The SMTP service log file must not have an extended ACL.

Overview

Finding ID	Version	Rule ID	IA Controls	Severity
V-22442	GEN004510	SV-37503r3_rule		Medium

Description
If the SMTP service log file has an extended ACL, unauthorized users may be allowed to access or to modify the log file.

STIG	Date
Red Hat Enterprise Linux 5 Security Technical Implementation Guide	2017-03-01

Details

Check Text ( C-36160r4_chk )
Depending on what system is used for log processing, either /etc/syslog.conf or /etc/rsyslog.conf will be the logging configuration file. Examine /etc/syslog.conf or /etc/rsyslog.conf and determine the log file(s) receiving logs for "mail.crit", "mail.debug", mail., or ".crit". Procedure: This check is applicable to both Postfix and sendmail servers. Check the permissions on these log files.Identify any log files configured for ".crit" and the "mail" service (excluding mail.none) and at any severity level. For syslog: # egrep "(\.crit\|mail\.[^n][^/])" /etc/syslog.conf\|sed 's/^[^/]//'\|xargs ls -lL For rsyslog: # egrep "(\.crit\|mail\.[^n][^/])" /etc/rsyslog.conf\|sed 's/^[^/]*//'\|xargs ls -lL If the permissions include a '+', the file has an extended ACL. If the file has an extended ACL and it has not been documented with the ISSO, this is a finding.

Check Text ( C-36160r4_chk )

Depending on what system is used for log processing, either /etc/syslog.conf or /etc/rsyslog.conf will be the logging configuration file. Examine /etc/syslog.conf or /etc/rsyslog.conf and determine the log file(s) receiving logs for "mail.crit", "mail.debug", mail.*, or "*.crit".

Procedure:
This check is applicable to both Postfix and sendmail servers.
Check the permissions on these log files.Identify any log files configured for "*.crit" and the "mail" service (excluding mail.none) and at any severity level.
For syslog:
# egrep "(\*.crit|mail\.[^n][^/]*)" /etc/syslog.conf|sed 's/^[^/]*//'|xargs ls -lL

For rsyslog:
# egrep "(\*.crit|mail\.[^n][^/]*)" /etc/rsyslog.conf|sed 's/^[^/]*//'|xargs ls -lL

If the permissions include a '+', the file has an extended ACL. If the file has an extended ACL and it has not been documented with the ISSO, this is a finding.

Fix Text (F-31411r1_fix)
This fix is applicable to both Postfix and sendmail servers. Remove the extended ACL from the file. # setfacl --remove-all