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Date: 7 Jan 2006 08:07:43 -0000
From: frankruder@...mail.com
To: bugtraq@...urityfocus.com
Subject: Microsoft Windows GRE WMF Format Multiple Memory Overrun
 Vulnerabilities


Microsoft Windows GRE WMF Format Multiple Memory Overrun Vulnerabilities

by cocoruder
page:http://ruder.cdut.net
email:frankruder_at_hotmail.com

Last Update:2006.01.07
class:design error
Remote:yes
local:yes

Product Affected:
Microsoft Windows XP SP2
Microsoft Windows XP SP1
Microsoft Windows Server 2003 SP1
Microsoft Windows Server 2003
Microsoft Windows ME
Microsoft Windows 98se
Microsoft Windows 98
Microsoft Windows 2000SP4

Vendor:
www.microsoft.com

Overview:
Microsoft Windows GRE(Graphics Rendering Engine) has been discovered multiple memory overrun vulnerabilities while rendering WMF format file.Users who view the malicious WMF format file will bring a denial of service attack(explorer.exe will be restart).

Details:
there is 2 memory overrun vulnerabilities at least.

1.ExtCreateRegion call result in memory overrun vulnerability
HRGN ExtCreateRegion(
  CONST XFORM *lpXform,     // transformation data
  DWORD nCount,             // size of region data
  CONST RGNDATA *lpRgnData  // region data buffer
);

WMFRECORD structure:
typedef struct _StandardMetaRecord
{
    DWORD Size;          /* Total size of the record in WORDs */
    WORD  Function;      /* Function number (defined in WINDOWS.H) */
    WORD  Parameters[];  /* Parameter values passed to function */
} WMFRECORD;

the Parameters is likely about:
typedef	struct 	_Parameters
{
	char	unknow1[0x0a];
	WORD	All_PointtStruct_Num;	//the total following " PointtStruct" number
	char	unknow2[0x0a];
	char	PointtStruct[];		//first  "PointtStruct"
}Parameters;

"PointtStruct"  structure:
typedef	struct 	_PointtStruct
{
	WORD	PointNum;		//
	WORD	Point[PointNum];	//
	char	unkonow[6];
}PointtStruct;

if we set 0xff to WMFRECORD.Function,PlayMetaFileRecord will compute the memory which will be allocate later,as following:

.text:7F00FE07 loc_7F00FE07:                           ; CODE XREF: PlayMetaFileRecord+1256.j
.text:7F00FE07                 sub     eax, 3
.text:7F00FE0A                 jnz     loc_7F022B9A    ; 0xff
.text:7F00FE10                 movzx   ecx, word ptr [ebx+10h]	;get total "PointtStruct" number
.text:7F00FE14                 mov     [ebp-88h], ecx		;save
.text:7F00FE1A                 test    ecx, ecx
.text:7F00FE1C                 jnz     short loc_7F00FE2E	;jmp 
.text:7F00FE1E                 xor     eax, eax
.text:7F00FE20                 push    eax             ; int
.text:7F00FE21                 push    eax             ; int
.text:7F00FE22                 push    eax             ; int
.text:7F00FE23                 push    eax             ; int
.text:7F00FE24                 call    CreateRectRgn
.text:7F00FE29                 jmp     loc_7F010494
.text:7F00FE2E ; &#21738;&#21738;&#21738;&#21738;&#21738;&#21738;&#21738;&#21738;&#21738;&#21738;&#21738;&#21738;&#21738;&#21738;&#21738;&#21738;&#21738;&#21738;&#21738;&#21738;&#21738;&#21738;&#21738;&#21738;&#21738;&#21738;&#21738;&#21738;&#21738;&#21738;&#21738;&#21738;&#21738;&#21738;&#21738;&#21738;&#21738;?
.text:7F00FE2E
.text:7F00FE2E loc_7F00FE2E:                           ; CODE XREF: PlayMetaFileRecord+C15.j
.text:7F00FE2E                 xor     edi, edi
.text:7F00FE30                 mov     [ebp-8Ch], edi
.text:7F00FE36                 lea     eax, [ebx+1Ch]		;get first "PointtStruct" address
.text:7F00FE39                 mov     [ebp-90h], eax		;save
.text:7F00FE3F                 and     [ebp-94h], edi			
.text:7F00FE45                 and     [ebp-98h], edi
.text:7F00FE4B                 test    ecx, ecx
.text:7F00FE4D                 jbe     short loc_7F00FE8C		
.text:7F00FE4F
.text:7F00FE4F loc_7F00FE4F:                           ; CODE XREF: PlayMetaFileRecord+C83.j
.text:7F00FE4F                 movzx   ecx, word ptr [eax]	;get PointNum,here will trigger memory access error**
.text:7F00FE52                 mov     edx, ecx				
.text:7F00FE54                 shr     edx, 1			;PointNum/2
.text:7F00FE56                 add     edx, edi			;sum PointNum/2
.text:7F00FE58                 cmp     edx, edi
.text:7F00FE5A                 jb      loc_7F0106D5
.text:7F00FE60                 mov     edi, edx
.text:7F00FE62                 mov     [ebp-8Ch], edi
.text:7F00FE68                 cmp     ecx, 7FFFFFFBh
.text:7F00FE6E                 jnb     loc_7F0106D5
.text:7F00FE74                 lea     eax, [eax+ecx*2+8]
.text:7F00FE78                 inc     dword ptr [ebp-98h]	;counter+1
.text:7F00FE7E                 mov     ecx, [ebp-98h]
.text:7F00FE84                 cmp     ecx, [ebp-88h]		;cmp total "PointtStruct" number
.text:7F00FE8A                 jb      short loc_7F00FE4F	;traverse all "PointtStruct"
.text:7F00FE8C
.text:7F00FE8C loc_7F00FE8C:                           		; CODE XREF: PlayMetaFileRecord+C46.j
.text:7F00FE8C                                         		; PlayMetaFileRecord+14D8.j
.text:7F00FE8C                 cmp     dword ptr [ebp-94h], 0
.text:7F00FE93                 jnz     loc_7F022BA2
.text:7F00FE99                 cmp     edi, 0FFFFFFDh
.text:7F00FE9F                 jnb     loc_7F022BA2
.text:7F00FEA5                 mov     eax, [ebp-8Ch]
.text:7F00FEAB                 add     eax, 2
.text:7F00FEAE                 shl     eax, 4
.text:7F00FEB1                 mov     [ebp-9Ch], eax
.text:7F00FEB7                 push    eax             ; uBytes
.text:7F00FEB8                 push    0               ; uFlags
.text:7F00FEBA                 call    ds:LocalAlloc		;will allocate memory normally.
.text:7F00FEC0                 mov     edi, eax

so when we set "Parameters.All_PointtStruct_Num","PointtStruct.PointNum" big enough,but not many enough "PointtStruct" structure,will trigger a memory access error on 7F00FE4F.


2.ExtEscape POSTSCRIPT_INJECTION result in memory overrun vulnerability
int ExtEscape(
  hdc,                  // handle to DC (HDC)
  POSTSCRIPT_INJECTION, // nEscape param of ExtEscape
  cbInput,              // size of input buffer
  lpszInData,           // pointer to input (PSINJECTDATA *)
  0,                    // cbOutput param of ExtEscape
  NULL                  // lpszOutData param of ExtEscape
);

we can control cbInput and szInData,so when we set cbInput big enough(like 0xffff),but set szInData very small,will trigger a memory access error(7F027358) likely.

.text:7F027312 loc_7F027312:                           ; CODE XREF: ExtEscape+11E.j
.text:7F027312                                         ; ExtEscape+12A.j
.text:7F027312                 test    byte ptr [ecx+4], 40h
.text:7F027316                 jnz     loc_7F017CEC
.text:7F02731C                 mov     ebx, [ebp+arg_8]		;we can cotrol this:cbSize
.text:7F02731F                 add     ebx, 1Ah			;cbSize+0x1a
.text:7F027322                 and     ebx, 0FFFFFFFCh		;cbSize+0x1a-4
.text:7F027325                 mov     eax, large fs:18h
.text:7F02732B                 mov     eax, [eax+30h]
.text:7F02732E                 push    ebx
.text:7F02732F                 push    0
.text:7F027331                 push    dword ptr [eax+18h]
.text:7F027334                 call    ds:RtlAllocateHeap	;allocate memory size=cbSize+0x16
.text:7F02733A                 test    eax, eax
.text:7F02733C                 jz      short loc_7F027385
.text:7F02733E                 mov     ecx, [ebp+arg_4]
.text:7F027341                 mov     [eax+0Ch], ecx
.text:7F027344                 mov     ecx, [ebp+arg_8]
.text:7F027347                 mov     [eax+10h], ecx
.text:7F02734A                 mov     edx, ecx
.text:7F02734C                 shr     ecx, 2
.text:7F02734F                 sub     ebx, 8
.text:7F027352                 mov     [eax+8], ebx
.text:7F027355                 lea     edi, [eax+14h]
.text:7F027358                 rep movsd			;copy,here will trigger a memory error likely**
.text:7F02735A                 mov     ecx, edx
.text:7F02735C                 and     ecx, 3
.text:7F02735F                 rep movsb
.text:7F027361                 mov     ecx, [ebp-4]
.text:7F027364                 mov     edi, [ebp+arg_14]
.text:7F027367                 lea     edx, [ecx+48h]
.text:7F02736A                 mov     esi, [edx+4]
.text:7F02736D                 mov     [eax+4], esi

Exploit:
first vul can test like this:
  ...05020000FF0044444444444444444444FFFF33333333333333333333FFFF41424344...
second vul can test like this:
  ...0502000026001610FFFF4444444444444444...
my blog can not be opened now:p,i will upload the exploit files to xfocus(www.xfocus.net) later,have fun:)

Solution:
Microsoft has not develop the patch,please unregister the Windows Picture and Fax Viewer (Shimgvw.dll)(see MS06-001).

Thanks:
thanks all my friends,Happy Weekday:)

-EOF-


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