Skip to main content

Insecure service configuration - SMTP

Description​

The hosting server has an open port (SMTP 25) which allows attackers to send emails using the web server.

Impact​

Send emails as anyone using the servers.

Recommendation​

Close unused ports to prevent SMTP relay attacks.

Threat​

Anonymous attacker from the Internet.

Expected Remediation Time​

⌚ 30 minutes.

Score​

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

Base​

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

Temporal​

  • Exploit code madurity: X
  • Remediation level: X
  • Report confidence: X

Result​

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

Code Examples​

Compliant code​

The smtp ports are securely configured

host_server:
  delivery_method: :smtp
  smtp_settings:
    enable_starttls_auto: true
    address: "address"
    port: 587
    domain: "promotions_domain"
    authentication: cipher_key
    user_name: "appadmin"
    time_delay: 24h

Non compliant code​

There are unsafe smtp ports opened

host_server:
  delivery_method: :smtp
  smtp_settings:
    enable_starttls_auto: true
    address: "address"
    port: 25
    domain: "yourdomain"
    authentication: plain
    user_name: "appadmin"

Requirements​

free trial

Search for vulnerabilities in your apps for free with our automated security testing! Start your 21-day free trial and discover the benefits of our Continuous Hacking Machine Plan. If you prefer a full service that includes the expertise of our ethical hackers, don't hesitate to contact us for our Continuous Hacking Squad Plan.