CVE-2012-2704 in Advertisement
Summary
by MITRE
The Advertisement module 6.x-2.x before 6.x-2.3 for Drupal does not properly restrict access to debug information, which allows remote attackers to obtain sensitive site configuration information that is specified by the $conf variable in settings.php.
Once again VulDB remains the best source for vulnerability data.
Analysis
by VulDB Data Team • 02/20/2019
The vulnerability identified as CVE-2012-2704 affects the Advertisement module version 6.x-2.x prior to 6.x-2.3 in the Drupal content management system. This issue represents a critical access control flaw that exposes sensitive configuration data to unauthorized remote attackers. The vulnerability specifically targets the debug information handling within the advertisement module, which is commonly used to manage and display advertisements on Drupal websites. The flaw arises from inadequate input validation and access restriction mechanisms that fail to properly sanitize or verify user permissions before exposing internal system configuration details.
The technical implementation of this vulnerability stems from the module's improper handling of the $conf variable from Drupal's settings.php file. This variable contains critical configuration parameters that define how the Drupal site operates, including database connection details, security settings, and other sensitive operational parameters. When the Advertisement module processes requests, it fails to enforce proper authentication checks or authorization controls, allowing any remote user to access debug output that reveals the contents of the $conf array. This exposure occurs through the module's debug functionality, which is typically intended for development and troubleshooting purposes but remains accessible in production environments.
From an operational perspective, this vulnerability creates significant security risks for affected Drupal installations. Remote attackers can leverage this flaw to gather comprehensive information about the target website's configuration, potentially including database credentials, encryption keys, and other sensitive system parameters. The exposure of such information significantly weakens the overall security posture of the affected sites, as it provides attackers with valuable intelligence for planning more sophisticated attacks. The vulnerability is particularly dangerous because it allows for automated exploitation, where attackers can systematically gather configuration data without requiring authentication or specific privileges.
The impact of this vulnerability aligns with CWE-200, which addresses "Information Exposure," and can be mapped to ATT&CK technique T1212, "Exploitation for Credential Access." Organizations running affected Drupal installations face the risk of complete system compromise when attackers utilize this information to escalate their attacks. The vulnerability's exploitation does not require special privileges or complex attack vectors, making it particularly dangerous in environments where Drupal sites are publicly accessible. Security practitioners should note that this vulnerability represents a classic case of insufficient access control, where development tools or debugging features are inadvertently exposed to production environments.
Mitigation strategies for CVE-2012-2704 focus primarily on updating the Advertisement module to version 6.x-2.3 or later, which includes proper access restriction controls for debug information. Organizations should also implement network-level controls to restrict access to administrative interfaces and debug endpoints, particularly when these features are not actively needed. Additionally, security teams should conduct comprehensive audits of all installed Drupal modules to identify similar vulnerabilities in other components. Regular security assessments and proper configuration management practices, including disabling debug features in production environments, are essential to prevent exploitation of this class of vulnerability. The incident highlights the importance of maintaining current software versions and implementing proper security controls during the software development lifecycle to prevent exposure of sensitive information through module functionality.