Check: GEN001550
SUSE Linux Enterprise Server v11 for System z STIG:
GEN001550
(in versions v1 r12 through v1 r9)
Title
All files and directories contained in user home directories must be group-owned by a group of which the home directorys owner is a member. (Cat II impact)
Discussion
If a user's files are group-owned by a group of which the user is not a member, unintended users may be able to access them.
Check Content
Check the contents of user home directories for files group-owned by a group of which the home directory's owner is not a member. 1. List the user accounts. # cut -d : -f 1 /etc/passwd 2. For each user account, get a list of GIDs for files in the user's home directory. # find ~username -printf %G\\n | sort | uniq 3. Obtain the list of GIDs where the user is a member. # id -G username 4. Check the GID lists. If there are GIDs in the file list not present in the user list, this is a finding.
Fix Text
Change the group of a file not group-owned by a group of which the home directory's owner is a member. # chgrp <group with user as member> <file with bad group ownership> Document all changes.
Additional Identifiers
Rule ID: SV-45038r1_rule
Vulnerability ID: V-22351
Group Title: GEN001550
Expert Comments
CCIs
| Number | Definition |
|---|---|
| CCI-000225 |
The organization employs the concept of least privilege, allowing only authorized accesses for users (and processes acting on behalf of users) which are necessary to accomplish assigned tasks in accordance with organizational missions and business functions. |
Controls
| Number | Title |
|---|---|
| AC-6 |
Least Privilege |