Document Title:  
VTiger v7.0 CRM - (To) Persistent Email 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:  
Vtiger CRM is web-application built using PHP. Choose the best CRM for  
your business. Custom Module & Relationship builder for  
VTiger is a very useful extension that allows crm administrators to  
create custom modules within few clicks. All custom modules  
are created following strict VTiger standards. In addition, the  
relationship builder allows crm admin to link together existing modules  
as well as new custom modules.  
(Copy of the Homepage: )  
Abstract Advisory Information:  
The vulnerability laboratory core research team discovered a persistent  
cross site vulnerability in the VTiger v7.0 CRM open-source web-application.  
Affected Product(s):  
Product: VTiger v7.0 - CRM (Web-Application)  
Vulnerability Disclosure Timeline:  
2020-04-27: Public Disclosure (Vulnerability Laboratory)  
2020-04-28: Researcher Notification & Coordination (Security Researcher)  
2020-04-29: Vendor Notification 1 (Security Department)  
2020-05-30: Vendor Notification 2 (Security Department)  
2020-06-22: Vendor Notification 3 (Security Department)  
****-**-**: Vendor Response/Feedback (Security Department)  
****-**-**: Vendor Fix/Patch (Service Developer Team)  
****-**-**: Security Acknowledgements (Security Department)  
2020-11-18: 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 VTiger v7.0 CRM open-source 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 cross site scripting web vulnerability is located in the  
`searchValue` Parameter of the `Emails Compose` module.  
Attackers are able to inject own mlicious script code in the `To` sender  
input field of the email compose module to attack other  
user accounts. The email can be delivered with multiple receipients  
which allows an attacker to insert the target email and a  
malicious payload. The request method to inject is GET via searchValue  
and POST on compose with persistent attack vector.  
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  
[+] GET  
Vulnerable Module(s):  
[+] Email Compose (index.php?module=Emails)  
Vulnerable Input(s):  
[+] To (Sender - Email)  
Proof of Concept (PoC):  
The persistent input validation web vulnerability can be exploited by  
remote attackers with low privileged account and with low user interaction.  
For security demonstration or to reproduce the cross site web  
vulnerability follow the provided information and steps below to continue.  
PoC: Url  
Manual steps to reproduce the vulnerability ...  
1. Open the web-application ui  
2. Login with a regular user role to the ui  
3. Open vendors and move to compose to email form  
4. Inject malicious payload as "to" sender information and as well a  
valid email to target  
5. Send the request after the compose  
6. Wait until the administrator or higher privileged targeted users  
click in the email or receives the email on preview  
7. Successful reproduce of the cross site scripting web vulnerability!  
PoC: Vulnerable Source (Execution Point)  
<div class="col-lg-12"><div class="col-lg-2"><span  
class="pull-right">To&nbsp;<span class="redColor">*</span></span></div>  
<div class="col-lg-6"><div class="select2-container  
select2-container-multi autoComplete sourceField select2"  
id="s2id_emailField" style="width: 100%;"><ul class="select2-choices  
ui-sortable"> <li class="select2-search-choice">  
<div>IT <b>(</b></div> <a href="#"  
class="select2-search-choice-close" tabindex="-1"></a></li>  
<li class="select2-search-choice"><div><iframe src"evil.source"  
--- PoC Session Logs [GET] ---  
Host: localhost:8080  
Accept: application/json, text/javascript, */*; q=0.01  
X-Requested-With: XMLHttpRequest  
Connection: keep-alive  
Cookie: PHPSESSID=ni2357om9nni5vvhovf20rkt51  
GET: HTTP/1.1 200 OK  
Server: Apache/2.4.10 (Debian)  
Content-Length: 28  
Keep-Alive: timeout=5, max=100  
Connection: Keep-Alive  
Content-Type: text/json; charset=UTF-8  
Host: localhost:8080  
Connection: keep-alive  
Cookie: PHPSESSID=ni2357om9nni5vvhovf20rkt51  
GET: HTTP/1.1 200 OK  
Server: Apache/2.4.10  
Content-Length: 299  
Keep-Alive: timeout=5, max=99  
Connection: Keep-Alive  
Content-Type: text/html; charset=iso-8859-1  
Security Risk:  
The security risk of the persistent web vulnerability i the  
web-application is estimated as medium.  
Credits & Authors:  
Vulnerability-Lab -  
Benjamin Kunz Mejri -  
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.  
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]™