The SMTP service must not have the EXPN feature active.

Overview

Finding ID	Version	Rule ID	IA Controls	Severity
V-4692	GEN004660	SV-4692r2_rule	ECSC-1	Low

Description
The SMTP EXPN function allows an attacker to determine if an account exists on a system, providing significant assistance to a brute-force attack on user accounts. EXPN may also provide additional information concerning users on the system, such as the full names of account owners.

STIG	Date
Solaris 10 SPARC Security Technical Implementation Guide	2020-02-26

Details

Check Text ( C-28638r1_chk )
Determine if EXPN is disabled. Procedure: # telnet localhost 25 expn root If the command does not return a 500 error code of command unrecognized, this is a finding. OR Locate the sendmail.cf configuration file. Procedure: # find / -name sendmail.cf -print # grep -v "^#" \| egrep -i "(goaway\|noexpn)" Verify the EXPN command is disabled with an entry in the sendmail.cf file that reads as one of the following: Opnoexpn O PrivacyOptions=noexpn Opgoaway O PrivacyOptions=goaway (Other privacy options, such as novrfy or noetrn, may be included in the same line, separated by commas. The goaway option encompasses a number of privacy options, including noexpn.) If the EXPN command is not disabled, this is a finding.

Check Text ( C-28638r1_chk )

Determine if EXPN is disabled.

Procedure:
# telnet localhost 25
expn root

If the command does not return a 500 error code of command unrecognized, this is a finding.

OR

Locate the sendmail.cf configuration file.

Procedure:
# find / -name sendmail.cf -print
# grep -v "^#" | egrep -i "(goaway|noexpn)"

Verify the EXPN command is disabled with an entry in the sendmail.cf file that reads as one of the following:

Opnoexpn
O PrivacyOptions=noexpn
Opgoaway
O PrivacyOptions=goaway

(Other privacy options, such as novrfy or noetrn, may be included in the same line, separated by commas. The goaway option encompasses a number of privacy options, including noexpn.) If the EXPN command is not disabled, this is a finding.

Fix Text (F-4620r2_fix)
Edit the sendmail.cf file and add Opnoexpn option. Restart the Sendmail service.