCIs shown above.

Number	Title
CM-6	Configuration Settings