Startup parameters for the z/OS UNIX Telnet Server are not specified properly.

Overview

Finding ID	Version	Rule ID	IA Controls	Severity
V-3230	IUTN0020	SV-3230r2_rule	DCCS-1 DCCS-2	Medium

Description
The z/OS UNIX Telnet Server (i.e., otelnetd) provides interactive access to the z/OS UNIX shell. During the initialization process, startup parameters are read to define the characteristics of each otelnetd instance. Some of these parameters have an impact on system security. Failure to specify the appropriate command options could result in degraded security. This exposure may result in unauthorized access impacting data integrity or the availability of some system services.

Description

The z/OS UNIX Telnet Server (i.e., otelnetd) provides interactive access to the z/OS UNIX shell. During the initialization process, startup parameters are read to define the characteristics of each otelnetd instance. Some of these parameters have an impact on system security. Failure to specify the appropriate command options could result in degraded security. This exposure may result in unauthorized access impacting data integrity or the availability of some system services.

STIG	Date
z/OS TSS STIG	2019-09-27

Details

Check Text ( C-3232r1_chk )
a) Refer to the following report produced by the UNIX System Services Data Collection: - USSCMDS.RPT(EINETD) b) Ensure the following items are in effect for the otelnetd startup command: 1) Option -D login is included on the otelnetd command. 2) Option -c 900 is included on the otelnetd command. NOTE: 900 indicates a session timeout value of 15 minutes and is currently the maximum value allowed. 3) Option -h is not included on the otelnetd command. c) If all of the items in (b) are true, there is NO FINDING. d) If any item in (b) is untrue, this is a FINDING.

Check Text ( C-3232r1_chk )

a) Refer to the following report produced by the UNIX System Services Data Collection:

- USSCMDS.RPT(EINETD)

b) Ensure the following items are in effect for the otelnetd startup command:

1) Option -D login is included on the otelnetd command.

2) Option -c 900 is included on the otelnetd command.

NOTE: 900 indicates a session timeout value of 15 minutes and is currently the maximum value allowed.

3) Option -h is not included on the otelnetd command.

c) If all of the items in (b) are true, there is NO FINDING.

d) If any item in (b) is untrue, this is a FINDING.

Fix Text (F-18205r1_fix)
Review the startup parameters in the inetd.conf file for otelnetd and ensure they conform to the specifications below. The otelnetd startup command includes the options -D login and -c 900, where: -D login indicates that messages should be written to the syslogd facility for login and logout activity -c 900 indicates that the Telnet session should be terminated after 15 minutes of inactivity. NOTE: The 900 is the maximum value; any value between 1 and 900 is acceptable. The otelnetd startup command should not include the option -h, where: -h indicates that the logon banner should not be displayed.

Fix Text (F-18205r1_fix)

Review the startup parameters in the inetd.conf file for otelnetd and ensure they conform to the specifications below.

The otelnetd startup command includes the options -D login and -c 900, where:

-D login indicates that messages should be written to the syslogd facility for login and logout activity

-c 900 indicates that the Telnet session should be terminated after 15 minutes of inactivity.

NOTE: The 900 is the maximum value; any value between 1 and 900 is acceptable.

The otelnetd startup command should not include the option -h, where:

-h indicates that the logon banner should not be displayed.