CVE-2011-3812 in Vanilla
Summary
by MITRE
Vanilla 2.0.16 allows remote attackers to obtain sensitive information via a direct request to a .php file, which reveals the installation path in an error message, as demonstrated by plugins/Minify/min/utils.php and certain other files.
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Analysis
by VulDB Data Team • 02/11/2019
The vulnerability identified as CVE-2011-3812 affects Vanilla 2.0.16, a popular web-based discussion forum platform that enables users to create online communities. This issue represents a critical information disclosure flaw that exposes sensitive system details to remote attackers through improper error handling mechanisms. The vulnerability specifically manifests when attackers make direct requests to php files within the application's directory structure, particularly targeting files such as plugins/Minify/min/utils.php and similar components within the software ecosystem.
The technical root cause of this vulnerability stems from the application's failure to properly sanitize error messages and handle direct file access attempts. When a remote attacker accesses specific php files directly rather than through the intended application interface, the system generates error messages that inadvertently reveal the complete installation path of the Vanilla forum on the server. This occurs because the application does not implement proper input validation or access control measures to prevent direct file execution, allowing malicious actors to bypass normal application flow and extract system-level information. The vulnerability operates under CWE-200, which categorizes information exposure issues where sensitive data is unintentionally disclosed to unauthorized parties, and aligns with ATT&CK technique T1212 for exploitation of information disclosure vulnerabilities.
The operational impact of this vulnerability extends beyond simple path disclosure, as it provides attackers with crucial system architecture information that can facilitate subsequent exploitation attempts. The revealed installation paths can be leveraged to craft more sophisticated attacks targeting specific file locations, potentially enabling attackers to identify other vulnerable components within the same system. Additionally, this information disclosure creates opportunities for attackers to map the application's internal structure, identify version-specific vulnerabilities, and plan targeted attacks against known weaknesses in the Vanilla platform or its dependencies. The vulnerability is particularly concerning because it affects core application files that are part of the standard installation, making it readily exploitable across all affected systems.
Organizations running Vanilla 2.0.16 should immediately implement multiple layers of mitigation strategies to address this vulnerability. The primary remediation involves updating to a patched version of Vanilla that addresses the information disclosure issue through improved error handling and access control mechanisms. System administrators should also implement proper file access controls that prevent direct execution of php files outside of the intended application workflow, utilizing web server configuration settings to restrict access to sensitive directories. Additionally, implementing comprehensive logging and monitoring of file access attempts can help detect and respond to exploitation attempts. Security measures should include regular vulnerability assessments to identify similar issues in other web applications and ensure that error handling practices follow security best practices to prevent unintended information disclosure. The mitigation approach should align with security frameworks that emphasize defense in depth and proper input validation to prevent similar vulnerabilities from occurring in other parts of the application infrastructure.