What is Exposure of Core Dump File (CWE-528)?

TL;DR: Exposure of Core Dump File to an Unauthorized Control Sphere (CWE-528) is a critical vulnerability where core dumps are stored or transferred in unauthorized locations, compromising system integrity and confidentiality. Fix it by securing the storage location.

What is Exposure of Core Dump File to an Unauthorized Control Sphere?

Exposure of Core Dump File to an Unauthorized Control Sphere (CWE-528) is a type of security vulnerability that occurs when core dump files are stored or transferred in directories accessible by unauthorized users. As defined by the MITRE Corporation under CWE-528, and classified by the OWASP Foundation under no direct mapping…

Quick Summary

Exposure of Core Dump File to an Unauthorized Control Sphere (CWE-528) is a critical vulnerability where core dumps are stored or transferred in directories accessible by unauthorized users. This can lead to data breaches and compromise system integrity, allowing attackers to access sensitive information from core dumps.

Jump to: Quick Summary · Exposure of Core Dump File to an Unauthorized Control Sphere Overview · How Exposure of Core Dump File to an Unauthorized Control Sphere Works · Business Impact of Exposure of Core Dump File to an Unauthorized Control Sphere · Exposure of Core Dump File to an Unauthorized Control Sphere Attack Scenario · How to Detect Exposure of Core Dump File to an Unauthorized Control Sphere · How to Fix Exposure of Core Dump File to an Unauthorized Control Sphere · Framework-Specific Fixes for Exposure of Core Dump File to an Unauthorized Control Sphere · How to Ask AI to Check Your Code for Exposure of Core Dump File to an Unauthorized Control Sphere · Exposure of Core Dump File to an Unauthorized Control Sphere Best Practices Checklist · Exposure of Core Dump File to an Unauthorized Control Sphere FAQ · Vulnerabilities Related to Exposure of Core Dump File to an Unauthorized Control Sphere · References · Scan Your Own Site

Exposure of Core Dump File to an Unauthorized Control Sphere Overview

What

Exposure of Core Dump File to an Unauthorized Control Sphere (CWE-528) is a security vulnerability where core dump files are stored or transferred in directories accessible by unauthorized users.

Why it matters

This can lead to data breaches and compromise system integrity, allowing attackers to access sensitive information from core dumps.

Where it occurs

It typically occurs on Linux systems, Unix-based environments, and web servers that do not properly secure the storage of core dump files.

Who is affected

Applications running in environments where core dump files are stored or transferred without proper security measures are at risk.

Who is NOT affected

Systems already using strict file permissions and restricted directories for storing core dumps are less likely to be affected.

How Exposure of Core Dump File to an Unauthorized Control Sphere Works

Root Cause

The root cause lies in the improper storage or transfer of core dump files, making them accessible by unauthorized users.

Attack Flow

1. An attacker identifies a location where core dump files are stored.
2. The attacker gains access to these files and extracts sensitive information from them.

Prerequisites to Exploit

• Core dump files must be stored in directories with insufficient security controls.
• Unauthorized users must have the ability to access these directories.

Vulnerable Code

# Example of storing core dumps in an insecure directory
import os

def store_core_dump(file_path):
    # Store core dump file in a public directory
    os.system(f"mkdir -p /var/www/core_dumps")
    os.system(f"cp {file_path} /var/www/core_dumps/")

Secure Code

# Example of storing core dumps securely with restricted permissions
import os
import stat

def store_core_dump(file_path):
    # Store core dump file in a secure directory with restricted permissions
    os.makedirs("/var/log/core_dumps", mode=0o750, exist_ok=True)
    os.chmod("/var/log/core_dumps", 0o750)
    os.system(f"cp {file_path} /var/log/core_dumps/")

Business Impact of Exposure of Core Dump File to an Unauthorized Control Sphere

Confidentiality

Sensitive data from core dumps can be read by unauthorized users, leading to potential data breaches.

Integrity

Unrestricted access to core dump files may allow attackers to modify or tamper with sensitive information stored in them.

Availability

Attackers could disrupt the availability of critical services if they gain control over core dump storage directories.

Exposure of Core Dump File to an Unauthorized Control Sphere Attack Scenario

1. An attacker identifies a web server storing core dumps in a public directory.
2. The attacker gains access to these files and extracts sensitive information from them, compromising system integrity.

How to Detect Exposure of Core Dump File to an Unauthorized Control Sphere

Manual Testing

• Check file permissions for directories containing core dump files.
• Verify that core dumps are stored in restricted directories with proper security controls.

Automated Scanners (SAST/DAST)

Static analysis can detect insecure storage locations, while dynamic testing can identify unauthorized access attempts.

PenScan Detection

PenScan’s scanner engines like ZAP and Wapiti actively scan for this vulnerability.

False Positive Guidance

False positives may occur if core dumps are stored in directories that appear to be public but have strict security controls in place.

How to Fix Exposure of Core Dump File to an Unauthorized Control Sphere

• Protect core dump files from unauthorized access by setting appropriate file permissions.
• Ensure core dumps are stored in restricted directories with limited access rights.

Framework-Specific Fixes for Exposure of Core Dump File to an Unauthorized Control Sphere

Java

// Securely store core dumps in a restricted directory
String secureDir = "/var/log/core_dumps";
new File(secureDir).mkdirs();
Files.setPosixFilePermissions(new File(secureDir), PosixFilePermissions.fromString("rwx------"));

Node.js

// Ensure core dumps are stored securely with restricted permissions
const fs = require('fs');
fs.mkdir('/var/log/core_dumps', { recursive: true }, (err) => {
  if (!err || err.code === 'EEXIST') {
    fs.chmodSync('/var/log/core_dumps', 0o750);
  }
});

Python/Django

# Securely store core dumps in a restricted directory with proper permissions
import os

secure_dir = "/var/log/core_dumps"
os.makedirs(secure_dir, mode=0o750, exist_ok=True)
os.chmod(secure_dir, 0o750)

PHP

// Ensure core dumps are stored securely in a restricted directory with proper permissions
$secureDir = "/var/log/core_dumps";
mkdir($secureDir, 0750, true);
chmod($secureDir, 0750);

How to Ask AI to Check Your Code for Exposure of Core Dump File to an Unauthorized Control Sphere

Review the following [language] code block for potential CWE-528 Exposure of Core Dump File to an Unauthorized Control Sphere vulnerabilities and rewrite it using secure storage techniques: [paste code here]

Exposure of Core Dump File to an Unauthorized Control Sphere Best Practices Checklist

✅ Ensure core dump files are stored in restricted directories with proper file permissions. ✅ Regularly audit directory access controls for core dump storage locations. ✅ Implement strict security policies for handling and storing sensitive data.

Exposure of Core Dump File to an Unauthorized Control Sphere FAQ

How does Exposure of Core Dump File to an Unauthorized Control Sphere occur?

It occurs when a core dump file is stored or transferred in directories accessible by unauthorized users, leading to potential data breaches.

Why is Exposure of Core Dump File to an Unauthorized Control Sphere dangerous?

It allows attackers to access sensitive information from core dumps, compromising system integrity and confidentiality.

What are the typical consequences of Exposure of Core Dump File to an Unauthorized Control Sphere?

Attackers can read application data and files, leading to unauthorized access and potential misuse of confidential information.

How do I detect Exposure of Core Dump File to an Unauthorized Control Sphere in my codebase?

Manual testing involves checking file permissions and directory paths. Automated scanners like ZAP or Wapiti can also identify such vulnerabilities.

What are the best practices for preventing Exposure of Core Dump File to an Unauthorized Control Sphere?

Secure core dump files by setting appropriate access controls and ensuring they are stored in restricted directories.

How do I fix Exposure of Core Dump File to an Unauthorized Control Sphere once detected?

Protect core dump files from unauthorized access by configuring system settings and file permissions properly.

What should developers know about Exposure of Core Dump File to an Unauthorized Control Sphere when writing code?

Developers must ensure that core dumps are stored in secure locations with restricted access.

Vulnerabilities Related to Exposure of Core Dump File to an Unauthorized Control Sphere

References

• MITRE - CWE-528
• NVD - National Vulnerability Database

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 Exposure of Core Dump File to an Unauthorized Control Sphere and other risks before an attacker does.