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Check: GEN004540

SUSE Linux Enterprise Server v11 for System z STIG: GEN004540 (in versions v1 r12 through v1 r9)

Title

The SMTP service HELP command must not be enabled. (Cat II impact)

Discussion

The HELP command should be disabled to mask version information. The version of the SMTP service software could be used by attackers to target vulnerabilities present in specific software versions.

Check Content

Check if the sendmail package is installed: # rpm –q sendmail If sendmail is not installed, this check is not applicable. Check if Help is disabled. This rule is for “sendmail” only and not applicable to “Postfix”. Procedure: # telnet <host> 25 > help If the help command returns any sendmail version information, this is a finding.

Fix Text

To disable the SMTP HELP command, remove, rename or empty the /usr/lib/sendmail.d.helpfile file. # echo > /usr/lib/sendmail.d/helpfile

Additional Identifiers

Rule ID: SV-45863r2_rule

Vulnerability ID: V-12006

Group Title: GEN004540

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