What is External Influence of Sphere Definition (CWE-673)?

TL;DR: External Influence of Sphere Definition (CWE-673) is a security misconfiguration where external actors can define control spheres, leading to potential data breaches and other security issues. Implementing strict controls prevents unauthorized manipulation.

What is External Influence of Sphere Definition?

External Influence of Sphere Definition (CWE-673) is a type of security misconfiguration vulnerability where the product does not prevent external actors from defining control spheres. As defined by the MITRE Corporation under CWE-673, and classified by the OWASP Foundation as Not directly mapped.

Quick Summary

External Influence of Sphere Definition allows unauthorized manipulation of system resources through configuration settings influenced by external entities. This can lead to data breaches and other security issues. Jump to: Overview · How It Works · Business Impact · Attack Scenario · Detection · Fix

Jump to: Quick Summary · External Influence of Sphere Definition Overview · How External Influence of Sphere Definition Works · Business Impact of External Influence of Sphere Definition · External Influence of Sphere Definition Attack Scenario · How to Detect External Influence of Sphere Definition · How to Fix External Influence of Sphere Definition · Framework-Specific Fixes for External Influence of Sphere Definition · How to Ask AI to Check Your Code for External Influence of Sphere Definition · External Influence of Sphere Definition Best Practices Checklist · External Influence of Sphere Definition FAQ · Vulnerabilities Related to External Influence of Sphere Definition · References · Scan Your Own Site

External Influence of Sphere Definition Overview

What: CWE-673 is a misconfiguration where an application allows external actors to define control spheres.

Why it matters: This vulnerability can lead to unauthorized access and manipulation of system resources, compromising security.

Where it occurs: In applications that allow external inputs to influence configuration settings.

Who is affected: Any system with improperly controlled configuration settings exposed to external input.

Who is NOT affected: Systems where control spheres are strictly defined internally without external influence.

How External Influence of Sphere Definition Works

Root Cause

The root cause lies in the lack of proper controls that prevent external actors from defining or influencing control spheres within an application’s configuration.

Attack Flow

1. An attacker identifies a way to inject unauthorized definitions into control spheres.
2. The system processes these definitions without validation, leading to misconfiguration.
3. The misconfigured settings are exploited by the attacker.

Prerequisites to Exploit

• External inputs must be able to influence control sphere definitions.
• Lack of proper validation and sanitization mechanisms for external input.

Vulnerable Code

def define_control_sphere(input):
    # No validation or sanitization applied
    config['sphere'] = input

define_control_sphere(request.form['sphere'])

This code allows an attacker to inject malicious control sphere definitions without any checks.

Secure Code

def define_control_sphere(input, allowed_values):
    if input not in allowed_values:
        raise ValueError('Invalid control sphere definition')
    config['sphere'] = input

define_control_sphere(request.form['sphere'], ['value1', 'value2'])

The secure code enforces an allowlist of valid values for the control sphere definitions.

Business Impact of External Influence of Sphere Definition

Confidentiality: Exposed data and access to sensitive information.

• Example: Unauthorized access to system configurations leading to exposure of secrets.

Integrity: Manipulation or corruption of data integrity.

• Example: Malicious modifications to configuration settings causing data inconsistencies.

Availability: Disruption of service availability.

• Example: Misconfigured systems leading to downtime due to incorrect resource allocation.

Business Consequences

• Financial losses from compromised data and services.
• Compliance violations due to security misconfigurations.
• Reputational damage from publicized breaches or outages.

External Influence of Sphere Definition Attack Scenario

1. An attacker identifies a vulnerable endpoint that allows external control sphere definitions.
2. The attacker sends malicious input through this endpoint.
3. The system processes the input and updates configuration settings accordingly.
4. The misconfigured settings are exploited to gain unauthorized access or cause disruptions.

How to Detect External Influence of Sphere Definition

Manual Testing

• Check for endpoints that allow external control sphere definitions without validation.
• Review configuration management practices for proper sanitization mechanisms.

Automated Scanners (SAST / DAST)

Static analysis can identify code patterns allowing external input into control spheres. Dynamic testing confirms the actual impact in runtime environments.

PenScan Detection

PenScan’s scanners such as ZAP and Nuclei detect misconfigurations that allow external influence on control sphere definitions.

False Positive Guidance

False positives may occur if configurations appear suspicious but are actually safe due to context not visible in static analysis. Ensure proper validation is present before marking findings as false positives.

How to Fix External Influence of Sphere Definition

• Implement strict controls and validation mechanisms for defining control spheres.
• Enforce an allowlist of valid values for external inputs influencing configuration settings.
• Regularly audit configurations to ensure they are not influenced by unauthorized sources.

Framework-Specific Fixes for External Influence of Sphere Definition

Java

public void defineControlSphere(String input, List<String> allowedValues) {
    if (!allowedValues.contains(input)) {
        throw new IllegalArgumentException("Invalid control sphere definition");
    }
    config.setSphere(input);
}

Node.js

function defineControlSphere(input, allowedValues) {
    if (allowedValues.includes(input)) {
        config.sphere = input;
    } else {
        throw new Error('Invalid control sphere definition');
    }
}

defineControlSphere(request.body.sphere, ['value1', 'value2']);

Python/Django

def define_control_sphere(request):
    allowed_values = ['value1', 'value2']
    if request.POST['sphere'] not in allowed_values:
        raise ValueError('Invalid control sphere definition')
    config['sphere'] = request.POST['sphere']

define_control_sphere(request)

PHP

function defineControlSphere($input, $allowedValues) {
    if (!in_array($input, $allowedValues)) {
        throw new Exception("Invalid control sphere definition");
    }
    $config['sphere'] = $input;
}

defineControlSphere($_POST['sphere'], ['value1', 'value2']);

How to Ask AI to Check Your Code for External Influence of Sphere Definition

Review the following [language] code block for potential CWE-673 External Influence of Sphere Definition vulnerabilities and rewrite it using secure configuration practices:

External Influence of Sphere Definition Best Practices Checklist

✅ Implement strict validation mechanisms for external inputs influencing control spheres. ✅ Enforce an allowlist of valid values for these inputs. ✅ Regularly audit configurations to ensure they are not influenced by unauthorized sources. ✅ Use secure configuration management practices that prevent external influence on system settings. ✅ Ensure proper sanitization and validation before processing any external input.

External Influence of Sphere Definition FAQ

How does External Influence of Sphere Definition occur in real applications?

It occurs when an application allows external actors to define control spheres, leading to potential security misconfigurations.

What are the typical consequences of External Influence of Sphere Definition?

This can lead to unauthorized access and manipulation of system resources by malicious actors.

How does one detect External Influence of Sphere Definition in code reviews?

Look for instances where external inputs define or influence control spheres within an application’s configuration.

What are the best practices to prevent External Influence of Sphere Definition?

Implement strict controls and validation mechanisms that prevent unauthorized modifications to system configurations by external entities.

How can developers use AI to check for External Influence of Sphere Definition vulnerabilities?

Use an AI coding assistant to review code for potential CWE-673 issues and rewrite it using secure configuration practices.

What are the common false positives when detecting External Influence of Sphere Definition?

False positives may occur if configurations appear suspicious but are actually safe due to context not visible in static analysis.

Vulnerabilities Related to External Influence of Sphere Definition

| CWE | Name | Relationship | |—|—|—| | CWE-664 | Improper Control of a Resource Through its Lifetime (ChildOf) |

References

• MITRE: CWE-673
• NVD

Scan Your Own Site

Manual code review catches what you know to look for. An automated scan catches what you didn’t. Scan your own website using PenScan to find External Influence of Sphere Definition and other risks before an attacker does.