CVE-2026-41447 in FirmaCheck
Summary
by MITRE • 08/03/2026
FirmaCheck for Windows before 1.3.16 contains a dll hijacking vulnerability that allows local attackers to execute arbitrary code by placing a crafted openssl.cnf file in the unvalidated C:\Program Files (x86)\Common Files\SSL\ directory path. Attackers can write a malicious OpenSSL configuration file referencing an attacker-controlled DLL to achieve code execution at startup process privilege level when FirmaCheck.exe runs automatically at system startup.
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Analysis
by VulDB Data Team • 08/04/2026
This vulnerability represents a classic dynamic link library hijacking scenario that exploits insecure library loading practices within the FirmaCheck Windows application. The flaw exists in the application's handling of OpenSSL configuration files, specifically when the software attempts to load the openssl.cnf file from the C:\Program Files (x86)\Common Files\SSL\ directory path without proper validation of the file source or location. This directory path is commonly used by various applications and system components, creating an attack surface where malicious actors can place crafted configuration files that will be processed by the vulnerable application during startup operations.
The technical execution of this vulnerability relies on the principle that Windows applications often search for configuration files in predictable locations and load libraries from these paths without sufficient security checks. When FirmaCheck.exe runs automatically at system startup, it processes the openssl.cnf file which contains directives for OpenSSL library initialization. An attacker can craft a malicious configuration file that includes references to a specially named DLL file located in the same directory, causing the application to load and execute arbitrary code with the privileges of the user running FirmaCheck.exe. This represents a privilege escalation vulnerability that operates at the system startup level, potentially allowing attackers to gain elevated access to the compromised system.
The operational impact of this vulnerability extends beyond simple code execution as it provides a persistent foothold within the target environment. Since FirmaCheck.exe runs automatically at system startup, the attacker maintains access even after system reboots, making this a particularly dangerous vulnerability for maintaining long-term presence on compromised systems. The attack requires local system access to place the malicious configuration file but does not require elevated privileges beyond what the user already possesses. This makes the vulnerability exploitable in scenarios where an attacker has gained limited user-level access through other means such as phishing attacks or social engineering.
From a cybersecurity perspective, this vulnerability aligns with CWE-426 Untrusted Search Path and ATT&CK technique T1059 Command and Scripting Interpreter, specifically focusing on the execution of malicious code through configuration file manipulation. The vulnerability demonstrates poor security practices in library loading mechanisms and highlights the importance of validating all input sources and implementing proper privilege separation. Organizations should immediately update to FirmaCheck version 1.3.16 or later where this vulnerability has been patched, while also implementing monitoring for unusual file creation patterns in system directories and conducting security audits of third-party applications that may exhibit similar insecure loading behaviors.
The mitigation strategy involves both immediate remediation through software updates and longer-term security hardening measures including regular application patching, implementation of privileged access management controls, and enhanced monitoring of system startup processes. System administrators should also consider implementing file integrity monitoring solutions to detect unauthorized modifications to critical directories and configuration files. Additionally, the principle of least privilege should be enforced by ensuring that applications run with minimal required permissions and that automatic startup processes are regularly audited for security compliance.
This vulnerability type specifically relates to the broader class of insecure library loading issues that have been documented in numerous security advisories over the years, representing a fundamental security flaw in how applications handle dynamic libraries and configuration files. The risk assessment should consider not only the immediate code execution capability but also the potential for further privilege escalation attacks once initial access is established, particularly given that the vulnerability operates at system startup level where elevated privileges may be available.