| name | cis-ubuntu1804-v220-1-7-6 |
| description | Ensure permissions on /etc/issue.net are configured |
| category | cis-networking |
| version | 2.2.0 |
| author | cyberstrike-official |
| tags | ["cis","ubuntu","linux","ubuntu-18.04","issue-net","permissions","file-permissions"] |
| cis_id | 1.7.6 |
| cis_benchmark | CIS Ubuntu Linux 18.04 LTS Benchmark v2.2.0 |
| tech_stack | ["ubuntu","linux"] |
| cwe_ids | [] |
| chains_with | [] |
| prerequisites | [] |
| severity_boost | {} |
1.7.6 Ensure permissions on /etc/issue.net are configured (Automated)
Profile Applicability
- Level 1 - Server
- Level 1 - Workstation
Description
The contents of the /etc/issue.net file are displayed to users prior to login for remote connections from configured services.
Rationale
If the /etc/issue.net file does not have the correct ownership it could be modified by unauthorized users with incorrect or misleading information.
Audit Procedure
Command Line
Run the following command and verify Access is 644 or more restrictive and Uid and Gid are both 0/root:
stat -Lc 'Access: (%#a/%A) Uid: ( %u/ %U) Gid: ( %g/ %G)' /etc/issue.net
Expected Result
Access: (0644/-rw-r--r--) Uid: ( 0/ root) Gid: ( 0/ root)
Remediation
Command Line
Run the following commands to set permissions on /etc/issue.net:
chown root:root $(readlink -e /etc/issue.net)
chmod u-x,go-wx $(readlink -e /etc/issue.net)
Default Value
Access: (0644/-rw-r--r--) Uid: ( 0/ root) Gid: ( 0/ root)
References
- NIST SP 800-53 Rev. 5: AC-3, MP-2
CIS Controls
| Controls Version | Control | IG 1 | IG 2 | IG 3 |
|---|
| v8 | 3.3 Configure Data Access Control Lists | X | X | X |
| v7 | 14.6 Protect Information through Access Control Lists | X | X | X |
MITRE ATT&CK Mappings
| Techniques / Sub-techniques | Tactics | Mitigations |
|---|
| T1222, T1222.002 | TA0005 | M1022 |
