| name | cis-ubuntu1604-v200-4-1-14 |
| description | Ensure changes to system administration scope (sudoers) is collected |
| category | cis-logging |
| version | 2.0.0 |
| author | cyberstrike-official |
| tags | ["cis","ubuntu","linux","ubuntu-16.04","auditd","logging"] |
| cis_id | 4.1.14 |
| cis_benchmark | CIS Ubuntu Linux 16.04 LTS Benchmark v2.0.0 |
| tech_stack | ["ubuntu","linux"] |
| cwe_ids | [] |
| chains_with | [] |
| prerequisites | [] |
| severity_boost | {} |
CIS Ubuntu Linux 16.04 LTS Benchmark v2.0.0 - Control 4.1.14
Profile
- Level: 2 - Server
- Level: 2 - Workstation
- Assessment Status: Automated
Description
Monitor scope changes for system administrations. If the system has been properly configured to force system administrators to log in as themselves first and then use the sudo command to execute privileged commands, it is possible to monitor changes in scope. The file /etc/sudoers will be written to when the file or its attributes have changed. The audit records will be tagged with the identifier "scope."
Note: Reloading the auditd config to set active settings requires the auditd service to be restarted, and may require a system reboot.
Rationale
Changes in the /etc/sudoers file can indicate that an unauthorized change has been made to scope of system administrator activity.
Impact
None.
Audit Procedure
Command Line
Run the following commands:
grep scope /etc/audit/rules.d/*.rules
auditctl -l | grep scope
Verify output of both matches:
-w /etc/sudoers -p wa -k scope
-w /etc/sudoers.d/ -p wa -k scope
Expected Result
Output of both commands should match the rules listed above.
Remediation
Command Line
Edit or create a file in the /etc/audit/rules.d/ directory ending in .rules.
Example: vi /etc/audit/rules.d/50-scope.rules
Add the following lines:
-w /etc/sudoers -p wa -k scope
-w /etc/sudoers.d/ -p wa -k scope
Default Value
By default, no audit rules are configured for sudoers changes.
References
- CIS Ubuntu Linux 16.04 LTS Benchmark v2.0.0 - Section 4.1.14
CIS Controls
| Controls Version | Control |
|---|
| v7 | 4.8 Log and Alert on Changes to Administrative Group Membership - Configure systems to issue a log entry and alert when an account is added to or removed from any group assigned administrative privileges. |
