The NFS server must not have the all

The NFS server must not have the all_squash option enabled.

Overview

Finding ID	Version	Rule ID	IA Controls	Severity
V-50595	OL6-00-000515	SV-64801r1_rule		Low

Description
The "all_squash" option maps all client requests to a single anonymous uid/gid on the NFS server, negating the ability to track file access by user ID.

STIG	Date
Oracle Linux 6 Security Technical Implementation Guide	2018-03-01

Details

Check Text ( C-53109r1_chk )
If the NFS server is read-only, in support of unrestricted access to organizational content, this is not applicable. The related "root_squash" option provides protection against remote administrator-level access to NFS server content. Its use is not a finding. To verify the "all_squash" option has been disabled, run the following command: # grep all_squash /etc/exports If there is output, this is a finding.

Check Text ( C-53109r1_chk )

If the NFS server is read-only, in support of unrestricted access to organizational content, this is not applicable.

The related "root_squash" option provides protection against remote administrator-level access to NFS server content. Its use is not a finding.

To verify the "all_squash" option has been disabled, run the following command:

# grep all_squash /etc/exports

If there is output, this is a finding.

Fix Text (F-55391r1_fix)
Remove any instances of the "all_squash" option from the file "/etc/exports". Restart the NFS daemon for the changes to take effect. # service nfs restart