The Linux NFS Server must not have the insecure file locking option.

From Oracle Linux 5 Security Technical Implementation Guide

SV-62985r1_rule The Linux NFS Server must not have the insecure file locking option.

Vulnerability discussion

Insecure file locking could allow for sensitive data to be viewed or edited by an unauthorized user.

Check content

Determine if an NFS server is running on the system by: # ps -ef |grep nfsd If an NFS server is running, confirm it is not configured with the insecure_locks option by: # exportfs -v The example below would be a finding: /misc/export speedy.example.com(rw,insecure_locks)

Fix text

Remove the "insecure_locks" option from all NFS exports on the system. Procedure: Edit /etc/exports and remove all instances of the insecure_locks option. Re-export the file systems to make the setting take effect. # exportfs -a

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