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Technical information leak - Errors

Description​

It is possible to cause the server to throw errors after analyzing the endpoints with different techniques such as: sending massive requests to the endpoint, sending massive characters in the body of the application.

Impact​

Obtain technical information from the server.

Recommendation​

Use generic messages to indicate server errors and avoid sending technical information.

Threat​

Authorized attacker from the Internet.

Expected Remediation Time​

⌚ 45 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: L
  • User interaction: N
  • Scope: U
  • Confidentiality: L
  • Integrity: N
  • Availability: N

Temporal​

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

Result​

  • Vector string: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N/E:X/RL:X/RC:X
  • Score:
    • Base: 4.3
    • Temporal: 4.3
  • Severity:
    • Base: Medium
    • Temporal: Medium

Code Examples​

Compliant code​

The response messages do not include any specific or sensitive information in the content

using System;
namespace API{
  public class Program{
    public static void Main(){
      BuildWebHost();
    }
    public static IWebHost BuildWebHost() =>
      WebHost.CreateDefaultBuilder()
        .Build();
  }
}

Non compliant code​

The application uses response messages that include sensitive information

using System;
namespace API {
  public class Program{
    public static void Main(){
      BuildWebHost();
    }
    public static IWebHost BuildWebHost() =>
      WebHost.CreateDefaultBuilder()
        .UseSetting(WebHostDefaults.DetailedErrorsKey, "true")
        .Build();
  }
}

Requirements​

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