CVE-2008-4530 in Brilliant Gallery
Summary
by MITRE
Cross-site scripting (XSS) vulnerability in Brilliant Gallery 5.x before 5.x-4.2, a module for Drupal, allows remote authenticated users with permissions to inject arbitrary web script or HTML via unspecified vectors related to posting of answers.
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Analysis
by VulDB Data Team • 12/06/2017
The CVE-2008-4530 vulnerability represents a critical cross-site scripting flaw within the Brilliant Gallery module for Drupal, specifically affecting versions prior to 5.x-4.2. This vulnerability resides in the module's handling of user input during the posting of answers, creating a persistent security weakness that can be exploited by authenticated users who possess sufficient permissions within the Drupal environment. The flaw demonstrates how seemingly benign module functionality can become a vector for malicious code execution when proper input validation and output sanitization mechanisms are absent or inadequate.
The technical implementation of this vulnerability stems from insufficient validation of user-supplied data within the answer posting functionality of the Brilliant Gallery module. When authenticated users submit answers through the module's interface, the system fails to properly sanitize or escape the input before rendering it in the web page context. This allows attackers to inject malicious script code that executes in the context of other users' browsers who view the affected content. The vulnerability operates under CWE-79 which categorizes improper neutralization of input during web output, specifically manifesting as reflected and stored XSS conditions. The attack vector leverages the module's trust in user input without adequate sanitization, creating an environment where malicious payloads can persist and propagate through the application's user interface.
The operational impact of this vulnerability extends beyond simple script injection, as it can enable attackers to perform various malicious activities within the compromised Drupal environment. An attacker with permissions to post answers could potentially steal session cookies, redirect users to malicious websites, deface gallery content, or execute more sophisticated attacks such as privilege escalation within the application. The vulnerability is particularly dangerous because it requires minimal privileges to exploit, only needing access to the module's answer posting functionality, which many legitimate users possess. This makes it a significant concern for organizations that rely on Drupal's module ecosystem, as the attack surface expands with each additional module that may not properly validate user input. The vulnerability also aligns with ATT&CK technique T1059.007 for Command and Scripting Interpreter: JavaScript, demonstrating how attackers can leverage XSS to execute malicious JavaScript within victim browsers.
Mitigation strategies for CVE-2008-4530 should prioritize immediate patching of the Brilliant Gallery module to version 5.x-4.2 or later, which contains the necessary input sanitization fixes. Organizations should implement comprehensive input validation mechanisms across all user-facing interfaces within their Drupal installations, particularly focusing on any custom modules or contributed modules that handle user-generated content. The implementation of Content Security Policy (CSP) headers can provide additional defense-in-depth measures to prevent execution of unauthorized scripts even if XSS vulnerabilities exist elsewhere in the application. Regular security audits and code reviews should be conducted to identify similar input validation weaknesses in other modules and custom code implementations. System administrators should also consider implementing web application firewalls to detect and block suspicious input patterns that may indicate XSS attempts, while maintaining proper logging and monitoring to detect exploitation attempts. The vulnerability serves as a reminder of the critical importance of input sanitization and output encoding in preventing XSS attacks, reinforcing the need for security-conscious development practices throughout the software development lifecycle.