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XCCDF
Guide to the Secure Configuration of SUSE Linux Enterprise Micro 5
System Settings
File Permissions and Masks
Restrict Partition Mount Options
Restrict Partition Mount Options
An XCCDF Group - A logical subset of the XCCDF Benchmark
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Restrict Partition Mount Options
2 Rules
System partitions can be mounted with certain options that limit what files on those partitions can do. These options are set in the
/etc/fstab
configuration file, and can be used to make certain types of malicious behavior more difficult.
Removable Partition
This value is used by the checks mount_option_nodev_removable_partitions, mount_option_nodev_removable_partitions, and mount_option_nodev_removable_partitions to ensure that the correct mount options are set on partitions mounted from removable media such as CD-ROMs, USB keys, and floppy drives. This value should be modified to reflect any removable partitions that are required on the local system.
Add nosuid Option to /home
Medium Severity
The
nosuid
mount option can be used to prevent execution of setuid programs in
/home
. The SUID and SGID permissions should not be required in these user data directories. Add the
nosuid
option to the fourth column of
/etc/fstab
for the line which controls mounting of
/home
.
Add nosuid Option to Removable Media Partitions
Medium Severity
The
nosuid
mount option prevents set-user-identifier (SUID) and set-group-identifier (SGID) permissions from taking effect. These permissions allow users to execute binaries with the same permissions as the owner and group of the file respectively. Users should not be allowed to introduce SUID and SGID files into the system via partitions mounted from removeable media. Add the
nosuid
option to the fourth column of
/etc/fstab
for the line which controls mounting of any removable media partitions.