Check: GEN005900 M6
MACOSX 10.6:
GEN005900 M6
(in version v1 r3)
Title
The nosuid option must be enabled on all NFS client mounts. (Cat II impact)
Discussion
Enabling the nosuid mount option prevents the system from granting owner or group-owner privileges to programs with the suid or sgid bit set. If the system does not restrict this access, users with unprivileged access to the local system may be able to acquire privileged access by executing suid or sgid files located on the mounted NFS file system.
Check Content
Open a terminal session and enter the following command to check the system for NFS mounts not using the "nosuid" option. mount -t nfs | egrep -v "nosuid" If anything is returned, the mounted file systems do not have the "nosuid" option and this is a finding.
Fix Text
Open a terminal session and edit /etc/auto_master and add the "nosuid" option at the end of the line that begins with /net. In the same terminal session, edit /etc/fstab and add the "nosuid" option to any lines for NFS mounts. Remount the NFS file systems to make the change take effect.
Additional Identifiers
Rule ID: SV-38158r2_rule
Vulnerability ID: V-936
Group Title:
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 |