STIGQter: STIG Summary: IBM z/OS ACF2 Security Technical Implementation Guide Version: 8 Release: 2 Benchmark Date: 23 Apr 2021:

IBM z/OS User exits for the FTP Server must not be used without proper approval and documentation.

DISA Rule

SV-223632r533198_rule

Vulnerability Number

V-223632

Group Title

SRG-OS-000096-GPOS-00050

Rule Version

ACF2-US-000170

Severity

CAT II

CCI(s)

• CCI-000382 - The organization configures the information system to prohibit or restrict the use of organization-defined functions, ports, protocols, and/or services.

Weight

10

Fix Recommendation

Review the configuration statements in the FTP.DATA file. Review the FTP daemon STEPLIB, system Linklist, and Link Pack Area libraries. If FTP Server exits are enabled or present, and have not been approved by the site ISSM and not securely written and implemented by the site systems programmer, they should not be installed. Verify that none of the following exits are installed unless they have met the requirements listed above:
FTCHKCMD
FTCHKIP
FTCHKJES
FTCHKPWD
FTPOSTPR
FTPSMFEX

Check Contents

Refer to the Data configuration file specified on the SYSFTPD DD statement in the FTP started task JCL.

Refer to the file(s) allocated by the STEPLIB DD statement in the FTP started task JCL.

Refer to the libraries specified in the system Linklist and LPA.

If any FTP Server exits are in use, identify them and validate that they were reviewed for integrity and approved by the site AO.

If the following items are in effect for FTP Server user exits, this is not a finding:

The FTCHKCMD, FTCHKIP, FTCHKJES, FTCHKPWD, FTPSMFEX and FTPOSTPR modules are not located in the FTP daemon’s STEPLIB, Linklist, or LPA.

NOTE: The ISPF ISRFIND utility can be used to search the system Linklist and LPA for specific modules.

Vulnerability Number

V-223632

Documentable

False

Rule Version

ACF2-US-000170

Severity Override Guidance

Refer to the Data configuration file specified on the SYSFTPD DD statement in the FTP started task JCL.

Refer to the file(s) allocated by the STEPLIB DD statement in the FTP started task JCL.

Refer to the libraries specified in the system Linklist and LPA.

If any FTP Server exits are in use, identify them and validate that they were reviewed for integrity and approved by the site AO.

If the following items are in effect for FTP Server user exits, this is not a finding:

The FTCHKCMD, FTCHKIP, FTCHKJES, FTCHKPWD, FTPSMFEX and FTPOSTPR modules are not located in the FTP daemon’s STEPLIB, Linklist, or LPA.

NOTE: The ISPF ISRFIND utility can be used to search the system Linklist and LPA for specific modules.

Check Content Reference

M

Target Key

4100

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