CVE-2025-10541 in EAM
Summary
by MITRE • 09/25/2025
iMonitor EAM 9.6394 installs a system service (eamusbsrv64.exe) that runs with NT AUTHORITY\SYSTEM privileges. This service includes an insecure update mechanism that automatically loads files placed in the C:\sysupdate\ directory during startup. Because any local user can create and write to this directory, an attacker can place malicious DLLs or executables in it. Upon service restart, the files are moved to the application’s installation path and executed with SYSTEM privileges, leading to privilege escalation.
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Analysis
by VulDB Data Team • 09/25/2025
The vulnerability described in CVE-2025-10541 represents a critical privilege escalation flaw within iMonitor EAM version 9.6394 that stems from improper privilege management and insecure update mechanisms. This vulnerability specifically targets the eamusbsrv64.exe system service which operates with elevated NT AUTHORITY\SYSTEM privileges, creating a dangerous attack surface where local users can manipulate the service's behavior through directory manipulation. The service's design includes an automatic update mechanism that monitors the C:\sysupdate\ directory for files to load during startup, establishing a clear path for malicious code execution with system-level privileges.
The technical flaw manifests through a combination of weak directory permissions and insecure file loading practices that violate fundamental security principles. The C:\sysupdate\ directory is created with insufficient access controls, allowing any local user account to write files to this location. This design flaw directly maps to CWE-276, which addresses improper privileges for system resources, and CWE-73, which covers improper control of generation of code. The service's automatic loading mechanism executes files from this directory without proper validation or integrity checks, creating a classic path traversal and code injection vulnerability. The service operates with SYSTEM privileges, making this a critical escalation of privilege vulnerability that can be exploited by any local user without requiring additional authentication.
The operational impact of this vulnerability is severe as it enables local users to achieve system-level compromise through relatively simple file manipulation techniques. Attackers can place malicious DLLs or executables in the sysupdate directory, which are then automatically executed with SYSTEM privileges during service restart operations. This creates a persistent backdoor mechanism that can be used for privilege escalation, persistence, and lateral movement within the compromised system. The vulnerability's exploitation requires minimal technical skill and provides maximum impact, making it particularly dangerous in environments where local user accounts are prevalent. The attack vector aligns with ATT&CK technique T1068, which covers local privilege escalation through service execution, and T1543, which addresses persistence through service creation or modification.
Mitigation strategies should focus on immediate privilege restrictions and architectural improvements to prevent the insecure update mechanism from executing arbitrary code. The most effective immediate fix involves implementing proper directory permissions on C:\sysupdate\ to restrict write access to only the service account or system administrators. Additionally, the service should be configured to perform file integrity checks before executing any loaded components, implementing digital signatures verification or hash validation. The application should be updated to remove or disable the automatic update mechanism that relies on user-writable directories, as this design pattern inherently violates security best practices. System administrators should also implement monitoring for unauthorized file creation in the sysupdate directory and establish regular audits to detect potential exploitation attempts. Organizations should consider implementing application whitelisting policies to prevent execution of unauthorized binaries, and the service should be configured to run with the minimum required privileges rather than SYSTEM level access. These remediations align with security frameworks that emphasize principle of least privilege and secure coding practices to prevent similar vulnerabilities in future implementations.