CVE-2025-4539 in ToDesk
Summary
by MITRE • 05/11/2025
A vulnerability was found in Hainan ToDesk 4.7.6.3. It has been declared as critical. This vulnerability affects unknown code in the library profapi.dll of the component DLL File Parser. The manipulation leads to uncontrolled search path. It is possible to launch the attack on the local host. The complexity of an attack is rather high. The exploitation appears to be difficult. The exploit has been disclosed to the public and may be used. The vendor was contacted early about this disclosure but did not respond in any way.
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Analysis
by VulDB Data Team • 05/11/2025
The vulnerability identified as CVE-2025-4539 represents a critical security flaw in Hainan ToDesk version 4.7.6.3 that resides within the profapi.dll library component of the DLL File Parser module. This issue manifests as an uncontrolled search path vulnerability that creates a dangerous condition where the system may inadvertently execute malicious code from unintended locations. The vulnerability's classification as critical indicates the potential for severe impact on system security and confidentiality, particularly given that the flaw exists within a core system library that handles dynamic link library processing. The attack vector is specifically local host based, meaning that exploitation requires physical access or remote code execution capabilities on the target system, which significantly limits but does not eliminate the threat surface.
The technical implementation of this vulnerability stems from improper handling of the search path mechanism within the profapi.dll library, which allows for path manipulation attacks that can lead to arbitrary code execution. This flaw directly correlates to CWE-428, which describes the condition where a program or system fails to properly validate or control the search path used to locate libraries or executables. The complexity of exploitation is noted as high, requiring sophisticated techniques that may involve crafting specific DLL files or manipulating system paths to achieve successful compromise. The difficulty level suggests that while the attack is not trivial, it is sufficiently accessible to be weaponized by determined threat actors who have the capability to develop and deploy appropriate exploit code.
The operational impact of this vulnerability extends beyond simple privilege escalation or code execution, as it represents a fundamental weakness in how the system handles dynamic library loading and path resolution. Attackers who successfully exploit this vulnerability can potentially execute malicious code with the privileges of the affected application, which may include system-level access depending on how ToDesk is configured. The fact that the exploit has been publicly disclosed and is potentially in use by threat actors significantly increases the risk profile, as organizations may be unknowingly targeted by automated scanning tools or targeted attacks that specifically seek out this vulnerability. The lack of vendor response to early disclosure efforts creates additional concern, as it suggests either limited resources for addressing the issue or an acknowledgment that the vulnerability may be difficult to patch without disrupting core functionality.
Organizations should implement immediate mitigations including network segmentation to limit local access to systems running ToDesk, disabling unnecessary features that may trigger the vulnerable code path, and monitoring for unusual file creation or modification patterns that could indicate exploitation attempts. The ATT&CK framework classification would likely involve techniques such as T1059 for command and scripting interpreter and T1574 for hijacking execution flow, which are common patterns associated with DLL search order hijacking vulnerabilities. System administrators should also consider implementing application control policies that restrict loading of unsigned or untrusted DLL files, and conduct thorough vulnerability assessments to identify systems that may be running affected versions of the software. Regular security updates and patches should be prioritized, though the vendor's lack of response suggests that organizations may need to implement workarounds or alternative security controls until a proper fix is available.