CVE-2017-9149 in Metadata Anonymisation Toolkit
Summary
by MITRE
Metadata Anonymisation Toolkit (MAT) 0.6 and 0.6.1 silently fails to perform "Clean metadata" actions upon invocation from the Nautilus contextual menu, which allows context-dependent attackers to obtain sensitive information by reading a file for which cleaning had been attempted.
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Analysis
by VulDB Data Team • 12/07/2022
The Metadata Anonymisation Toolkit (MAT) vulnerability CVE-2017-9149 represents a critical security flaw in the metadata sanitization process that affects versions 0.6 and 0.6.1 of the tool. This vulnerability manifests when users attempt to clean metadata from files through the Nautilus file manager's contextual menu interface, creating a scenario where the sanitization operation appears to complete successfully while actually failing to remove sensitive information from the target files. The issue stems from the tool's improper error handling mechanism that silently ignores failures during the metadata cleaning process, allowing attackers to remain unaware of the incomplete sanitization. This behavior creates a false sense of security for users who believe their files have been properly sanitized when in fact sensitive metadata remains accessible. The vulnerability specifically targets the integration between MAT and the Nautilus file manager, where the contextual menu execution path does not properly validate or report the success status of metadata cleaning operations. According to CWE classification, this vulnerability maps to CWE-459: Incomplete Cleanup, which describes the weakness where a system fails to properly clean up resources or data, leaving behind potentially sensitive information. The attack vector is context-dependent, requiring users to interact with the Nautilus interface and select the MAT cleaning function, making it a user-initiated attack that relies on social engineering or user trust in the tool's functionality. The operational impact of this vulnerability extends beyond simple information disclosure, as it can lead to the exposure of confidential metadata such as author information, creation dates, editing history, and other sensitive file attributes that may contain personal or organizational data.
The technical implementation of this flaw involves the failure of MAT to properly validate the execution status of its cleaning operations when invoked through the Nautilus contextual menu. When users right-click on a file and select the MAT cleaning option, the tool should either successfully remove all metadata or clearly indicate failure through appropriate error messaging. Instead, the system silently continues execution and reports success even when the cleaning process has not completed properly. This failure mode creates a dangerous illusion of security where users believe their files are clean when they actually contain residual metadata that can be extracted by attackers with appropriate tools or knowledge. The vulnerability operates at the intersection of file system integration and security tool functionality, where the integration layer between Nautilus and MAT does not properly handle error propagation or status reporting. The silent failure mechanism makes this vulnerability particularly insidious because it does not generate any visible alerts or error logs that would notify users of the failed operation. From an attack perspective, this vulnerability aligns with ATT&CK technique T1005: Data from Local System, as it allows adversaries to access sensitive information that should have been removed during the sanitization process. The vulnerability also relates to T1059: Command and Scripting Interpreter, as attackers may exploit the incomplete sanitization to gather information about file creation, modification, and user activities through the preserved metadata.
The implications of this vulnerability extend to organizations that rely on MAT for document sanitization and metadata removal, particularly in environments where sensitive information must be protected from unauthorized access. When users trust the tool to properly clean files but the cleaning process fails silently, it creates a security gap that can be exploited by attackers who may not require direct access to the files themselves. The vulnerability affects both individual users and enterprise environments where document security is paramount, such as legal, medical, or government organizations that handle confidential information. Organizations using MAT in automated workflows or batch processing scenarios may unknowingly continue processing files with residual metadata, creating systematic security weaknesses across their document management systems. The silent failure characteristic makes this vulnerability particularly dangerous in compliance environments where proper data sanitization is required for regulatory adherence. Security professionals should recognize that this vulnerability demonstrates the importance of proper error handling and status validation in security tools, as incomplete sanitization can undermine the entire security posture of an organization. The vulnerability also highlights the risks associated with third-party tool integrations, where the failure of one component to properly communicate status information can create cascading security issues. Organizations should implement additional verification mechanisms to ensure that metadata cleaning operations are actually successful, particularly when relying on automated or context-sensitive execution paths. The vulnerability serves as a reminder that security tools must provide clear feedback about their operations and must not silently fail in ways that compromise user security assumptions.