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CIS Ubuntu 14.04 LTS - 1.1.19 Ensure noexec option set on removable media partitions

DevOps & Security
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Ensure noexec option is set on removable media partitions to prevent executable binaries

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Source SKILL.md: https://github.com/CyberStrikeus/CyberStrike/blob/HEAD/.cyberstrike/skill/CIS_benchmarks/Operating_Systems/Ubuntu/CIS_Ubuntu_Linux_14.04_LTS_Benchmark_v2.1.0/cis-ubuntu1404-v210-1-1-19/SKILL.md

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1.1.19 Ensure noexec option set on removable media partitions (Not Scored)

Profile Applicability

  • Level 1 - Server
  • Level 1 - Workstation

Description

The noexec mount option specifies that the filesystem cannot contain executable binaries.

Rationale

Setting this option on a file system prevents users from executing programs from the removable media. This deters users from being able to introduce potentially malicious software on the system.

Audit Procedure

# Run the following command and verify that the noexec option is set on all
# removable media partitions:
mount

Expected Result

All removable media partitions should have the noexec option set.

Remediation

# Edit the /etc/fstab file and add noexec to the fourth field (mounting options)
# of all removable media partitions. Look for entries that have mount points
# that contain words such as floppy or cdrom.
# See the fstab(5) manual page for more information.

Default Value

By default, the noexec option is not set on removable media partitions.

References

  • CIS Ubuntu Linux 14.04 LTS Benchmark v2.1.0
  • CIS Controls: 8 Malware Defenses

Profile

  • Level 1