CVE-2015-3296 in NodeBB
Summary
by MITRE
Multiple cross-site scripting (XSS) vulnerabilities in NodeBB before 0.7 allow remote attackers to inject arbitrary web script or HTML via vectors related to (1) javascript: or (2) data: URLs.
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Analysis
by VulDB Data Team • 12/29/2022
The vulnerability identified as CVE-2015-3296 represents a critical cross-site scripting weakness in NodeBB versions prior to 0.7, exposing web applications to persistent security risks through improper input validation mechanisms. This vulnerability falls under the CWE-79 category of Cross-Site Scripting, specifically targeting the improper sanitization of user-supplied data that flows into web pages without adequate encoding or filtering. The flaw manifests when the application fails to properly validate or escape javascript: and data: URLs, allowing malicious actors to inject executable code that can compromise user sessions and data integrity.
The technical exploitation of this vulnerability occurs through the injection of malicious URLs containing javascript: or data: protocols into input fields or parameters within the NodeBB platform. When these malformed URLs are processed and rendered in web pages, they can trigger the execution of unauthorized scripts in the context of the victim's browser. This type of attack vector is particularly dangerous because javascript: URLs can execute arbitrary JavaScript code directly within the browser, while data: URLs can embed base64-encoded content that may contain malicious scripts or payloads. The vulnerability exists at the application layer where user input is not properly sanitized before being stored or displayed, creating persistent XSS attack surfaces.
The operational impact of CVE-2015-3296 extends beyond simple script injection, potentially enabling attackers to perform session hijacking, steal sensitive user information, manipulate data within the application, and even escalate privileges within the NodeBB environment. Attackers can leverage these vulnerabilities to create persistent backdoors, modify forum content, deface websites, or redirect users to malicious domains. The vulnerability affects the core functionality of NodeBB's user interface and content management system, making it particularly dangerous for community-driven platforms where user-generated content is prevalent. This weakness can also facilitate more sophisticated attacks such as credential theft through formjacking or browser exploitation techniques that target the underlying web technologies.
Mitigation strategies for this vulnerability require immediate patching of NodeBB to version 0.7 or later, which includes proper input sanitization and URL validation mechanisms. Organizations should implement comprehensive content security policies that restrict the execution of inline scripts and limit the use of javascript: and data: protocols in user-supplied content. The implementation of proper input validation, output encoding, and secure coding practices should be enforced throughout the application, with regular security audits and penetration testing to identify similar vulnerabilities. Additionally, security measures such as web application firewalls and regular monitoring of user-generated content can provide additional layers of protection. This vulnerability aligns with ATT&CK technique T1059.007 for JavaScript and T1566.001 for credential access through web applications, emphasizing the need for comprehensive security controls across multiple attack vectors.