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CIS Ubuntu 14.04 LTS - 1.3.2 Ensure filesystem integrity is regularly checked

DevOps & Security
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Verify that filesystem integrity checking is scheduled via cron to detect unauthorized changes

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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-v210-1-3-2/SKILL.md

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1.3.2 Ensure filesystem integrity is regularly checked (Scored)

Profile Applicability

  • Level 1 - Server
  • Level 1 - Workstation

Description

Periodic checking of the filesystem integrity is needed to detect changes to the filesystem.

Rationale

Periodic file checking allows the system administrator to determine on a regular basis if critical files have been changed in an unauthorized fashion.

Audit Procedure

Run the following commands to determine if there is a cron job scheduled to run the aide check:

crontab -u root -l | grep aide
grep -r aide /etc/cron.* /etc/crontab

Ensure a cron job in compliance with site policy is returned.

Expected Result

A cron job entry for AIDE should be returned showing scheduled integrity checks.

Remediation

Run the following command:

crontab -u root -e

Add the following line to the crontab:

0 5 * * * /usr/bin/aide --config /etc/aide/aide.conf --check

Default Value

No AIDE cron job is configured by default.

Notes

The checking in this recommendation occurs every day at 5am. Alter the frequency and time of the checks in compliance with site policy.

References

  • CIS Controls: 3.5 Use File Integrity Tools For Critical System Files

Profile

  • Level 1 - Server
  • Level 1 - Workstation