What is Generation of Error Message Containing (CWE-209)?

TL;DR: Generation of Error Message Containing Sensitive Information (CWE-209) is a vulnerability where error messages include sensitive data, exposing private information and increasing attack success rates. Fix by ensuring error messages contain minimal details.

What is Generation of Error Message Containing Sensitive Information?

Generation of Error Message Containing Sensitive Information (CWE-209) is a type of vulnerability where error messages include sensitive information about the environment, users, or data stored in the server. As defined by the MITRE Corporation under CWE-209, and classified by the OWASP Foundation under A10:2025 - Mishandling of Exceptional Conditions…

Quick Summary

Generation of Error Message Containing Sensitive Information is a serious security issue where error messages reveal sensitive information to users or attackers. This can expose private data and increase the chances of successful follow-up attacks. Jump to: Overview · How it Works · Business Impact · Attack Scenario · Detection · Fixes

Jump to: Quick Summary · Generation of Error Message Containing Sensitive Information Overview · How Generation of Error Message Containing Sensitive Information Works · Business Impact of Generation of Error Message Containing Sensitive Information · Generation of Error Message Containing Sensitive Information Attack Scenario · How to Detect Generation of Error Message Containing Sensitive Information · How to Fix Generation of Error Message Containing Sensitive Information · Framework-Specific Fixes for Generation of Error Message Containing Sensitive Information · How to Ask AI to Check Your Code for Generation of Error Message Containing Sensitive Information · Generation of Error Message Containing Sensitive Information Best Practices Checklist · Generation of Error Message Containing Sensitive Information FAQ · Vulnerabilities Related to Generation of Error Message Containing Sensitive Information · References · Scan Your Own Site

Generation of Error Message Containing Sensitive Information Overview

What

Generation of Error Message Containing Sensitive Information is a vulnerability where error messages include sensitive information about the environment, users, or data stored in the server.

Why it matters

This can expose private information and query logic, increasing the chances of successful follow-up attacks. Attackers may use this to refine their methods or extract passwords from logs.

Where it occurs

In web applications that generate detailed error messages containing sensitive information.

Who is affected

Developers and users of applications that do not properly handle errors by displaying minimal details.

Who is NOT affected

Applications that never construct paths/queries/commands from external input, or systems already using robust error handling mechanisms.

How Generation of Error Message Containing Sensitive Information Works

Root Cause

Error messages include sensitive information about the environment, users, or data stored in the server.

Attack Flow

1. An attacker triggers an application error.
2. The error message is displayed with detailed information.
3. The attacker uses this information to refine their attack strategy.

Prerequisites to Exploit

• Detailed error messages must be visible to attackers.
• Sensitive information must be included in these messages.

Vulnerable Code

def process_request(request):
    try:
        # Process request and generate an error
        raise Exception("Internal server error: " + str(request))
    except Exception as e:
        print(e)

This code displays detailed error messages, including user input, which can be exploited by attackers.

Secure Code

def process_request(request):
    try:
        # Process request and generate an error
        raise Exception("Internal server error")
    except Exception as e:
        log_error(str(e))

The secure code avoids displaying detailed information in error messages and logs errors instead, reducing the risk of sensitive data exposure.

Business Impact of Generation of Error Message Containing Sensitive Information

Confidentiality

Sensitive information about users or environment is exposed.

• Financial impact: Loss of customer trust and potential legal penalties for data breaches.
• Compliance impact: Non-compliance with regulations like GDPR, HIPAA, etc.

Integrity

No specific integrity impacts are mentioned in the Common Consequences section.

Availability

No specific availability impacts are mentioned in the Common Consequences section.

Generation of Error Message Containing Sensitive Information Attack Scenario

1. An attacker triggers an error by sending a malformed request.
2. The application responds with a detailed error message containing sensitive information.
3. The attacker uses this information to refine their attack strategy and launch further attacks.

How to Detect Generation of Error Message Containing Sensitive Information

Manual Testing

• Review error handling code for any instances where sensitive data is included in error messages.
• Check configuration settings like display_errors (PHP) or similar settings in other languages/frameworks.

Automated Scanners (SAST / DAST)

Static analysis can identify places where detailed error messages are generated, while dynamic testing can confirm if these messages are visible to attackers.

PenScan Detection

PenScan’s scanner engines such as ZAP and Wapiti detect instances of detailed error messages being displayed to users or logged improperly.

False Positive Guidance

A real finding will show sensitive information in error messages, whereas a false positive would be an error message that does not contain any sensitive data.

How to Fix Generation of Error Message Containing Sensitive Information

• Ensure error messages only contain minimal details useful to the intended audience.
• Handle exceptions internally and do not display errors containing potentially sensitive information to users.
• Use naming conventions and strong types to make it easier to spot when sensitive data is being used.
• Avoid inconsistent messaging that might accidentally tip off an attacker about internal state.

Framework-Specific Fixes for Generation of Error Message Containing Sensitive Information

Java

try {
    // Process request and generate an error
    throw new RuntimeException("Internal server error");
} catch (Exception e) {
    logger.error(e.getMessage());
}

This code avoids displaying detailed information in error messages and logs errors instead, reducing the risk of sensitive data exposure.

Node.js

try {
    // Process request and generate an error
    throw new Error("Internal server error");
} catch (e) {
    console.log('Server error:', e.message);
}

This code avoids displaying detailed information in error messages and logs errors instead, reducing the risk of sensitive data exposure.

Python/Django

try:
    # Process request and generate an error
    raise Exception("Internal server error")
except Exception as e:
    logger.error(str(e))

This code avoids displaying detailed information in error messages and logs errors instead, reducing the risk of sensitive data exposure.

PHP

try {
    // Process request and generate an error
    throw new Exception("Internal server error");
} catch (Exception $e) {
    error_log($e->getMessage());
}

This code avoids displaying detailed information in error messages and logs errors instead, reducing the risk of sensitive data exposure.

How to Ask AI to Check Your Code for Generation of Error Message Containing Sensitive Information

Manual code review catches what you know to look for. An automated scan catches what you didn’t. Use an AI coding assistant to check your code for CWE-209 vulnerabilities.

Generation of Error Message Containing Sensitive Information Best Practices Checklist

• ✅ Ensure error messages only contain minimal details useful to the intended audience.
• ✅ Handle exceptions internally and do not display errors containing potentially sensitive information to users.
• ✅ Use naming conventions and strong types to make it easier to spot when sensitive data is being used.
• ✅ Avoid inconsistent messaging that might accidentally tip off an attacker about internal state.

Generation of Error Message Containing Sensitive Information FAQ

How does Generation of Error Message Containing Sensitive Information occur?

It occurs when error messages include sensitive information about the environment, users, or data stored in the server.

What are common impacts of Generation of Error Message Containing Sensitive Information?

This can reveal private information and expose query logic, increasing the chances of a successful attack.

How do attackers exploit Generation of Error Message Containing Sensitive Information?

Attackers use detailed error messages to refine their attacks or extract sensitive data like passwords from logs.

What is the primary fix for Generation of Error Message Containing Sensitive Information?

Ensure error messages are minimal and do not reveal sensitive information, such as using log files instead of displaying errors.

How can I detect Generation of Error Message Containing Sensitive Information in my application?

Use automated scanners to identify instances where detailed error messages are displayed to users or logged improperly.

What are some best practices for preventing Generation of Error Message Containing Sensitive Information?

Handle exceptions internally, avoid inconsistent messaging that might leak information about internal state, and use naming conventions to separate sensitive data.

How can I configure my environment to prevent Generation of Error Message Containing Sensitive Information?

Disable error display settings in configurations like PHP’s display_errors or use default error pages that do not reveal any information.

Vulnerabilities Related to Generation of Error Message Containing Sensitive Information

| CWE | Name | Relationship | |—|—|—| | CWE-200 | Exposure of Sensitive Information to an Unauthorized Actor (ChildOf) | ChildOf | | CWE-755 | Improper Handling of Exceptional Conditions (ParentOf) | ParentOf |

References

• MITRE - Generation of Error Message Containing Sensitive Information
• OWASP - Mishandling of Exceptional Conditions
• CAPEC - Error Handling Issues
• 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 Generation of Error Message Containing Sensitive Information and other risks before an attacker does.