CVE-2002-2070 in SecureClean
Summary
by MITRE
SecureClean 3 build 2.0 does not clear Windows alternate data streams that are attached to files on NTFS file systems, which allows attackers to recover sensitive information that was supposed to be deleted.
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Analysis
by VulDB Data Team • 07/08/2024
The vulnerability described in CVE-2002-2070 represents a critical flaw in the SecureClean 3 build 2.0 software's approach to data sanitization on Windows NTFS file systems. This issue stems from the software's failure to properly handle alternate data streams that are inherent to the NTFS file system architecture, creating a persistent security risk that undermines the intended purpose of data deletion operations. The vulnerability specifically targets the Windows alternate data streams functionality, which allows multiple data streams to be associated with a single file, a feature that enables sophisticated data storage and retrieval mechanisms while potentially creating hidden data channels that traditional deletion methods cannot address.
The technical root cause of this vulnerability lies in the software's incomplete implementation of file deletion procedures that fail to account for NTFS alternate data streams. When SecureClean 3 performs deletion operations, it only removes the primary data stream of files while leaving alternate data streams intact on the file system. These alternate data streams can contain sensitive information that was supposed to be permanently removed, creating a data recovery vector that attackers can exploit. The flaw demonstrates a fundamental misunderstanding of how NTFS file systems operate, where files can have multiple streams of data associated with them, and the primary stream is not the only location where information might persist after deletion.
From an operational perspective, this vulnerability creates a significant risk for organizations relying on SecureClean 3 for data sanitization purposes, as it effectively renders the software's deletion capabilities incomplete and potentially dangerous. Attackers can exploit this weakness by accessing the alternate data streams that contain previously deleted sensitive information, potentially recovering passwords, confidential documents, or other classified data that should have been permanently removed. The impact extends beyond simple data recovery, as it can lead to unauthorized access to systems, data breaches, and violations of data protection regulations. This vulnerability directly contradicts the core security principle that properly deleted data should be unrecoverable, creating a false sense of security for users who believe their data has been completely eliminated from the system.
The vulnerability aligns with CWE-572 which addresses the issue of calling of dangerous functions, specifically in the context of improper file system cleanup operations. It also maps to ATT&CK technique T1486 which involves data encryption for ransom, as the incomplete deletion creates a scenario where sensitive data remains accessible to unauthorized parties. Organizations using SecureClean 3 may inadvertently create a persistent data exposure risk that could be exploited by both external attackers and malicious insiders who understand how to access alternate data streams. The vulnerability demonstrates poor security engineering practices in handling file system operations and highlights the importance of understanding platform-specific features when implementing security tools.
Mitigation strategies should focus on either upgrading to a version of SecureClean that properly handles alternate data streams or implementing additional data sanitization procedures that specifically target NTFS alternate streams. System administrators should consider using specialized tools that can explicitly clear alternate data streams during the deletion process, or implement additional security controls such as file system auditing to monitor access to potentially sensitive alternate streams. Organizations should also conduct regular security assessments to identify any remaining data in alternate streams and implement proper data handling procedures that account for the complete file system structure. The vulnerability underscores the necessity of thorough testing and validation of security tools against platform-specific features and requirements, particularly when dealing with file system-level operations that have complex underlying architectures.