CVE-2024-57556: Nbubna Store RCE Vulnerability

CVE-2024-57556 Overview

A Cross-Site Scripting (XSS) vulnerability exists in nbubna store version 2.14.2 and earlier. This vulnerability allows a remote attacker to execute arbitrary code via the store.deep.js component. The nbubna store library is a popular JavaScript library used for persistent local storage with automatic JSON parsing, making this vulnerability potentially impactful for web applications that utilize this component.

Critical Impact

Remote attackers can execute arbitrary JavaScript code in the context of a victim's browser session, potentially leading to session hijacking, data theft, or malicious actions performed on behalf of authenticated users.

Affected Products

• nbubna store version 2.14.2
• nbubna store versions prior to 2.14.2
• Applications utilizing the store.deep.js component

Discovery Timeline

• 2025-01-23 - CVE-2024-57556 published to NVD
• 2025-02-05 - Last updated in NVD database

Technical Details for CVE-2024-57556

Vulnerability Analysis

This Cross-Site Scripting vulnerability resides in the store.deep.js component of the nbubna store library. The vulnerability is classified as CWE-79 (Improper Neutralization of Input During Web Page Generation), which indicates insufficient sanitization of user-supplied input before it is rendered in a web page context.

The attack requires user interaction, as the victim must be tricked into interacting with malicious content. However, no authentication or special privileges are required to exploit this vulnerability. The scope is changed, meaning the vulnerable component impacts resources beyond its security scope, affecting both confidentiality and integrity of the application.

Root Cause

The root cause of this vulnerability is improper input validation and sanitization within the store.deep.js component. When user-controlled data is processed by this component, it fails to properly encode or escape special characters, allowing an attacker to inject malicious scripts that execute in the victim's browser context.

The deep property access functionality in the store library does not adequately sanitize values before they are stored or retrieved, creating an opportunity for XSS payload injection.

Attack Vector

The attack vector is network-based, requiring the attacker to craft a malicious payload that exploits the improper input handling in the store.deep.js component. The attack flow typically involves:

1. An attacker identifies an application using the vulnerable nbubna store library
2. The attacker crafts a malicious XSS payload targeting the store.deep.js component
3. The victim is tricked into interacting with the malicious content (via phishing, malicious link, etc.)
4. The malicious script executes in the victim's browser with the same privileges as the legitimate application
5. The attacker can then steal session tokens, capture sensitive data, or perform unauthorized actions

For technical details on the vulnerability mechanism and exploitation, refer to the GitHub Issue Discussion.

Detection Methods for CVE-2024-57556

Indicators of Compromise

• Unusual JavaScript execution patterns in browser developer tools or web application firewalls
• Unexpected network requests originating from client-side scripts to unknown external domains
• Reports of unexpected behavior from users interacting with pages utilizing the store library
• Log entries showing suspicious or encoded payloads in stored values

Detection Strategies

• Deploy web application firewalls (WAF) with XSS detection rules to identify and block malicious payloads
• Implement Content Security Policy (CSP) headers to restrict script execution sources
• Monitor application logs for attempts to store or retrieve data containing script tags or event handlers
• Use browser-based security tools to detect DOM manipulation attempts

Monitoring Recommendations

• Enable detailed logging for all interactions with the nbubna store library components
• Set up alerts for anomalous patterns in stored data that may indicate injection attempts
• Monitor for CSP violation reports which may indicate attempted XSS exploitation
• Conduct regular security scans of web applications using the affected library

How to Mitigate CVE-2024-57556

Immediate Actions Required

• Audit all applications using nbubna store library to identify instances of version 2.14.2 or earlier
• Review the store.deep.js component usage in your application codebase
• Implement input validation and output encoding as an additional defense layer
• Consider temporarily disabling or restricting functionality that relies on the vulnerable component until patching is possible

Patch Information

The vulnerability is tracked in the nbubna store GitHub repository. Refer to the GitHub Issue #127 for the latest information on patches and remediation guidance. Check for updated versions of the library that address this vulnerability and update your application's dependencies accordingly.

Workarounds

• Implement strict Content Security Policy (CSP) headers to limit script execution to trusted sources only
• Apply additional input validation and output encoding for all data processed by the store library
• Use HTML entity encoding for any user-supplied data before storing or displaying it
• Consider using alternative storage libraries that have been audited for XSS vulnerabilities until a patch is available

# Example CSP header configuration to mitigate XSS risks
# Add to your web server configuration or application headers

# Apache (.htaccess or httpd.conf)
Header set Content-Security-Policy "default-src 'self'; script-src 'self'; object-src 'none'"

# Nginx (nginx.conf)
add_header Content-Security-Policy "default-src 'self'; script-src 'self'; object-src 'none'" always;