CVE-2012-2703 in Advertisement
Summary
by MITRE
Cross-site scripting (XSS) vulnerability in the Advertisement module 6.x-2.x before 6.x-2.3 for Drupal, when debug mode is enabled, allows remote attackers to inject arbitrary web script or HTML via vectors related to the "$conf variable in settings.php."
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Analysis
by VulDB Data Team • 02/17/2019
The CVE-2012-2703 vulnerability represents a critical cross-site scripting flaw within the Advertisement module for Drupal version 6.x-2.x, specifically affecting versions prior to 6.x-2.3. This vulnerability manifests when the Drupal debug mode is enabled, creating a dangerous condition where remote attackers can execute malicious web scripts or HTML code within the context of affected user sessions. The flaw exploits the insecure handling of the "$conf variable in settings.php" which serves as a critical configuration point within the Drupal framework.
The technical implementation of this vulnerability stems from inadequate input validation and output sanitization within the Advertisement module's codebase. When debug mode is active, the system's configuration variables including the "$conf variable" are processed without proper escaping or sanitization measures. This creates an injection point where attacker-controlled data can be seamlessly integrated into the web page output, bypassing standard security mechanisms designed to prevent XSS attacks. The vulnerability specifically targets the way Drupal handles configuration variables during the debug process, making it particularly dangerous as it operates within the legitimate application context.
The operational impact of CVE-2012-2703 extends beyond simple script injection, as it can enable attackers to perform session hijacking, steal sensitive user data, redirect users to malicious websites, or even execute more sophisticated attacks through the compromised session. The vulnerability's exploitation becomes significantly more dangerous when considering that debug mode is often enabled in development environments, making it a potential target for attackers who can gain access to these configurations. This flaw directly violates the principle of least privilege and can lead to complete compromise of user sessions and potentially the entire Drupal installation. The vulnerability aligns with CWE-79 which specifically addresses cross-site scripting flaws in web applications, and can be mapped to ATT&CK technique T1059.007 for script injection attacks.
Organizations affected by this vulnerability should immediately implement several mitigation strategies to protect their Drupal installations. The primary recommendation involves upgrading to Advertisement module version 6.x-2.3 or later, which contains the necessary patches to address the XSS vulnerability. Additionally, administrators should disable debug mode in production environments, as this significantly reduces the attack surface. Input validation should be strengthened throughout the application, with particular attention to how configuration variables are processed and output. Network-level protections such as web application firewalls can provide additional defense-in-depth measures, though they should not be considered a replacement for proper code-level fixes. The vulnerability demonstrates the importance of proper security testing during development and the critical need for secure configuration management practices. Regular security audits and monitoring of configuration files like settings.php should be implemented to prevent similar issues from arising in the future.