SugarCRM 6.5.18 Cross Site Scripting

SugarCRM version 6.5.18 suffers from a persistent cross site scripting vulnerability.

MD5 | 174b1efde3e13dda0e63a200ae2c6980

Document Title:
SugarCRM v6.5.18 - (Employees) Persistent Cross Site Vulnerability

References (Source):

Release Date:

Vulnerability Laboratory ID (VL-ID):

Common Vulnerability Scoring System:

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: )

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

Affected Product(s):
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:

Exploitation Technique:

Severity Level:

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
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
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

PoC: Payload

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"
<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
</td><td>&nbsp;</td><td class="schedulerSlotCellStartTime"
style="background-color: rgb(77, 94, 170);">&nbsp;</td><td
</td><td>&nbsp;</td><td class="schedulerAttendeeDeleteCell" nowrap="">
<a title="rem" class="listViewTdToolsS1" style="text-decoration:none;"
alt="rem" border="0" align="absmiddle"> rem</a>

--- PoC Session Logs [POST] ---
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-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
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,
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=/;
ck_login_language_20=en_us; Max-Age=7776000; path=/;
sugar_user_theme=Sugar5; Max-Age=31536000
X-Powered-By: ASP.NET
Content-Length: 184


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 -
Benjamin Kunz Mejri -

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