The SMTP service log file must have mode 0644 or less permissive.

Overview

Finding ID	Version	Rule ID	IA Controls	Severity
V-838	GEN004500	SV-37502r3_rule		Medium

Description
If the SMTP service log file is more permissive than 0644, unauthorized users may be allowed to change the log file.

STIG	Date
Red Hat Enterprise Linux 5 Security Technical Implementation Guide	2016-12-16

Details

Check Text ( C-36159r4_chk )
Check the mode of the SMTP service log file. Procedure: The check procedure is the same for both sendmail and Postfix. Identify any log files configured for the "mail" service (excluding mail.none) at any severity level and check the permissions. Depending on what system is used for log processing, either /etc/syslog.conf or /etc/rsyslog.conf will be the logging configuration file. For syslog: # egrep "mail\.[^n][^/]" /etc/syslog.conf\|sed 's/^[^/]//'\|xargs ls -lL For rsyslog: # egrep "mail\.[^n][^/]" /etc/rsyslog.conf\|sed 's/^[^/]//'\|xargs ls -lL If the log file permissions are greater than 0644, this is a finding.

Check Text ( C-36159r4_chk )

Check the mode of the SMTP service log file.

Procedure:
The check procedure is the same for both sendmail and Postfix.
Identify any log files configured for the "mail" service (excluding mail.none) at any severity level and check the permissions. Depending on what system is used for log processing, either /etc/syslog.conf or /etc/rsyslog.conf will be the logging configuration file.
For syslog:
# egrep "mail\.[^n][^/]*" /etc/syslog.conf|sed 's/^[^/]*//'|xargs ls -lL

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

If the log file permissions are greater than 0644, this is a finding.

Fix Text (F-31410r1_fix)
Change the mode of the SMTP service log file. Procedure: The fix procedure is the same for both sendmail and Postfix. # chmod 0644