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Security controls bypass or absence - Firewall

Description​

The firewall security verifications either do not exist or can be bypassed.

Impact​

Bypass security validations to perform diferent attacks.

Recommendation​

Guarantee that firewall security mechanisms and access rules are active and cannot be bypassed.

Threat​

Anonymous attacker from the Internet.

Expected Remediation Time​

⌚ 60 minutes.

Score​

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

Base​

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

Temporal​

  • Exploit code madurity: H
  • Remediation level: U
  • Report confidence: C

Result​

  • Vector string: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N/E:H/RL:U/RC:C
  • Score:
    • Base: 3.7
    • Temporal: 3.7
  • Severity:
    • Base: Low
    • Temporal: Low

Code Examples​

Compliant code​

The firewall is safely configured over a secure port

gateway: "My gateway name"
firewall_service:
  enabled: true
  policy: 'drop'
  log_default_action: true
  firewall_rules:
  - :id: '1'
    :enabled: true
    :description: 'disallow_conections'
    :policy: 'disallow'
    :destination_port_range: '5353'
    :destination_ip: '00.01.02.03'
    :source_port_range: '5353'
    :source_ip: 'Any'

Non compliant code​

The firewall configuration allows insecure port connections through its configuration files

gateway: "My gateway name"
firewall_service:
  enabled: true
  policy: 'drop'
  log_default_action: true
  firewall_rules:
  - :id: '1'
    :enabled: true
    :description: 'allow_conections'
    :policy: 'allow'
    :destination_port_range: '*'
    :destination_ip: '00.01.02.03'
    :source_port_range: '*'
    :source_ip: 'Any'

Requirements​