Cis Ubuntu1604 V200 1 1 1 3

---
name: cis-ubuntu1604-v200-1-1-1-3
description: "Ensure mounting of jffs2 filesystems is disabled"
category: cis-storage
version: "2.0.0"
author: cyberstrike-official
tags: [cis, ubuntu, linux, ubuntu-16.04, filesystem, jffs2, kernel-module]
cis_id: "1.1.1.3"
cis_benchmark: "CIS Ubuntu Linux 16.04 LTS Benchmark v2.0.0"
tech_stack: [ubuntu, linux]
cwe_ids: []
chains_with: []
prerequisites: []
severity_boost: {}
---

# Ensure mounting of jffs2 filesystems is disabled

## Description

The jffs2 (journaling flash filesystem 2) filesystem type is a log-structured filesystem used in flash memory devices.

## Rationale

Removing support for unneeded filesystem types reduces the local attack surface of the system. If this filesystem type is not needed, disable it.

## Impact

None noted.

## Audit Procedure

### Command Line

```bash
# modprobe -n -v jffs2 | grep -E '(jffs2|install)'
# lsmod | grep jffs2
```

## Expected Result

```
install /bin/true
```

The `lsmod` command should return no output.

## Remediation

### Command Line

```bash
# Edit or create a file in the /etc/modprobe.d/ directory ending in .conf
# Example: vi /etc/modprobe.d/jffs2.conf
# and add the following line:
install jffs2 /bin/true

# Run the following command to unload the jffs2 module:
rmmod jffs2
```

## Default Value

Not disabled by default.

## References

- CIS Controls Version 7 - 5.1 Establish Secure Configurations: Maintain documented, standard security configuration standards for all authorized operating systems and software.

## Profile

Level 1 - Server / Level 1 - Workstation, Assessment: Automated