| Dmitry Teselkin | d87f461 | 2018-08-16 11:29:55 +0300 | [diff] [blame^] | 1 | # 1.1.1.8 Ensure mounting of FAT filesystems is disabled |
| 2 | # |
| 3 | # Description |
| 4 | # =========== |
| 5 | # The FAT filesystem format is primarily used on older windows systems and |
| 6 | # portable USB drives or flash modules. It comes in three types FAT12, FAT16, |
| 7 | # and FAT32 all of which are supported by the vfat kernel module. |
| 8 | # |
| 9 | # Rationale |
| 10 | # ========= |
| 11 | # Removing support for unneeded filesystem types reduces the local attack |
| 12 | # surface of the server. If this filesystem type is not needed, disable it. |
| 13 | # |
| 14 | # Audit |
| 15 | # ===== |
| 16 | # Run the following commands and verify the output is as indicated: |
| 17 | # |
| 18 | # # modprobe -n -v vfat |
| 19 | # install /bin/true |
| 20 | # # lsmod | grep vfat |
| 21 | # <No output> |
| 22 | # |
| 23 | # Remediation |
| 24 | # =========== |
| 25 | # |
| 26 | # Edit or create the file /etc/modprobe.d/CIS.conf and add the following line: |
| 27 | # |
| 28 | # install vfat /bin/true |
| 29 | # |
| 30 | # Impact |
| 31 | # ====== |
| 32 | # FAT filesystems are often used on portable USB sticks and other flash |
| 33 | # media are commonly used to transfer files between workstations, removing |
| 34 | # VFAT support may prevent the ability to transfer files in this way. |
| 35 | # |
| 36 | parameters: |
| 37 | linux: |
| 38 | system: |
| 39 | kernel: |
| 40 | module: |
| 41 | vfat: |
| 42 | install: |
| 43 | command: /bin/true |
| 44 | |