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IBM z/OS VTAM USSTAB definitions must not be used for unsecured terminals.

Overview

Finding IDVersionRule IDIA ControlsSeverity
V-223870RACF-VT-000020SV-223870r991560_ruleCCI-001499medium
Description
If the operating system were to allow any user to make changes to software libraries, then those changes might be implemented without undergoing the appropriate testing and approvals that are part of a robust change management process.
STIGDate
IBM z/OS RACF Security Technical Implementation Guide2026-06-03

Related Frameworks

1 mapping across 3 frameworks
SCF0 mappings

No source states a mapping between these directly.

Also reachable in 3 hops (1) derived by us, not asserted by any source

Each of these is a route we composed by chaining published mappings. No publisher states a relationship between the two endpoints.

CHG-04.5Library Privileges
1.00
NIST 800-530 mappings

No source states a mapping between these directly.

Also reachable in 2 hops (56) derived by us, not asserted by any source

Each of these is a route we composed by chaining published mappings. No publisher states a relationship between the two endpoints.

AC-17(1)Monitoring and Control
1.00
AC-2(1)Automated System Account Management
1.00
AC-2(10)Shared and Group Account Credential Change
1.00
AC-2(2)Automated Temporary and Emergency Account Management
1.00
AC-2(3)Disable Accounts
1.00
AC-2(4)Automated Audit Actions
1.00
AC-3Access Enforcement
1.00
AC-3(7)Role-based Access Control
1.00
AC-4Information Flow Enforcement
1.00
AC-6(10)Prohibit Non-privileged Users from Executing Privileged Functions
1.00

+46 more (top 10 by confidence shown)

CCI1 mapping
CCI-001499
1.00

Details

Check Text (C-223870r991560_chk)

Ask the system administrator to supply the following information: - Documentation regarding terminal naming standards. - Documentation of all procedures controlling terminal logons to the system. - A complete list of all USS commands used by terminal users to log on to the system. - Members and data set names containing USSTAB and LOGAPPL definitions of all terminals that can log on to the system (e.g., SYS1.VTAMLST). - Members and data set names containing logon mode parameters. If USSTAB definitions are only used for secure terminals (e.g., terminals that are locally attached to the host or connected to the host via secure leased lines), this is not a finding. If USSTAB definitions are used for any unsecured terminals (e.g., dial up terminals or terminals attached to the Internet such as TN3270 or KNET 3270 emulation), this is a finding.

Fix Text (F-25531r515299_fix)

Configure USSTAB definitions to be only used for secure terminals. Only terminals that are locally attached to the host or connected to the host via secure leased lines located in a secured area. Only authorized personnel may enter the area where secure terminals are located. USSTAB or LOGAPPL definitions are used to control logon from secure terminals. These terminals can log on directly to any VTAM application (e.g., TSO, CICS, etc.) of their choice and bypass Session Manager services. Secure terminals are usually locally attached to the host or connected to the host via a private LAN without access to an external network. Only authorized personnel may enter the area where secure terminals are located.