Description

The SSH service is not filtered by the Firewall to avoid external attacks and possible intrusions through this service.

Impact

Attempt to access the server through brute force attacks or 0-day exploits.

Recommendation

Securely configure the vulnerable service so that it can only be accessed by authorized users.

Threat

External attacker without credentials.

Expected Remediation Time

⌚ 60 minutes.

Score

Default score using CVSS 3.1. It may change depending on the context of the src.

Base

• Attack vector: N
• Attack complexity: L
• Privileges required: N
• User interaction: N
• Scope: U
• Confidentiality: L
• Integrity: N
• Availability: N

Temporal

• Exploit code maturity: X
• Remediation level: O
• Report confidence: X

Result

• Vector string: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N/E:X/RL:O/RC:X
• Score:
• Base: 5.3
• Temporal: 5.1
• Severity:
• Base: Medium
• Temporal: Medium

Score 4.0

Default score using CVSS 4.0. It may change depending on the context of the src.

Base 4.0

• Attack vector: N
• Attack complexity: L
• Attack Requirements: N
• Privileges required: N
• User interaction: N
• Confidentiality (VC): L
• Integrity (VI): N
• Availability (VA): N
• Confidentiality (SC): N
• Integrity (SI): N
• Availability (SA): N

Threat 4.0

• Exploit maturity: X

Result 4.0

• Vector string: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/E:X
• Score:
• CVSS-BT: 6.9
• Severity:
• CVSS-BT: Medium

Compliant code

The service only allows safe access to certain users

                name: "myhost""
  AddressFamily: any
  AllowAgentForwarding: false
  AllowTcpForwarding: true
  ListenAddress: {{ ansible_default_ipv4.address }}:{{ ssh_port | default('22') }}
  PubkeyAuthentication: true
//Firewall configuration
hosts: myhost.com
  vars:
    ansible_port: "{{ ssh_port | default('22') }}"
  remote_user: sven
  become: true
  roles:
- hostnames
- users
- ssh
- my.firewall
  firewall_allowed_tcp_ports:
- 80
- 443
- 5930

            

Non compliant code

There is a resource with an SSH configuration allowing any address

                name: "myhost""
  AddressFamily: any
  AllowTcpForwarding: true
  ListenAddress: any

            

Requirements

• 266.Disable insecure functionalities

Fixes

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