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Windows: Enhance protection against dll hijacking attacks following new report by Stefan Kanthak.

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Mounir IDRASSI 2016-07-26 00:49:19 +02:00
parent 3aaf5c7045
commit a7f1ba05b4
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GPG Key ID: DD0C382D5FCFB8FC
1 changed files with 27 additions and 2 deletions
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29
src/Common/Dlgcode.c
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@ -239,6 +239,18 @@ HMODULE hwinscarddll = NULL;
#define FREE_DLL(h) if (h) { FreeLibrary (h); h = NULL;}
#ifndef BASE_SEARCH_PATH_ENABLE_SAFE_SEARCHMODE
#define BASE_SEARCH_PATH_ENABLE_SAFE_SEARCHMODE 0x00000001
#endif
#ifndef BASE_SEARCH_PATH_PERMANENT
#define BASE_SEARCH_PATH_PERMANENT 0x00008000
#endif
typedef BOOL (WINAPI *SetDllDirectoryPtr)(LPCWSTR lpPathName);
typedef BOOL (WINAPI *SetSearchPathModePtr)(DWORD Flags);
typedef void (WINAPI *InitCommonControlsPtr)(void);
typedef HIMAGELIST (WINAPI *ImageList_CreatePtr)(int cx, int cy, UINT flags, int cInitial, int cGrow);
typedef int (WINAPI *ImageList_AddPtr)(HIMAGELIST himl, HBITMAP hbmImage, HBITMAP hbmMask);
@ -255,6 +267,9 @@ typedef HRESULT (STDAPICALLTYPE *SHStrDupWPtr)(LPCWSTR psz, LPWSTR *ppwsz);
// ChangeWindowMessageFilter
typedef BOOL (WINAPI *ChangeWindowMessageFilterPtr) (UINT, DWORD);
SetDllDirectoryPtr SetDllDirectoryFn = NULL;
SetSearchPathModePtr SetSearchPathModeFn = NULL;
ImageList_CreatePtr ImageList_CreateFn = NULL;
ImageList_AddPtr ImageList_AddFn = NULL;
@ -2547,6 +2562,15 @@ void InitApp (HINSTANCE hInstance, wchar_t *lpszCommandLine)
char langId[6];
InitCommonControlsPtr InitCommonControlsFn = NULL;
/* remove current directory from dll search path */
SetDllDirectoryFn = (SetDllDirectoryPtr) GetProcAddress (GetModuleHandle(L"kernel32.dll"), "SetDllDirectoryW");
SetSearchPathModeFn = (SetSearchPathModePtr) GetProcAddress (GetModuleHandle(L"kernel32.dll"), "SetSearchPathMode");
if (SetDllDirectoryFn)
SetDllDirectoryFn (L"");
if (SetSearchPathModeFn)
SetSearchPathModeFn (BASE_SEARCH_PATH_ENABLE_SAFE_SEARCHMODE | BASE_SEARCH_PATH_PERMANENT);
InitOSVersionInfo();
VirtualLock (&CmdTokenPin, sizeof (CmdTokenPin));
@ -2597,9 +2621,10 @@ void InitApp (HINSTANCE hInstance, wchar_t *lpszCommandLine)
if (IsOSAtLeast (WIN_VISTA))
{
LoadSystemDll (L"spp.dll", &hsppdll, TRUE, SRC_POS);
LoadSystemDll (L"vssapi.dll", &vssapidll, TRUE, SRC_POS);
LoadSystemDll (L"atl.dll", &hsppdll, TRUE, SRC_POS);
LoadSystemDll (L"vsstrace.dll", &hvsstracedll, TRUE, SRC_POS);
LoadSystemDll (L"vssapi.dll", &vssapidll, TRUE, SRC_POS);
LoadSystemDll (L"spp.dll", &hsppdll, TRUE, SRC_POS);
if (IsOSAtLeast (WIN_7))
{