WooYun.org

windows的MAX_PATH是260，也就是259字节加一个\0，但是事实上windows的长文件名是可以超过259字节的。只不过应用时，一般把它作为短文件名看待，所以还姑且在259之内。
但是这里office展开文件属性时，获取了文件的长文件名，但是却没有使用安全的拷贝函数或者采用足够长的缓冲区，导致缓冲区溢出。

永中使用jvm，而它的入口点因此是固定的：
0:021> lmvm yozo_office
start end module name
00400000 00479000 Yozo_Office (deferred)
Image path: E:\Program Files (x86)\Yozosoft\Yozo_Personal\Yozo_Office.exe
Image name: Yozo_Office.exe
Timestamp: Mon Jan 09 15:32:53 2012 (4F0A9825)
CheckSum: 0007A0E1
ImageSize: 00079000
File version: 6.0.0.0
Product version: 6.0.0.0
File flags: 0 (Mask 3F)
File OS: 40004 NT Win32
File type: 1.0 App
File date: 00000000.00000000
Translations: 0000.04b0
CompanyName: YOZOSOFT CO., LTD.
ProductName: Yozo Office
InternalName: Yozo Office
OriginalFilename: Yozo_Office.exe
ProductVersion: 6.0
FileVersion: 6.0.0.0
PrivateBuild: 6.0.0.0
SpecialBuild: 6.0.0.0
FileDescription: Yozo Office
LegalCopyright: Copyright (C) 2010-2012 YOZOSOFT CO., LTD. All rights reserved.
LegalTrademarks: Copyright (C) 2010-2012 YOZOSOFT CO., LTD. All rights reserved.
Comments: Copyright (C) 2010-2012 YOZOSOFT CO., LTD. All rights reserved.
程序内实现了MessageBoxA
int __cdecl __crtMessageBoxA(int a1, int a2, int a3)
{
int v3;
HMODULE hUser32;
v3 = 0;
if ( !__MessageBoxA )
{
hUser32 = LoadLibraryA("user32.dll");
if ( !hUser32
|| (__MessageBoxA = (int (__stdcall *)(_DWORD, _DWORD, _DWORD, _DWORD))GetProcAddress(v4, "MessageBoxA")) == 0 )
return 0;
dword_410B00 = GetProcAddress(hUser32, "GetActiveWindow");
dword_410B04 = (int (__stdcall *)(_DWORD))GetProcAddress(hUser32, "GetLastActivePopup");
}
if ( dword_410B00 )
{
v3 = dword_410B00();
if ( v3 )
{
if ( dword_410B04 )
v3 = dword_410B04(v3);
}
}
return __MessageBoxA(v3, a1, a2, a3);
}
具体是在
.text:0040AA3E push offset aMessageboxa ; "MessageBoxA"
.text:0040AA43 push edi ; hModule
.text:0040AA44 call esi ; GetProcAddress
.text:0040AA46 test eax, eax
.text:0040AA48 mov dword_410AFC, eax
....
.text:0040AA88 loc_40AA88: ; CODE XREF: ___crtMessageBoxA+56j
.text:0040AA88 ; ___crtMessageBoxA+5Ej ...
.text:0040AA88 push [esp+0Ch+arg_8] ; _DWORD
.text:0040AA8C push [esp+10h+arg_4] ; _DWORD
.text:0040AA90 push [esp+14h+arg_0] ; _DWORD
.text:0040AA94 push ebx ; _DWORD
.text:0040AA95 call dword_410AFC
可以知道EP+AA95是MessageBox的Call，那么如何在栈上写入0040aa95 (0x95aa4000)呢？0x95和0xaa、0x40都好说，00看来只能靠结尾补零了。改完名之后，拖进word，重复之前操作，最终，确实是进去了，
0:019> r
eax=ffffff00 ebx=29588170 ecx=77d638aa edx=002a017c esi=29588170 edi=0562a000
eip=7771fd1e esp=06d5ff5c ebp=ee414141 iopl=0 nv up ei pl zr na pe nc
cs=0023 ss=002b ds=002b es=002b fs=0053 gs=002b efl=00000246
USER32!MessageBoxA:
7771fd1e 8bff mov edi,edi
只不过弹出来的东西乱七八糟的，我也不费心去弄了，改文件名太麻烦，我这里是使用的c++程序生成，有想试验的也可以试一试。
poc
http://pan.baidu.com/s/1bnpjjkV