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IBM z/OS UNIX MVS HFS directory(s) with other write permission bit set must be properly defined.


Overview

Finding ID Version Rule ID IA Controls Severity
V-223620 ACF2-US-000050 SV-223620r533198_rule Medium
Description
Access control policies include: identity-based policies, role-based policies, and attribute-based policies. Access enforcement mechanisms include: access control lists, access control matrices, and cryptography. These policies and mechanisms must be employed by the application to control access between users (or processes acting on behalf of users) and objects (e.g., devices, files, records, processes, programs, and domains) in the information system.
STIG Date
IBM z/OS ACF2 Security Technical Implementation Guide 2022-06-22

Details

Check Text ( C-25293r504818_chk )
On the OMVS Command line enter the following command string:
find / -type d -perm -0002 ! -perm -1000 -exec ls -aldWE {} \;

If there are no directories that have the other write permission bit set on without the sticky bit set on, this is not a finding.

NOTE: In the symbolic permission bit display, the sticky bit is indicated as a “t” or “T” in the execute portion of the other permissions. For example, a display of the permissions of a directory with the sticky bit on could be “drwxrwxrwt”.

If all directories that have the other write permission bit set on do not contain any files with the setuid bit set on, this is not a finding.

NOTE: In the symbolic permission bit display, the setuid bit is indicated as an “s” or “S” in the execute portion of the owner permissions. For example, a display of the permissions of a file with the setuid bit on could be “-rwsrwxrwx”.

If all directories that have the other write permission bit set on do not contain any files with the setgid bit set on, this is not a finding.

NOTE: In the symbolic permission bit display, the setgid bit is indicated as an “s” or “S” in the execute portion of the group permissions. For example, a display of the permissions of a file with the setgid bit on could be “-rwxrwsrwx”.
Fix Text (F-25281r504819_fix)
Configure directory permissions as follows:
There are no directories that have the other Write permission bit set on without the sticky bit set on.

NOTE: In the symbolic permission bit display, the sticky bit is indicated as a "t" or "T" in the execute portion of the other permissions. For example, a display of the permissions of a directory with the sticky bit on could be “drwxrwxrwt”.

All directories that have the other write permission bit set on do not contain any files with the setuid bit set on.

NOTE: In the symbolic permission bit display, the setuid bit is indicated as an "s" or "S" in the execute portion of the owner permissions. For example, a display of the permissions of a file with the setuid bit on could be "-rwsrwxrwx".

All directories that have the other write permission bit set on do not contain any files with the setgid bit set on.

NOTE: In the symbolic permission bit display, the setgid bit is indicated as an "s" or "S" in the execute portion of the group permissions. For example, a display of the permissions of a file with the setgid bit on could be "-rwxrwsrwx".