All files and directories contained in user's home directories must be group-owned by a group the home directory's owner is a member.

Overview

Finding ID	Version	Rule ID	IA Controls	Severity
V-22351	GEN001550	SV-26453r1_rule	ECLP-1	Medium

Description
If a user's files are group-owned by a group where the user is not a member, unintended users may be able to access them.

STIG	Date
UNIX SRG	2013-03-26

Details

Check Text ( C-40624r1_chk )
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 < users home directory > -exec ls -lLd 3. Obtain the list of GIDs associated with the user's account. # id < user name > 4. Check the GID lists. If there are GIDs in the file list not present in the user list, this is a finding.

Check Text ( C-40624r1_chk )

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 < users home directory > -exec ls -lLd
3. Obtain the list of GIDs associated with the user's account.
# id < user name >
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 (F-23645r1_fix)
Change the group of a file not group-owned by a group where the home directory's owner is a member. # chgrp [user's primary group] [file with bad group ownership]