STIGQter STIGQter: STIG Summary: Tri-Lab Operating System Stack (TOSS) 5 Security Technical Implementation Guide Version: 1 Release: 1 Benchmark Date: 26 Mar 2026:

TOSS 5 must be configured so that the Network File System (NFS) is configured to use RPCSEC_GSS.

DISA Rule

SV-282639r1200897_rule

Vulnerability Number

V-282639

Group Title

SRG-OS-000480-GPOS-00227

Rule Version

TOSS-05-000134

Severity

CAT II

CCI(s)

Weight

10

Fix Recommendation

Update the "/etc/fstab" file so the option "sec" is defined for each NFS mounted file system and the "sec" option does not have the "sys" setting.

Ensure the "sec" option is defined as "krb5p:krb5i:krb5".

Check Contents

Verify TOSS 5 has the "sec" option configured for all NFS mounts using the following command:

Note: If no NFS mounts are configured, this requirement is not applicable.

$ cat /etc/fstab | grep nfs

192.168.22.2:/mnt/export /data nfs4 rw,nosuid,nodev,noexec,sync,soft,sec=krb5p:krb5i:krb5

If the system is mounting file systems via NFS and has the sec option without the "krb5:krb5i:krb5p" settings, the "sec" option has the "sys" setting, or the "sec" option is missing, this is a finding.

Vulnerability Number

V-282639

Documentable

False

Rule Version

TOSS-05-000134

Severity Override Guidance

Verify TOSS 5 has the "sec" option configured for all NFS mounts using the following command:

Note: If no NFS mounts are configured, this requirement is not applicable.

$ cat /etc/fstab | grep nfs

192.168.22.2:/mnt/export /data nfs4 rw,nosuid,nodev,noexec,sync,soft,sec=krb5p:krb5i:krb5

If the system is mounting file systems via NFS and has the sec option without the "krb5:krb5i:krb5p" settings, the "sec" option has the "sys" setting, or the "sec" option is missing, this is a finding.

Check Content Reference

M

Target Key

5738