CVE-2019-9489 in Apex One
Summary
by MITRE
A directory traversal vulnerability in Trend Micro Apex One, OfficeScan (versions XG and 11.0), and Worry-Free Business Security (versions 10.0, 9.5 and 9.0) could allow an attacker to modify arbitrary files on the affected product's management console.
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Analysis
by VulDB Data Team • 05/26/2020
The directory traversal vulnerability identified as CVE-2019-9489 represents a critical security flaw affecting multiple Trend Micro security products including Apex One, OfficeScan XG and 11.0, and Worry-Free Business Security versions 10.0, 9.5, and 9.0. This vulnerability stems from inadequate input validation within the affected software's management console functionality, specifically in how file paths are processed and validated during administrative operations. The flaw allows unauthorized attackers to manipulate file system access controls and potentially execute arbitrary file modifications on the affected systems. The vulnerability manifests when the software fails to properly sanitize user-supplied input that is used to construct file paths, creating opportunities for attackers to navigate beyond intended directories and access restricted system files. This represents a fundamental breakdown in the principle of least privilege and proper input validation mechanisms that should prevent such unauthorized access patterns.
The technical implementation of this directory traversal flaw enables attackers to exploit the lack of proper path normalization and validation checks within the Trend Micro management console. When administrative functions process user input for file operations, the software does not adequately filter or sanitize special characters such as .. or / that could be used to traverse directory structures. This vulnerability is classified as CWE-22 according to the Common Weakness Enumeration catalog, which specifically addresses improper limitation of a pathname to a restricted directory. Attackers can leverage this weakness to modify critical system files, potentially leading to complete system compromise or denial of service conditions. The vulnerability is particularly dangerous because it targets the management console itself, which typically operates with elevated privileges and has access to sensitive system resources and configurations.
The operational impact of CVE-2019-9489 extends beyond simple file modification capabilities and represents a significant threat to enterprise security infrastructure. Organizations running affected Trend Micro products face potential unauthorized access to critical system components, which could lead to complete system compromise or data exfiltration. The vulnerability's exploitation allows attackers to modify system files that control security policies, update mechanisms, and administrative functions, potentially creating persistent backdoors or disabling security features entirely. This represents a serious concern for enterprise environments where these products are deployed as primary security solutions, as the attack surface includes not only the management console but also the underlying operating systems and network configurations that these products manage. The vulnerability's potential for privilege escalation makes it particularly attractive to sophisticated attackers who may seek to establish long-term access to enterprise networks.
Mitigation strategies for CVE-2019-9489 should prioritize immediate patch application from Trend Micro, as the vendor has released security updates addressing this specific vulnerability. Organizations should also implement network segmentation and access controls to limit exposure of affected management consoles to untrusted networks or users. The implementation of proper input validation and path sanitization measures should be enforced across all administrative interfaces, following secure coding practices that align with the ATT&CK framework's defensive strategies for preventing command injection and path traversal attacks. Additional monitoring should be implemented to detect unusual file modification patterns or access attempts to sensitive system directories. Security teams should conduct thorough vulnerability assessments of their entire Trend Micro product deployments to identify any additional unpatched systems, while also reviewing access controls and administrative privileges to minimize the potential impact of any successful exploitation attempts. Regular security audits and penetration testing should be performed to validate the effectiveness of implemented mitigations and ensure that no other similar vulnerabilities exist within the organization's security infrastructure.