CVE-2008-0569 in Comment Upload Module
Summary
by MITRE
The Comment Upload 4.7.x before 4.7.x-0.1 and 5.x before 5.x-0.1 module for Drupal does not properly use functions in the upload module, which allows remote attackers to bypass upload validation, and upload arbitrary files and possibly execute arbitrary code, via unspecified vectors.
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Analysis
by VulDB Data Team • 11/06/2017
The vulnerability identified as CVE-2008-0569 affects the Comment Upload module for Drupal content management systems, specifically versions 4.7.x prior to 4.7.x-0.1 and 5.x prior to 5.x-0.1. This represents a critical security flaw that undermines the fundamental file upload validation mechanisms within the Drupal platform. The vulnerability stems from improper implementation of upload module functions that should have enforced strict validation controls to prevent malicious file uploads. The flaw exists in the module's handling of user-submitted comments that include file attachments, creating a pathway for attackers to circumvent the intended security measures.
The technical nature of this vulnerability falls under CWE-434, which addresses "Unrestricted Upload of File with Dangerous Type," and demonstrates how inadequate input validation can lead to arbitrary code execution. Attackers can exploit this weakness by crafting specially prepared file uploads that bypass the validation checks designed to prevent execution of potentially harmful file types. The vulnerability's unspecified vectors suggest that multiple attack surfaces within the comment upload functionality could be leveraged, making it particularly dangerous as it may not be easily predictable or preventable through standard security measures. The improper use of upload module functions essentially creates a backdoor that allows unauthorized file operations to proceed without proper verification.
The operational impact of this vulnerability is severe and multifaceted, potentially enabling remote code execution on affected Drupal installations. When attackers successfully bypass the upload validation, they can upload malicious files such as web shells, scripts, or other executable content that can be executed within the web server context. This creates a persistent threat vector that could allow attackers to gain full control over the affected systems, potentially leading to data breaches, service disruption, or further network infiltration. The vulnerability affects the core integrity of the Drupal platform's file handling security model, undermining the trust in the system's ability to properly validate user inputs.
From a mitigation perspective, the primary solution involves upgrading to patched versions of the Comment Upload module, specifically versions 4.7.x-0.1 and 5.x-0.1 or later. System administrators should also implement additional defensive measures including restricting file upload capabilities to trusted users only, implementing more robust file type validation, and monitoring upload directories for suspicious activity. The vulnerability aligns with ATT&CK technique T1190, "Exploit Public-Facing Application," and T1059, "Command and Scripting Interpreter," as it enables attackers to exploit the application's public interface to execute malicious code. Organizations should also consider implementing web application firewalls and conducting regular security assessments to identify similar vulnerabilities in their Drupal installations. The incident highlights the critical importance of proper input validation and the potential consequences of inadequate security controls in content management systems.