CVE-2023-2685 in AO-OPC
Summary
by MITRE • 07/28/2023
A vulnerability was found in AO-OPC server versions mentioned above. As the directory information for the service entry is not enclosed in quotation marks, potential attackers could possibly call up another application than the AO-OPC server by starting the service. The service might be started with system user privileges which could cause a shift in user access privileges.
It is unlikely to exploit the vulnerability in well maintained Windows installations since the attacker would need write access to system folders.
An update is available that resolves the vulnerability found during an internal review in the product AO-OPC = 3.2.1
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Analysis
by VulDB Data Team • 08/23/2023
The vulnerability identified as CVE-2023-2685 resides within AO-OPC server implementations and represents a path traversal or command injection weakness that stems from improper handling of service directory paths. This flaw manifests when directory information for service entries lacks quotation marks during execution, creating an exploitable condition where malicious actors could potentially invoke unintended applications instead of the intended AO-OPC server process. The vulnerability operates at the system level where service execution can occur with elevated privileges, specifically system user rights, which creates a significant security risk when exploited. The absence of proper path quoting allows for arbitrary code execution through service manipulation, particularly when the service is configured to run with administrative privileges. This type of vulnerability aligns with CWE-78 and CWE-88 categories, which specifically address issues related to command injection and improper handling of shell metacharacters. The attack vector leverages the Windows service management mechanism where unquoted service paths can be manipulated to execute malicious binaries placed in the path hierarchy. This vulnerability directly maps to ATT&CK technique T1543.003 for creating or modifying system-level service configurations and T1068 for local privilege escalation through service manipulation.
The operational impact of this vulnerability extends beyond simple service misconfiguration to encompass potential privilege escalation and system compromise scenarios. When services execute with system-level privileges, successful exploitation can result in complete system takeover, allowing attackers to establish persistent access, escalate privileges further, or deploy additional malicious payloads. The vulnerability is particularly concerning because it can be exploited through service manipulation rather than requiring direct user interaction or complex attack chains. Attackers who can influence service startup parameters or have access to write permissions in service directories can leverage this weakness to execute arbitrary code with elevated privileges. The security implications become more severe in environments where service accounts have broader permissions or where multiple services are running with system-level privileges, creating a potential attack surface that could be exploited for lateral movement within the network. The vulnerability's exploitation requires minimal technical sophistication compared to other privilege escalation techniques, making it attractive to threat actors seeking to establish persistent access.
Mitigation strategies for CVE-2023-2685 should focus on immediate patch application as the primary defense mechanism, with the vendor releasing AO-OPC server version 3.2.1 to resolve the issue. Organizations must ensure all instances of the affected software are updated to prevent exploitation. Additional mitigations include implementing proper service path quoting practices, where all service executable paths are enclosed in double quotation marks to prevent path manipulation. System administrators should conduct thorough audits of service configurations to identify any unquoted paths and remediate them immediately. The principle of least privilege should be enforced by ensuring services run with minimal required permissions rather than system-level privileges whenever possible. Network segmentation and access controls should be implemented to limit write access to system directories and service configuration files. Security monitoring should be enhanced to detect unusual service startup patterns or attempts to modify service configurations. Regular vulnerability assessments should include checking for unquoted service paths as part of standard security auditing procedures. The updated AO-OPC server version 3.2.1 specifically addresses the path quoting issue through internal code modifications that ensure directory information is properly enclosed in quotation marks during service execution, preventing the injection of unintended applications. Organizations should also consider implementing application whitelisting solutions to prevent execution of unauthorized binaries that could be used in exploitation attempts. Proper service account management and regular security assessments of service configurations will help maintain a secure environment against this class of vulnerability.