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Insecure service configuration - SMB

Description​

SMBv1 is enabled, this version does not support encryption and has multiple vulnerabilities.

Impact​

Exploit known vulnerabilities found in the affected components.

Recommendation​

Disable SMBv1 and use SMBv3 version.

Threat​

Authenticated internal attacker.

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

Temporal​

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

Result​

  • Vector string: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N/E:P/RL:O/RC:X
  • Score:
    • Base: 4.4
    • Temporal: 4.0
  • Severity:
    • Base: Medium
    • Temporal: Medium

Code Examples​

Compliant code​

The SMBv3 version is used

public static void CreateTestMessage(string server){
  SmbClient client = new SmbClient(server);
  client.UseVersion = 3.1;
  client.Send(message);
}

Non compliant code​

The SMBv1 version is used by the application

public static void CreateTestMessage(string server){
  SmbClient client = new SmbClient(server);
  client.UseVersion = 1.0;
  client.Send(message);
}

Requirements​

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