CVE-2019-9491 in Anti-Threat Toolkit
Summary
by MITRE
Trend Micro Anti-Threat Toolkit (ATTK) versions 1.62.0.1218 and below have a vulnerability that may allow an attacker to place malicious files in the same directory, potentially leading to arbitrary remote code execution (RCE) when executed.
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Analysis
by VulDB Data Team • 10/23/2025
The vulnerability identified as CVE-2019-9491 affects Trend Micro Anti-Threat Toolkit version 1.62.0.1218 and earlier releases, presenting a critical security flaw that could enable remote code execution through improper file handling mechanisms. This vulnerability specifically resides within the file placement and execution processes of the ATTK utility, which is designed to analyze and neutralize malicious threats in enterprise environments. The flaw represents a significant concern for organizations relying on this security tool for threat detection and mitigation activities.
The technical implementation of this vulnerability stems from inadequate validation of file paths and execution contexts within the ATTK framework. When processing potentially malicious files, the toolkit fails to properly sanitize directory access controls and file placement mechanisms, allowing attackers to manipulate the file system through crafted inputs or compromised execution paths. This weakness enables attackers to place malicious payloads in directories that are subsequently executed by the toolkit, creating a privilege escalation path that can be leveraged for arbitrary code execution. The vulnerability manifests when the toolkit processes files without proper directory isolation or access control enforcement, particularly during automated threat analysis operations.
From an operational perspective, this vulnerability poses severe risks to enterprise security infrastructure, as the ATTK is commonly deployed in critical security operations centers where it handles potentially malicious files from various sources. Attackers could exploit this flaw by uploading specially crafted files that, when processed by the toolkit, would execute malicious code with the privileges of the toolkit process. This could result in complete system compromise, data exfiltration, or further lateral movement within the network. The impact extends beyond individual system compromise to potentially affect entire enterprise security workflows that depend on the toolkit for threat analysis and response activities. Organizations using this toolkit in production environments face significant risk of unauthorized access and system infiltration through this vulnerability.
Mitigation strategies for CVE-2019-9491 should prioritize immediate version updates to Trend Micro Anti-Threat Toolkit version 1.63.0.1220 or later, which contains the necessary patches to address the file handling and directory access control issues. Security administrators should implement network segmentation and access controls to limit the exposure of ATTK systems to untrusted inputs, while also monitoring for suspicious file processing activities. The vulnerability aligns with CWE-22 Path Traversal and CWE-78 Improper Neutralization of Special Elements used in an OS Command, representing a combination of directory traversal and command injection risks. Organizations should also consider implementing the ATT&CK technique T1059 Command and Scripting Interpreter to monitor for abnormal execution patterns that might indicate exploitation attempts. Additionally, implementing proper file integrity monitoring and endpoint detection systems can help identify unauthorized file placements that may indicate exploitation attempts. The vulnerability demonstrates the critical importance of secure file handling practices in security tools and highlights the potential for legitimate security software to become attack vectors when proper input validation is not implemented.