CVE-2020-8599 in Apex One
Summary
by MITRE
Trend Micro Apex One (2019) and OfficeScan XG server contain a vulnerable EXE file that could allow a remote attacker to write arbitrary data to an arbitrary path on affected installations and bypass ROOT login. Authentication is not required to exploit this vulnerability.
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Analysis
by VulDB Data Team • 02/06/2025
The vulnerability identified as CVE-2020-8599 affects Trend Micro Apex One version 2019 and OfficeScan XG server installations, representing a critical security flaw that enables remote code execution through manipulation of a vulnerable executable file. This vulnerability stems from insufficient input validation and improper access controls within the software's installation and update mechanisms, creating a pathway for attackers to gain unauthorized system access. The flaw specifically resides in how the system handles certain executable files during the installation process, allowing malicious actors to inject arbitrary data into targeted system locations.
The technical implementation of this vulnerability involves the exploitation of a weakly protected executable file that accepts unvalidated input parameters. Attackers can leverage this weakness to write malicious data to arbitrary file paths within the system, effectively bypassing the need for legitimate administrative credentials or root login privileges. This represents a fundamental breakdown in the software's security model where the authentication requirements are circumvented through direct manipulation of the file system. The vulnerability operates at the system level rather than requiring user interaction, making it particularly dangerous as it can be exploited without any user involvement or explicit authentication attempts.
The operational impact of CVE-2020-8599 extends beyond simple privilege escalation, as it provides attackers with persistent access to affected systems and potentially enables lateral movement within network environments. The vulnerability's remote exploitability means that attackers can target systems from outside the network perimeter without requiring physical access or prior authentication credentials. This characteristic aligns with attack patterns documented in the mitre attack framework under techniques such as remote service exploitation and privilege escalation. The lack of authentication requirements makes this vulnerability particularly dangerous for enterprise environments where Trend Micro products are commonly deployed as security solutions, potentially creating a false sense of security while simultaneously providing attackers with a backdoor into protected networks.
Organizations affected by this vulnerability should immediately implement mitigations including patching the vulnerable software to the latest versions released by Trend Micro, which address the input validation issues and strengthen access controls. Network segmentation and monitoring should be enhanced to detect anomalous file system modifications that might indicate exploitation attempts. Security teams should also implement privileged access management controls and regularly audit system files for unauthorized modifications. The vulnerability demonstrates the importance of proper input validation and access control mechanisms, aligning with common weakness enumerations under CWE-20 for improper input validation and CWE-284 for improper access control. Additionally, organizations should consider implementing network-based intrusion detection systems that can identify suspicious file write operations to critical system paths, as this represents a common attack vector for persistent threats seeking to establish footholds within enterprise environments.