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Check: GEN004540

Solaris 10 X86 STIG: GEN004540 (in versions v2 r4 through v1 r17)

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 Help is disabled in Sendmail. Procedure: # telnet <host> 25 > help If the help command returns any Sendmail version information, this is a finding. If telnet is unavailable for testing, check the value of the HelpFile parameter in the sendmail.cf file. # grep HelpFile /etc/mail/sendmail.cf If the contents of the file indicated by the HelpFile parameter contains any Sendmail version information, this is a finding.

Fix Text

To disable the SMTP HELP command, clear the Sendmail help file. # echo > /etc/mail/helpfile

Additional Identifiers

Rule ID: SV-220099r603266_rule

Vulnerability ID: V-220099

Group Title: SRG-OS-000480

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