HFS objects for the z/OS UNIX Telnet Server will be properly protected.

Overview

Finding ID	Version	Rule ID	IA Controls	Severity
V-3232	IUTN0040	SV-3232r3_rule	DCCS-1 DCCS-2 ECCD-1 ECCD-2	Medium

Description
HFS directories and files of the z/OS UNIX Telnet Server provide the configuration and executable properties of this product. Failure to properly secure these objects may lead to unauthorized access resulting in the compromise of the integrity and availability of the operating system environment, ACP, and customer data.

STIG	Date
z/OS RACF STIG	2019-12-12

Details

Check Text ( C-3234r3_chk )
Refer to the following report produced by the UNIX System Services Data Collection: - USSCMDS.RPT(IUTN0040) Refer to the following report produced by the IBM Communications Server Data Collection: - PDI(ZUTN0040) The HFS permission bits and user audit bits for each directory and file match or are more restrictive than the specified settings listed in the table. If the guidance is true, this is not a finding. z/OS UNIX TELNET Server HFS Object Security Settings File Permission Bits User Audit Bits /usr/sbin/otelnetd 1740 fff /etc/banner 0744 faf NOTE: The /usr/sbin/otelnetd object is a symbolic link to /usr/lpp/tcpip/sbin/otelnetd. The permission and user audit bits on the target of the symbolic link must have the required settings. The following represents a hierarchy for permission bits from least restrictive to most restrictive: 7 rwx (least restrictive) 6 rw- 3 -wx 2 -w- 5 r-x 4 r-- 1 --x 0 --- (most restrictive) The possible audit bits settings are as follows: f log for failed access attempts a log for failed and successful access - no auditing

Check Text ( C-3234r3_chk )

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

- USSCMDS.RPT(IUTN0040)

Refer to the following report produced by the IBM Communications Server Data Collection:

- PDI(ZUTN0040)

The HFS permission bits and user audit bits for each directory and file match or are more restrictive than the specified settings listed in the table. If the guidance is true, this is not a finding.

z/OS UNIX TELNET Server HFS Object Security Settings
File Permission Bits User Audit Bits
/usr/sbin/otelnetd 1740 fff
/etc/banner 0744 faf

NOTE:
The /usr/sbin/otelnetd object is a symbolic link to /usr/lpp/tcpip/sbin/otelnetd. The permission and user audit bits on the target of the symbolic link must have the required settings.

The following represents a hierarchy for permission bits from least restrictive to most restrictive:

7 rwx (least restrictive)
6 rw-
3 -wx
2 -w-
5 r-x
4 r--
1 --x
0 --- (most restrictive)

The possible audit bits settings are as follows:

f log for failed access attempts
a log for failed and successful access
- no auditing

Fix Text (F-36634r2_fix)
The IAO with the assistance of a systems programmer with UID(0) and/or SUPERUSER access, will review the UNIX permission bits and user audit bits on the HFS directories and files for the z/OS UNIX Telnet Server. Ensure they conform to the specifications below: z/OS UNIX TELNET Server HFS Object Security Settings File Permission Bits User Audit Bits /usr/sbin/otelnetd 1740 fff /etc/banner 0744 faf NOTE: The /usr/sbin/otelnetd object is a symbolic link to /usr/lpp/tcpip/sbin/otelnetd. The permission and user audit bits on the target of the symbolic link must have the required settings. The following represents a hierarchy for permission bits from least restrictive to most restrictive: 7 rwx (least restrictive) 6 rw- 3 -wx 2 -w- 5 r-x 4 r-- 1 --x 0 --- (most restrictive) The possible audit bits settings are as follows: f log for failed access attempts a log for failed and successful access - no auditing The following commands can be used (from a user account with an effective UID(0)) to update the permission bits and audit bits: chmod 1740 /usr/lpp/tcpip/sbin/otelnetd chaudit rwx=f /usr/lpp/tcpip/sbin/otelnetd chmod 0744 /etc/banner chaudit w=sf,rx+f /etc/banner

Fix Text (F-36634r2_fix)

The IAO with the assistance of a systems programmer with UID(0) and/or SUPERUSER access, will review the UNIX permission bits and user audit bits on the HFS directories and files for the z/OS UNIX Telnet Server. Ensure they conform to the specifications below:

z/OS UNIX TELNET Server HFS Object Security Settings
File Permission Bits User Audit Bits
/usr/sbin/otelnetd 1740 fff
/etc/banner 0744 faf

NOTE:
The /usr/sbin/otelnetd object is a symbolic link to /usr/lpp/tcpip/sbin/otelnetd. The permission and user audit bits on the target of the symbolic link must have the required settings.

The following represents a hierarchy for permission bits from least restrictive to most restrictive:

7 rwx (least restrictive)
6 rw-
3 -wx
2 -w-
5 r-x
4 r--
1 --x
0 --- (most restrictive)

The possible audit bits settings are as follows:

f log for failed access attempts
a log for failed and successful access
- no auditing

The following commands can be used (from a user account with an effective UID(0)) to update the permission bits and audit bits:

chmod 1740 /usr/lpp/tcpip/sbin/otelnetd
chaudit rwx=f /usr/lpp/tcpip/sbin/otelnetd
chmod 0744 /etc/banner
chaudit w=sf,rx+f /etc/banner